def sarraw(cfg_file, output_file, ocean_file, reuse_ocean_file, errors_file,
reuse_errors_file):
###################
# INITIALIZATIONS #
###################
## MPI SETUP
comm = MPI.COMM_WORLD
size, rank = comm.Get_size(), comm.Get_rank()
## WELCOME
if rank == 0:
print(
'-------------------------------------------------------------------'
)
print((time.strftime("- OCEANSAR SAR RAW GENERATOR: %Y-%m-%d %H:%M:%S",
time.localtime())))
print('- Copyright (c) Gerard Marull Paretas, Paco Lopez Dekker')
print(
'-------------------------------------------------------------------'
)
## CONFIGURATION FILE
# Note: variables are 'copied' to reduce code verbosity
cfg = tpio.ConfigFile(cfg_file)
# RAW
wh_tol = cfg.srg.wh_tol
nesz = cfg.srg.nesz
use_hmtf = cfg.srg.use_hmtf
scat_spec_enable = cfg.srg.scat_spec_enable
scat_spec_mode = cfg.srg.scat_spec_mode
scat_bragg_enable = cfg.srg.scat_bragg_enable
scat_bragg_model = cfg.srg.scat_bragg_model
scat_bragg_d = cfg.srg.scat_bragg_d
scat_bragg_spec = cfg.srg.scat_bragg_spec
scat_bragg_spread = cfg.srg.scat_bragg_spread
# SAR
inc_angle = np.deg2rad(cfg.sar.inc_angle)
f0 = cfg.sar.f0
pol = cfg.sar.pol
if pol == 'DP':
do_hh = True
do_vv = True
elif pol == 'hh':
do_hh = True
do_vv = False
else:
do_hh = False
do_vv = True
prf = cfg.sar.prf
num_ch = int(cfg.sar.num_ch)
ant_L = cfg.sar.ant_L
alt = cfg.sar.alt
v_ground = cfg.sar.v_ground
rg_bw = cfg.sar.rg_bw
over_fs = cfg.sar.over_fs
sigma_n_tx = cfg.sar.sigma_n_tx
phase_n_tx = np.deg2rad(cfg.sar.phase_n_tx)
sigma_beta_tx = cfg.sar.sigma_beta_tx
phase_beta_tx = np.deg2rad(cfg.sar.phase_beta_tx)
sigma_n_rx = cfg.sar.sigma_n_rx
phase_n_rx = np.deg2rad(cfg.sar.phase_n_rx)
sigma_beta_rx = cfg.sar.sigma_beta_rx
phase_beta_rx = np.deg2rad(cfg.sar.phase_beta_rx)
# OCEAN / OTHERS
ocean_dt = cfg.ocean.dt
add_point_target = False
use_numba = True
n_sinc_samples = 8
sinc_ovs = 20
chan_sinc_vec = raw.calc_sinc_vec(n_sinc_samples, sinc_ovs, Fs=over_fs)
# OCEAN SURFACE
if rank == 0:
print('Initializing ocean surface...')
surface_full = OceanSurface()
# Setup compute values
compute = ['D', 'Diff', 'Diff2']
if use_hmtf:
compute.append('hMTF')
# Try to reuse initialized surface
if reuse_ocean_file:
try:
surface_full.load(ocean_file, compute)
except RuntimeError:
pass
if (not reuse_ocean_file) or (not surface_full.initialized):
surface_full.init(cfg.ocean.Lx,
cfg.ocean.Ly,
cfg.ocean.dx,
cfg.ocean.dy,
cfg.ocean.cutoff_wl,
cfg.ocean.spec_model,
cfg.ocean.spread_model,
np.deg2rad(cfg.ocean.wind_dir),
cfg.ocean.wind_fetch,
cfg.ocean.wind_U,
cfg.ocean.current_mag,
np.deg2rad(cfg.ocean.current_dir),
cfg.ocean.swell_enable,
cfg.ocean.swell_ampl,
np.deg2rad(cfg.ocean.swell_dir),
cfg.ocean.swell_wl,
compute,
cfg.ocean.opt_res,
cfg.ocean.fft_max_prime,
choppy_enable=cfg.ocean.choppy_enable)
surface_full.save(ocean_file)
else:
surface_full = None
# Initialize surface balancer
surface = OceanSurfaceBalancer(surface_full, ocean_dt)
# CALCULATE PARAMETERS
if rank == 0:
print('Initializing simulation parameters...')
# SR/GR/INC Matrixes
sr0 = geosar.inc_to_sr(inc_angle, alt)
gr0 = geosar.inc_to_gr(inc_angle, alt)
gr = surface.x + gr0
sr, inc, _ = geosar.gr_to_geo(gr, alt)
sr -= np.min(sr)
#inc = np.repeat(inc[np.newaxis, :], surface.Ny, axis=0)
#sr = np.repeat(sr[np.newaxis, :], surface.Ny, axis=0)
#gr = np.repeat(gr[np.newaxis, :], surface.Ny, axis=0)
#Let's try to safe some memory and some operations
inc = inc.reshape(1, inc.size)
sr = sr.reshape(1, sr.size)
gr = gr.reshape(1, gr.size)
sin_inc = np.sin(inc)
cos_inc = np.cos(inc)
# lambda, K, resolution, time, etc.
l0 = const.c / f0
k0 = 2. * np.pi * f0 / const.c
sr_res = const.c / (2. * rg_bw)
if cfg.sar.L_total:
ant_L = ant_L / np.float(num_ch)
d_chan = ant_L
else:
if np.float(cfg.sar.Spacing) != 0:
d_chan = np.float(cfg.sar.Spacing)
else:
d_chan = ant_L
if v_ground == 'auto':
v_ground = geosar.orbit_to_vel(alt, ground=True)
t_step = 1. / prf
t_span = (1.5 * (sr0 * l0 / ant_L) + surface.Ly) / v_ground
az_steps = np.int(np.floor(t_span / t_step))
# Number of RG samples
max_sr = np.max(sr) + wh_tol + (np.max(surface.y_full) +
(t_span / 2.) * v_ground)**2. / (2. * sr0)
min_sr = np.min(sr) - wh_tol
rg_samp_orig = np.int(np.ceil(((max_sr - min_sr) / sr_res) * over_fs))
rg_samp = np.int(utils.optimize_fftsize(rg_samp_orig))
# Other initializations
if do_hh:
proc_raw_hh = np.zeros([num_ch, az_steps, rg_samp], dtype=np.complex)
if do_vv:
proc_raw_vv = np.zeros([num_ch, az_steps, rg_samp], dtype=np.complex)
t_last_rcs_bragg = -1.
last_progress = -1
NRCS_avg_vv = np.zeros(az_steps, dtype=np.float)
NRCS_avg_hh = np.zeros(az_steps, dtype=np.float)
## RCS MODELS
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
rcs_spec = rcs.RCSKodis(inc, k0, surface.dx, surface.dy)
elif scat_spec_mode == 'fa' or scat_spec_mode == 'spa':
spec_ph0 = np.random.uniform(0.,
2. * np.pi,
size=[surface.Ny, surface.Nx])
rcs_spec = rcs.RCSKA(scat_spec_mode, k0, surface.x, surface.y,
surface.dx, surface.dy)
else:
raise NotImplementedError(
'RCS mode %s for specular scattering not implemented' %
scat_spec_mode)
# Bragg
if scat_bragg_enable:
phase_bragg = np.zeros([2, surface.Ny, surface.Nx])
bragg_scats = np.zeros([2, surface.Ny, surface.Nx], dtype=np.complex)
# dop_phase_p = np.random.uniform(0., 2.*np.pi, size=[surface.Ny, surface.Nx])
# dop_phase_m = np.random.uniform(0., 2.*np.pi, size=[surface.Ny, surface.Nx])
tau_c = closure.grid_coherence(cfg.ocean.wind_U, surface.dx, f0)
rndscat_p = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
rndscat_m = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
# NOTE: This ignores slope, may be changed
k_b = 2. * k0 * sin_inc
c_b = sin_inc * np.sqrt(const.g / k_b + 0.072e-3 * k_b)
if scat_bragg_model == 'romeiser97':
current_dir = np.deg2rad(cfg.ocean.current_dir)
current_vec = (cfg.ocean.current_mag * np.array(
[np.cos(current_dir), np.sin(current_dir)]))
U_dir = np.deg2rad(cfg.ocean.wind_dir)
U_vec = (cfg.ocean.wind_U *
np.array([np.cos(U_dir), np.sin(U_dir)]))
U_eff_vec = U_vec - current_vec
rcs_bragg = rcs.RCSRomeiser97(
k0, inc, pol, surface.dx, surface.dy, linalg.norm(U_eff_vec),
np.arctan2(U_eff_vec[1], U_eff_vec[0]), surface.wind_fetch,
scat_bragg_spec, scat_bragg_spread, scat_bragg_d)
else:
raise NotImplementedError(
'RCS model %s for Bragg scattering not implemented' %
scat_bragg_model)
surface_area = surface.dx * surface.dy * surface.Nx * surface.Ny
###################
# SIMULATION LOOP #
###################
if rank == 0:
print('Computing profiles...')
for az_step in np.arange(az_steps, dtype=np.int):
## AZIMUTH & SURFACE UPDATE
t_now = az_step * t_step
az_now = (t_now - t_span / 2.) * v_ground
# az = np.repeat((surface.y - az_now)[:, np.newaxis], surface.Nx, axis=1)
az = (surface.y - az_now).reshape((surface.Ny, 1))
surface.t = t_now
## COMPUTE RCS FOR EACH MODEL
# Note: SAR processing is range independent as slant range is fixed
sin_az = az / sr0
az_proj_angle = np.arcsin(az / gr0)
# Note: Projected displacements are added to slant range
sr_surface = (sr - cos_inc * surface.Dz + az / 2 * sin_az +
surface.Dx * sin_inc + surface.Dy * sin_az)
if do_hh:
scene_hh = np.zeros(
[int(surface.Ny), int(surface.Nx)], dtype=np.complex)
if do_vv:
scene_vv = np.zeros(
[int(surface.Ny), int(surface.Nx)], dtype=np.complex)
# Point target
if add_point_target and rank == 0:
sr_pt = (sr[0, surface.Nx / 2] + az[surface.Ny / 2, 0] / 2 *
sin_az[surface.Ny / 2, surface.Nx / 2])
pt_scat = (100. * np.exp(-1j * 2. * k0 * sr_pt))
if do_hh:
scene_hh[surface.Ny / 2, surface.Nx / 2] = pt_scat
if do_vv:
scene_vv[surface.Ny / 2, surface.Nx / 2] = pt_scat
sr_surface[surface.Ny / 2, surface.Nx / 2] = sr_pt
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
Esn_sp = np.sqrt(4. * np.pi) * rcs_spec.field(
az_proj_angle, sr_surface, surface.Diffx, surface.Diffy,
surface.Diffxx, surface.Diffyy, surface.Diffxy)
if do_hh:
scene_hh += Esn_sp
if do_vv:
scene_vv += Esn_sp
else:
# FIXME
if do_hh:
pol_tmp = 'hh'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc,
az_proj_angle, az_proj_angle + np.pi, surface.Dz,
surface.Diffx, surface.Diffy, surface.Diffxx,
surface.Diffyy, surface.Diffxy))
scene_hh += Esn_sp
if do_vv:
pol_tmp = 'vv'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc,
az_proj_angle, az_proj_angle + np.pi, surface.Dz,
surface.Diffx, surface.Diffy, surface.Diffxx,
surface.Diffyy, surface.Diffxy))
scene_vv += Esn_sp
NRCS_avg_hh[az_step] += (np.sum(np.abs(Esn_sp)**2) / surface_area)
NRCS_avg_vv[az_step] += NRCS_avg_hh[az_step]
# Bragg
if scat_bragg_enable:
if (t_now - t_last_rcs_bragg) > ocean_dt:
if scat_bragg_model == 'romeiser97':
if pol == 'DP':
RCS_bragg_hh, RCS_bragg_vv = rcs_bragg.rcs(
az_proj_angle, surface.Diffx, surface.Diffy)
elif pol == 'hh':
RCS_bragg_hh = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
else:
RCS_bragg_vv = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
if use_hmtf:
# Fix Bad MTF points
surface.hMTF[np.where(surface.hMTF < -1)] = -1
if do_hh:
RCS_bragg_hh[0] *= (1 + surface.hMTF)
RCS_bragg_hh[1] *= (1 + surface.hMTF)
if do_vv:
RCS_bragg_vv[0] *= (1 + surface.hMTF)
RCS_bragg_vv[1] *= (1 + surface.hMTF)
t_last_rcs_bragg = t_now
if do_hh:
scat_bragg_hh = np.sqrt(RCS_bragg_hh)
NRCS_bragg_hh_instant_avg = np.sum(RCS_bragg_hh) / surface_area
NRCS_avg_hh[az_step] += NRCS_bragg_hh_instant_avg
if do_vv:
scat_bragg_vv = np.sqrt(RCS_bragg_vv)
NRCS_bragg_vv_instant_avg = np.sum(RCS_bragg_vv) / surface_area
NRCS_avg_vv[az_step] += NRCS_bragg_vv_instant_avg
# Doppler phases (Note: Bragg radial velocity taken constant!)
surf_phase = -(2 * k0) * sr_surface
cap_phase = (2 * k0) * t_step * c_b * (az_step + 1)
phase_bragg[0] = surf_phase - cap_phase # + dop_phase_p
phase_bragg[1] = surf_phase + cap_phase # + dop_phase_m
bragg_scats[0] = rndscat_m.scats(t_now)
bragg_scats[1] = rndscat_p.scats(t_now)
if do_hh:
scene_hh += ne.evaluate(
'sum(scat_bragg_hh * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
if do_vv:
scene_vv += ne.evaluate(
'sum(scat_bragg_vv * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
## ANTENNA PATTERN
if cfg.sar.L_total:
beam_pattern = sinc_1tx_nrx(sin_az,
ant_L * num_ch,
f0,
num_ch,
field=True)
else:
beam_pattern = sinc_1tx_nrx(sin_az, ant_L, f0, 1, field=True)
## GENERATE CHANEL PROFILES
for ch in np.arange(num_ch, dtype=np.int):
if do_hh:
scene_bp = scene_hh * beam_pattern
# Add channel phase & compute profile
scene_bp *= np.exp(-1j * k0 * d_chan * ch * sin_az)
if use_numba:
raw.chan_profile_numba(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / (over_fs), min_sr,
chan_sinc_vec, n_sinc_samples,
sinc_ovs, proc_raw_hh[ch][az_step])
else:
raw.chan_profile_weave(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / (over_fs), min_sr,
chan_sinc_vec, n_sinc_samples,
sinc_ovs, proc_raw_hh[ch][az_step])
if do_vv:
scene_bp = scene_vv * beam_pattern
# Add channel phase & compute profile
scene_bp *= np.exp(-1j * k0 * d_chan * ch * sin_az)
if use_numba:
raw.chan_profile_numba(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / (over_fs), min_sr,
chan_sinc_vec, n_sinc_samples,
sinc_ovs, proc_raw_vv[ch][az_step])
else:
raw.chan_profile_weave(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / (over_fs), min_sr,
chan_sinc_vec, n_sinc_samples,
sinc_ovs, proc_raw_vv[ch][az_step])
# SHOW PROGRESS (%)
current_progress = np.int((100 * az_step) / az_steps)
if current_progress != last_progress:
last_progress = current_progress
print(('SP,%d,%d,%d' % (rank, size, current_progress)))
# MERGE RESULTS
if do_hh:
total_raw_hh = np.empty_like(proc_raw_hh) if rank == 0 else None
comm.Reduce(proc_raw_hh, total_raw_hh, op=MPI.SUM, root=0)
if do_vv:
total_raw_vv = np.empty_like(proc_raw_vv) if rank == 0 else None
comm.Reduce(proc_raw_vv, total_raw_vv, op=MPI.SUM, root=0)
## PROCESS REDUCED RAW DATA & SAVE (ROOT)
if rank == 0:
print('Processing and saving results...')
# Filter and decimate
#range_filter = np.ones_like(total_raw)
#range_filter[:, :, rg_samp/(2*2*cfg.sar.over_fs):-rg_samp/(2*2*cfg.sar.over_fs)] = 0
#total_raw = np.fft.ifft(range_filter*np.fft.fft(total_raw))
if do_hh:
total_raw_hh = total_raw_hh[:, :, :rg_samp_orig]
if do_vv:
total_raw_vv = total_raw_vv[:, :, :rg_samp_orig]
# Calibration factor (projected antenna pattern integrated in azimuth)
az_axis = np.arange(-t_span / 2. * v_ground, t_span / 2. * v_ground,
sr0 * const.c / (np.pi * f0 * ant_L * 10.))
if cfg.sar.L_total:
pattern = sinc_1tx_nrx(az_axis / sr0,
ant_L * num_ch,
f0,
num_ch,
field=True)
else:
pattern = sinc_1tx_nrx(az_axis / sr0, ant_L, f0, 1, field=True)
cal_factor = (1. / np.sqrt(
np.trapz(np.abs(pattern)**2., az_axis) * sr_res /
np.sin(inc_angle)))
if do_hh:
noise = (utils.db2lin(nesz, amplitude=True) / np.sqrt(2.) *
(np.random.normal(size=total_raw_hh.shape) +
1j * np.random.normal(size=total_raw_hh.shape)))
total_raw_hh = total_raw_hh * cal_factor + noise
if do_vv:
noise = (utils.db2lin(nesz, amplitude=True) / np.sqrt(2.) *
(np.random.normal(size=total_raw_vv.shape) +
1j * np.random.normal(size=total_raw_vv.shape)))
total_raw_vv = total_raw_vv * cal_factor + noise
# Add slow-time error
# if use_errors:
# if do_hh:
# total_raw_hh *= errors.beta_noise
# if do_vv:
# total_raw_vv *= errors.beta_noise
# Save RAW data (and other properties, used by 3rd party software)
if do_hh and do_vv:
rshp = (1, ) + total_raw_hh.shape
total_raw = np.concatenate(
(total_raw_hh.reshape(rshp), total_raw_vv.reshape(rshp)))
rshp = (1, ) + NRCS_avg_hh.shape
NRCS_avg = np.concatenate(
(NRCS_avg_hh.reshape(rshp), NRCS_avg_vv.reshape(rshp)))
elif do_hh:
rshp = (1, ) + total_raw_hh.shape
total_raw = total_raw_hh.reshape(rshp)
rshp = (1, ) + NRCS_avg_hh.shape
NRCS_avg = NRCS_avg_hh.reshape(rshp)
else:
rshp = (1, ) + total_raw_vv.shape
total_raw = total_raw_vv.reshape(rshp)
rshp = (1, ) + NRCS_avg_vv.shape
NRCS_avg = NRCS_avg_vv.reshape(rshp)
raw_file = tpio.RawFile(output_file, 'w', total_raw.shape)
raw_file.set('inc_angle', np.rad2deg(inc_angle))
raw_file.set('f0', f0)
raw_file.set('num_ch', num_ch)
raw_file.set('ant_L', ant_L)
raw_file.set('prf', prf)
raw_file.set('v_ground', v_ground)
raw_file.set('orbit_alt', alt)
raw_file.set('sr0', sr0)
raw_file.set('rg_sampling', rg_bw * over_fs)
raw_file.set('rg_bw', rg_bw)
raw_file.set('raw_data*', total_raw)
raw_file.set('NRCS_avg', NRCS_avg)
raw_file.close()
print((time.strftime("Finished [%Y-%m-%d %H:%M:%S]",
time.localtime())))
def surface_S(cfg_file=None, inc_deg=None, ntimes=2, t_step=10e-3):
""" This function generates a (short) time series of surface realizations.
:param scf_file: the full path to the configuration with all OCEANSAR parameters
:param inc_deg: the incident angle, in degree
:param ntimes: number of time samples generated.
:param t_step: spacing between time samples. This can be interpreted as the Pulse Repetition Interval
:returns: a tuple with the configuration object, the surfaces, the radial velocities for each grid point,
and the complex scattering coefficients
"""
cfg_file = utils.get_parFile(parfile=cfg_file)
cfg = io.ConfigFile(cfg_file)
use_hmtf = cfg.srg.use_hmtf
scat_spec_enable = cfg.srg.scat_spec_enable
scat_spec_mode = cfg.srg.scat_spec_mode
scat_bragg_enable = cfg.srg.scat_bragg_enable
scat_bragg_model = cfg.srg.scat_bragg_model
scat_bragg_d = cfg.srg.scat_bragg_d
scat_bragg_spec = cfg.srg.scat_bragg_spec
scat_bragg_spread = cfg.srg.scat_bragg_spread
# SAR
inc_angle = np.deg2rad(cfg.sar.inc_angle)
alt = cfg.sar.alt
f0 = cfg.sar.f0
prf = cfg.sar.prf
pol = cfg.sar.pol
l0 = const.c / f0
k0 = 2. * np.pi * f0 / const.c
if pol == 'DP':
do_hh = True
do_vv = True
elif pol == 'hh':
do_hh = True
do_vv = False
else:
do_hh = False
do_vv = True
# OCEAN / OTHERS
ocean_dt = cfg.ocean.dt
surface = OceanSurface()
compute = ['D', 'Diff', 'Diff2', 'V']
if use_hmtf:
compute.append('hMTF')
surface.init(cfg.ocean.Lx,
cfg.ocean.Ly,
cfg.ocean.dx,
cfg.ocean.dy,
cfg.ocean.cutoff_wl,
cfg.ocean.spec_model,
cfg.ocean.spread_model,
np.deg2rad(cfg.ocean.wind_dir),
cfg.ocean.wind_fetch,
cfg.ocean.wind_U,
cfg.ocean.current_mag,
np.deg2rad(cfg.ocean.current_dir),
cfg.ocean.swell_enable,
cfg.ocean.swell_ampl,
np.deg2rad(cfg.ocean.swell_dir),
cfg.ocean.swell_wl,
compute,
cfg.ocean.opt_res,
cfg.ocean.fft_max_prime,
choppy_enable=cfg.ocean.choppy_enable)
# Get a surface realization calculated
surface.t = 0
if inc_deg is None:
inc_deg = cfg.sar.inc_angle
inc_angle = np.radians(inc_deg)
sr0 = geosar.inc_to_sr(inc_angle, alt)
gr0 = geosar.inc_to_gr(inc_angle, alt)
gr = surface.x + gr0
sr, inc, _ = geosar.gr_to_geo(gr, alt)
sr -= np.min(sr)
inc = inc.reshape(1, inc.size)
sr = sr.reshape(1, sr.size)
gr = gr.reshape(1, gr.size)
sin_inc = np.sin(inc)
cos_inc = np.cos(inc)
t_last_rcs_bragg = -1.
last_progress = -1
NRCS_avg_vv = np.zeros(ntimes, dtype=np.float)
NRCS_avg_hh = np.zeros(ntimes, dtype=np.float)
# RCS MODELS
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
rcs_spec = rcs.RCSKodis(inc, k0, surface.dx, surface.dy)
elif scat_spec_mode == 'fa' or scat_spec_mode == 'spa':
spec_ph0 = np.random.uniform(0.,
2. * np.pi,
size=[surface.Ny, surface.Nx])
rcs_spec = rcs.RCSKA(scat_spec_mode, k0, surface.x, surface.y,
surface.dx, surface.dy)
else:
raise NotImplementedError(
'RCS mode %s for specular scattering not implemented' %
scat_spec_mode)
# Bragg
if scat_bragg_enable:
phase_bragg = np.zeros([2, surface.Ny, surface.Nx])
bragg_scats = np.zeros([2, surface.Ny, surface.Nx], dtype=np.complex)
tau_c = closure.grid_coherence(cfg.ocean.wind_U, surface.dx, f0)
rndscat_p = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
rndscat_m = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
# NOTE: This ignores slope, may be changed
k_b = 2. * k0 * sin_inc
c_b = sin_inc * np.sqrt(const.g / k_b + 0.072e-3 * k_b)
if scat_bragg_model == 'romeiser97':
current_dir = np.deg2rad(cfg.ocean.current_dir)
current_vec = (cfg.ocean.current_mag * np.array(
[np.cos(current_dir), np.sin(current_dir)]))
U_dir = np.deg2rad(cfg.ocean.wind_dir)
U_vec = (cfg.ocean.wind_U *
np.array([np.cos(U_dir), np.sin(U_dir)]))
U_eff_vec = U_vec - current_vec
rcs_bragg = rcs.RCSRomeiser97(
k0, inc, pol, surface.dx, surface.dy, linalg.norm(U_eff_vec),
np.arctan2(U_eff_vec[1], U_eff_vec[0]), surface.wind_fetch,
scat_bragg_spec, scat_bragg_spread, scat_bragg_d)
else:
raise NotImplementedError(
'RCS model %s for Bragg scattering not implemented' %
scat_bragg_model)
surface_area = surface.dx * surface.dy * surface.Nx * surface.Ny
if do_hh:
scene_hh = np.zeros([ntimes, surface.Ny, surface.Nx], dtype=np.complex)
if do_vv:
scene_vv = np.zeros([ntimes, surface.Ny, surface.Nx], dtype=np.complex)
for az_step in range(ntimes):
# AZIMUTH & SURFACE UPDATE
t_now = az_step * t_step
# az_now = (t_now - t_span/2.)*v_ground
az_now = 0
# az = np.repeat((surface.y - az_now)[:, np.newaxis], surface.Nx, axis=1)
az = (surface.y - az_now).reshape((surface.Ny, 1))
surface.t = t_now
## COMPUTE RCS FOR EACH MODEL
# Note: SAR processing is range independent as slant range is fixed
sin_az = az / sr0
az_proj_angle = np.arcsin(az / gr0)
# Note: Projected displacements are added to slant range
sr_surface = (sr - cos_inc * surface.Dz + az / 2 * sin_az +
surface.Dx * sin_inc + surface.Dy * sin_az)
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
Esn_sp = np.sqrt(4. * np.pi) * rcs_spec.field(
az_proj_angle, sr_surface, surface.Diffx, surface.Diffy,
surface.Diffxx, surface.Diffyy, surface.Diffxy)
if do_hh:
scene_hh[az_step] += Esn_sp
if do_vv:
scene_vv[az_step] += Esn_sp
else:
# FIXME
if do_hh:
pol_tmp = 'hh'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc,
az_proj_angle, az_proj_angle + np.pi, surface.Dz,
surface.Diffx, surface.Diffy, surface.Diffxx,
surface.Diffyy, surface.Diffxy))
scene_hh[az_step] += Esn_sp
if do_vv:
pol_tmp = 'vv'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc,
az_proj_angle, az_proj_angle + np.pi, surface.Dz,
surface.Diffx, surface.Diffy, surface.Diffxx,
surface.Diffyy, surface.Diffxy))
scene_vv[az_step] += Esn_sp
NRCS_avg_hh[az_step] += (np.sum(np.abs(Esn_sp)**2) / surface_area)
NRCS_avg_vv[az_step] += NRCS_avg_hh[az_step]
# Bragg
if scat_bragg_enable:
if (t_now - t_last_rcs_bragg) > ocean_dt:
if scat_bragg_model == 'romeiser97':
if pol == 'DP':
RCS_bragg_hh, RCS_bragg_vv = rcs_bragg.rcs(
az_proj_angle, surface.Diffx, surface.Diffy)
elif pol == 'hh':
RCS_bragg_hh = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
else:
RCS_bragg_vv = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
if use_hmtf:
# Fix Bad MTF points
surface.hMTF[np.where(surface.hMTF < -1)] = -1
if do_hh:
RCS_bragg_hh[0] *= (1 + surface.hMTF)
RCS_bragg_hh[1] *= (1 + surface.hMTF)
if do_vv:
RCS_bragg_vv[0] *= (1 + surface.hMTF)
RCS_bragg_vv[1] *= (1 + surface.hMTF)
t_last_rcs_bragg = t_now
if do_hh:
scat_bragg_hh = np.sqrt(RCS_bragg_hh)
NRCS_bragg_hh_instant_avg = np.sum(RCS_bragg_hh) / surface_area
NRCS_avg_hh[az_step] += NRCS_bragg_hh_instant_avg
if do_vv:
scat_bragg_vv = np.sqrt(RCS_bragg_vv)
NRCS_bragg_vv_instant_avg = np.sum(RCS_bragg_vv) / surface_area
NRCS_avg_vv[az_step] += NRCS_bragg_vv_instant_avg
# Doppler phases (Note: Bragg radial velocity taken constant!)
surf_phase = -(2 * k0) * sr_surface
cap_phase = (2 * k0) * t_step * c_b * (az_step + 1)
phase_bragg[0] = surf_phase - cap_phase # + dop_phase_p
phase_bragg[1] = surf_phase + cap_phase # + dop_phase_m
bragg_scats[0] = rndscat_m.scats(t_now)
bragg_scats[1] = rndscat_p.scats(t_now)
if do_hh:
scene_hh[az_step] += ne.evaluate(
'sum(scat_bragg_hh * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
if do_vv:
scene_vv[az_step] += ne.evaluate(
'sum(scat_bragg_vv * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
v_r = (surface.Vx * np.sin(inc) - surface.Vz * np.cos(inc))
if do_hh and do_vv:
return (cfg, surface.Dz, v_r, scene_hh, scene_vv)
elif do_hh:
return (cfg, surface.Dz, v_r, scene_hh)
else:
return (cfg, surface.Dz, v_r, scene_vv)
def fastraw(cfg_file, output_file, ocean_file, reuse_ocean_file, errors_file, reuse_errors_file,
plot_save=True):
###################
# INITIALIZATIONS #
###################
## MPI SETUP
comm = MPI.COMM_WORLD
size, rank = comm.Get_size(), comm.Get_rank()
## WELCOME
if rank == 0:
print('-------------------------------------------------------------------')
print(time.strftime("- OCEANSAR FAST RAW SAR GENERATOR: %Y-%m-%d %H:%M:%S", time.localtime()))
print('-------------------------------------------------------------------')
## CONFIGURATION FILE
# Note: variables are 'copied' to reduce code verbosity
cfg = tpio.ConfigFile(cfg_file)
# RAW
wh_tol = cfg.srg.wh_tol
nesz = cfg.srg.nesz
use_hmtf = cfg.srg.use_hmtf
scat_spec_enable = cfg.srg.scat_spec_enable
scat_spec_mode = cfg.srg.scat_spec_mode
scat_bragg_enable = cfg.srg.scat_bragg_enable
scat_bragg_model = cfg.srg.scat_bragg_model
scat_bragg_d = cfg.srg.scat_bragg_d
scat_bragg_spec = cfg.srg.scat_bragg_spec
scat_bragg_spread = cfg.srg.scat_bragg_spread
# SAR
inc_angle = np.deg2rad(cfg.sar.inc_angle)
f0 = cfg.sar.f0
pol = cfg.sar.pol
squint_r = np.degrees(cfg.sar.squint)
if pol == 'DP':
do_hh = True
do_vv = True
elif pol == 'hh':
do_hh = True
do_vv = False
else:
do_hh = False
do_vv = True
prf = cfg.sar.prf
num_ch = int(cfg.sar.num_ch)
ant_l = cfg.sar.ant_L
alt = cfg.sar.alt
v_ground = cfg.sar.v_ground
rg_bw = cfg.sar.rg_bw
over_fs = cfg.sar.over_fs
sigma_n_tx = cfg.sar.sigma_n_tx
phase_n_tx = np.deg2rad(cfg.sar.phase_n_tx)
sigma_beta_tx = cfg.sar.sigma_beta_tx
phase_beta_tx = np.deg2rad(cfg.sar.phase_beta_tx)
sigma_n_rx = cfg.sar.sigma_n_rx
phase_n_rx = np.deg2rad(cfg.sar.phase_n_rx)
sigma_beta_rx = cfg.sar.sigma_beta_rx
phase_beta_rx = np.deg2rad(cfg.sar.phase_beta_rx)
# OCEAN / OTHERS
ocean_dt = cfg.ocean.dt
add_point_target = False
use_numba = True
n_sinc_samples = 8
sinc_ovs = 20
chan_sinc_vec = raw.calc_sinc_vec(n_sinc_samples, sinc_ovs, Fs=over_fs)
# OCEAN SURFACE
print('Initializing ocean surface...')
surface = OceanSurface()
# Setup compute values
compute = ['D', 'Diff', 'Diff2']
if use_hmtf:
compute.append('hMTF')
# Try to reuse initialized surface
if reuse_ocean_file:
try:
surface.load(ocean_file, compute)
except RuntimeError:
pass
if (not reuse_ocean_file) or (not surface.initialized):
if hasattr(cfg.ocean, 'use_buoy_data'):
if cfg.ocean.use_buoy_data:
bdataf = cfg.ocean.buoy_data_file
date = datetime.datetime(np.int(cfg.ocean.year),
np.int(cfg.ocean.month),
np.int(cfg.ocean.day),
np.int(cfg.ocean.hour),
np.int(cfg.ocean.minute), 0)
date, bdata = tpio.load_buoydata(bdataf, date)
buoy_spec = tpio.BuoySpectra(bdata, heading=cfg.sar.heading, depth=cfg.ocean.depth)
dirspectrum_func = buoy_spec.Sk2
# Since the wind direction is included in the buoy data
wind_dir = 0
else:
dirspectrum_func = None
wind_dir = np.deg2rad(cfg.ocean.wind_dir)
else:
dirspectrum_func = None
wind_dir = np.deg2rad(cfg.ocean.wind_dir)
surface.init(cfg.ocean.Lx, cfg.ocean.Ly, cfg.ocean.dx,
cfg.ocean.dy, cfg.ocean.cutoff_wl,
cfg.ocean.spec_model, cfg.ocean.spread_model,
wind_dir,
cfg.ocean.wind_fetch, cfg.ocean.wind_U,
cfg.ocean.current_mag,
np.deg2rad(cfg.ocean.current_dir),
cfg.ocean.dir_swell_dir,
cfg.ocean.freq_r, cfg.ocean.sigf,
cfg.ocean.sigs, cfg.ocean.Hs,
cfg.ocean.swell_dir_enable,
cfg.ocean.swell_enable, cfg.ocean.swell_ampl,
np.deg2rad(cfg.ocean.swell_dir),
cfg.ocean.swell_wl,
compute, cfg.ocean.opt_res,
cfg.ocean.fft_max_prime,
choppy_enable=cfg.ocean.choppy_enable,
depth=cfg.ocean.depth,
dirspectrum_func=dirspectrum_func)
surface.save(ocean_file)
# Now we plot the directional spectrum
# self.wave_dirspec[good_k] = dirspectrum_func(self.kx[good_k], self.ky[good_k])
plt.figure()
plt.imshow(np.fft.fftshift(surface.wave_dirspec),
extent=[surface.kx.min(), surface.kx.max(),
surface.ky.min(), surface.ky.max()],
origin='lower',
cmap='inferno_r')
plt.grid(True)
pltax = plt.gca()
pltax.set_xlim((-0.1, 0.1))
pltax.set_ylim((-0.1, 0.1))
narr_length = 0.08 # np.min([surface_full.kx.max(), surface_full.ky.max()])
pltax.arrow(0, 0,
-narr_length * np.sin(np.radians(cfg.sar.heading)),
narr_length * np.cos(np.radians(cfg.sar.heading)),
fc="k", ec="k")
plt.xlabel('$k_x$ [rad/m]')
plt.ylabel('$k_y$ [rad/m]')
plt.colorbar()
#plt.show()
# Create plots directory
plot_path = os.path.dirname(output_file) + os.sep + 'raw_plots'
if plot_save:
if not os.path.exists(plot_path):
os.makedirs(plot_path)
plt.savefig(os.path.join(plot_path, 'input_dirspectrum.png'))
plt.close()
# CALCULATE PARAMETERS
if rank == 0:
print('Initializing simulation parameters...')
# SR/GR/INC Matrixes
sr0 = geosar.inc_to_sr(inc_angle, alt)
gr0 = geosar.inc_to_gr(inc_angle, alt)
gr = surface.x + gr0
sr, inc, _ = geosar.gr_to_geo(gr, alt)
sr -= np.min(sr)
inc = inc.reshape(1, inc.size)
sr = sr.reshape(1, sr.size)
gr = gr.reshape(1, gr.size)
sin_inc = np.sin(inc)
cos_inc = np.cos(inc)
# lambda, K, resolution, time, etc.
l0 = const.c/f0
k0 = 2.*np.pi*f0/const.c
sr_res = const.c/(2.*rg_bw)
if cfg.sar.L_total:
ant_l = ant_l/np.float(num_ch)
d_chan = ant_l
else:
if np.float(cfg.sar.Spacing) != 0:
d_chan = np.float(cfg.sar.Spacing)
else:
d_chan = ant_l
if v_ground == 'auto':
v_ground = geosar.orbit_to_vel(alt, ground=True)
t_step = 1./prf
t_span = (1.5*(sr0*l0/ant_l) + surface.Ly)/v_ground
az_steps = np.int(np.floor(t_span/t_step))
# Number of RG samples
max_sr = np.max(sr) + wh_tol + (np.max(surface.y) + (t_span/2.)*v_ground)**2./(2.*sr0)
min_sr = np.min(sr) - wh_tol
rg_samp_orig = np.int(np.ceil(((max_sr - min_sr)/sr_res)*over_fs))
rg_samp = np.int(utils.optimize_fftsize(rg_samp_orig))
# Other initializations
if do_hh:
proc_raw_hh = np.zeros([num_ch, az_steps, rg_samp], dtype=np.complex)
if do_vv:
proc_raw_vv = np.zeros([num_ch, az_steps, rg_samp], dtype=np.complex)
t_last_rcs_bragg = -1.
last_progress = -1
nrcs_avg_vv = np.zeros(az_steps, dtype=np.float)
nrcs_avg_hh = np.zeros(az_steps, dtype=np.float)
## RCS MODELS
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
rcs_spec = rcs.RCSKodis(inc, k0, surface.dx, surface.dy)
elif scat_spec_mode == 'fa' or scat_spec_mode == 'spa':
spec_ph0 = np.random.uniform(0., 2.*np.pi,
size=[surface.Ny, surface.Nx])
rcs_spec = rcs.RCSKA(scat_spec_mode, k0, surface.x, surface.y,
surface.dx, surface.dy)
else:
raise NotImplementedError('RCS mode %s for specular scattering not implemented' % scat_spec_mode)
# Bragg
if scat_bragg_enable:
phase_bragg = np.zeros([2, surface.Ny, surface.Nx])
bragg_scats = np.zeros([2, surface.Ny, surface.Nx], dtype=np.complex)
# dop_phase_p = np.random.uniform(0., 2.*np.pi, size=[surface.Ny, surface.Nx])
# dop_phase_m = np.random.uniform(0., 2.*np.pi, size=[surface.Ny, surface.Nx])
tau_c = closure.grid_coherence(cfg.ocean.wind_U,surface.dx, f0)
rndscat_p = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
rndscat_m = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
# NOTE: This ignores slope, may be changed
k_b = 2.*k0*sin_inc
c_b = sin_inc*np.sqrt(const.g/k_b + 0.072e-3*k_b)
if scat_bragg_model == 'romeiser97':
current_dir = np.deg2rad(cfg.ocean.current_dir)
current_vec = (cfg.ocean.current_mag *
np.array([np.cos(current_dir),
np.sin(current_dir)]))
U_dir = np.deg2rad(cfg.ocean.wind_dir)
U_vec = (cfg.ocean.wind_U *
np.array([np.cos(U_dir), np.sin(U_dir)]))
U_eff_vec = U_vec - current_vec
rcs_bragg = rcs.RCSRomeiser97(k0, inc, pol,
surface.dx, surface.dy,
linalg.norm(U_eff_vec),
np.arctan2(U_eff_vec[1],
U_eff_vec[0]),
surface.wind_fetch,
scat_bragg_spec, scat_bragg_spread,
scat_bragg_d)
else:
raise NotImplementedError('RCS model %s for Bragg scattering not implemented' % scat_bragg_model)
surface_area = surface.dx * surface.dy * surface.Nx * surface.Ny
###################
# SIMULATION LOOP #
###################
if rank == 0:
print('Computing profiles...')
for az_step in np.arange(az_steps, dtype=np.int):
# AZIMUTH & SURFACE UPDATE
t_now = az_step * t_step
az_now = (t_now - t_span/2.)*v_ground
# az = np.repeat((surface.y - az_now)[:, np.newaxis], surface.Nx, axis=1)
az = (surface.y - az_now).reshape((surface.Ny, 1))
surface.t = t_now
# COMPUTE RCS FOR EACH MODEL
# Note: SAR processing is range independent as slant range is fixed
sin_az = az / sr0
az_proj_angle = np.arcsin(az / gr0)
# Note: Projected displacements are added to slant range
sr_surface = (sr - cos_inc*surface.Dz + az/2*sin_az
+ surface.Dx*sin_inc + surface.Dy*sin_az)
if do_hh:
scene_hh = np.zeros([int(surface.Ny), int(surface.Nx)], dtype=np.complex)
if do_vv:
scene_vv = np.zeros([int(surface.Ny), int(surface.Nx)], dtype=np.complex)
# Point target
if add_point_target and rank == 0:
sr_pt = (sr[0, surface.Nx/2] + az[surface.Ny/2, 0]/2 *
sin_az[surface.Ny/2, surface.Nx/2])
pt_scat = (100. * np.exp(-1j * 2. * k0 * sr_pt))
if do_hh:
scene_hh[surface.Ny/2, surface.Nx/2] = pt_scat
if do_vv:
scene_vv[surface.Ny/2, surface.Nx/2] = pt_scat
sr_surface[surface.Ny/2, surface.Nx/2] = sr_pt
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
Esn_sp = np.sqrt(4.*np.pi)*rcs_spec.field(az_proj_angle, sr_surface,
surface.Diffx, surface.Diffy,
surface.Diffxx, surface.Diffyy, surface.Diffxy)
if do_hh:
scene_hh += Esn_sp
if do_vv:
scene_vv += Esn_sp
else:
# FIXME
if do_hh:
pol_tmp = 'hh'
Esn_sp = (np.exp(-1j*(2.*k0*sr_surface)) * (4.*np.pi)**1.5 *
rcs_spec.field(1, 1, pol_tmp[0], pol_tmp[1],
inc, inc,
az_proj_angle, az_proj_angle + np.pi,
surface.Dz,
surface.Diffx, surface.Diffy,
surface.Diffxx,
surface.Diffyy,
surface.Diffxy))
scene_hh += Esn_sp
if do_vv:
pol_tmp = 'vv'
Esn_sp = (np.exp(-1j*(2.*k0*sr_surface)) * (4.*np.pi)**1.5 *
rcs_spec.field(1, 1, pol_tmp[0], pol_tmp[1],
inc, inc,
az_proj_angle, az_proj_angle + np.pi,
surface.Dz,
surface.Diffx, surface.Diffy,
surface.Diffxx,
surface.Diffyy,
surface.Diffxy))
scene_vv += Esn_sp
nrcs_avg_hh[az_step] += (np.sum(np.abs(Esn_sp)**2) / surface_area)
nrcs_avg_vv[az_step] += nrcs_avg_hh[az_step]
# Bragg
if scat_bragg_enable:
if (t_now - t_last_rcs_bragg) > ocean_dt:
if scat_bragg_model == 'romeiser97':
if pol == 'DP':
rcs_bragg_hh, rcs_bragg_vv = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
elif pol=='hh':
rcs_bragg_hh = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
else:
rcs_bragg_vv = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
if use_hmtf:
# Fix Bad MTF points
surface.hMTF[np.where(surface.hMTF < -1)] = -1
if do_hh:
rcs_bragg_hh[0] *= (1 + surface.hMTF)
rcs_bragg_hh[1] *= (1 + surface.hMTF)
if do_vv:
rcs_bragg_vv[0] *= (1 + surface.hMTF)
rcs_bragg_vv[1] *= (1 + surface.hMTF)
t_last_rcs_bragg = t_now
if do_hh:
scat_bragg_hh = np.sqrt(rcs_bragg_hh)
nrcs_bragg_hh_instant_avg = np.sum(rcs_bragg_hh) / surface_area
nrcs_avg_hh[az_step] += nrcs_bragg_hh_instant_avg
if do_vv:
scat_bragg_vv = np.sqrt(rcs_bragg_vv)
nrcs_bragg_vv_instant_avg = np.sum(rcs_bragg_vv) / surface_area
nrcs_avg_vv[az_step] += nrcs_bragg_vv_instant_avg
# Doppler phases (Note: Bragg radial velocity taken constant!)
surf_phase = - (2 * k0) * sr_surface
cap_phase = (2 * k0) * t_step * c_b * (az_step + 1)
phase_bragg[0] = surf_phase - cap_phase # + dop_phase_p
phase_bragg[1] = surf_phase + cap_phase # + dop_phase_m
bragg_scats[0] = rndscat_m.scats(t_now)
bragg_scats[1] = rndscat_p.scats(t_now)
if do_hh:
scene_hh += ne.evaluate('sum(scat_bragg_hh * exp(1j*phase_bragg) * bragg_scats, axis=0)')
if do_vv:
scene_vv += ne.evaluate('sum(scat_bragg_vv * exp(1j*phase_bragg) * bragg_scats, axis=0)')
# ANTENNA PATTERN
# FIXME: this assume co-located Tx and Tx, so it will not work for true bistatic configurations
if cfg.sar.L_total:
beam_pattern = sinc_1tx_nrx(sin_az, ant_l * num_ch, f0, num_ch, field=True)
else:
beam_pattern = sinc_1tx_nrx(sin_az, ant_l, f0, 1, field=True)
# GENERATE CHANEL PROFILES
for ch in np.arange(num_ch, dtype=np.int):
if do_hh:
scene_bp = scene_hh * beam_pattern
# Add channel phase & compute profile
scene_bp *= np.exp(-1j*k0*d_chan*ch*sin_az)
if use_numba:
raw.chan_profile_numba(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / over_fs,
min_sr,
chan_sinc_vec,
n_sinc_samples, sinc_ovs,
proc_raw_hh[ch][az_step])
else:
raw.chan_profile_weave(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / over_fs,
min_sr,
chan_sinc_vec,
n_sinc_samples, sinc_ovs,
proc_raw_hh[ch][az_step])
if do_vv:
scene_bp = scene_vv * beam_pattern
# Add channel phase & compute profile
scene_bp *= np.exp(-1j*k0*d_chan*ch*sin_az)
if use_numba:
raw.chan_profile_numba(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / over_fs,
min_sr,
chan_sinc_vec,
n_sinc_samples, sinc_ovs,
proc_raw_vv[ch][az_step])
else:
raw.chan_profile_weave(sr_surface.flatten(),
scene_bp.flatten(),
sr_res / over_fs,
min_sr,
chan_sinc_vec,
n_sinc_samples, sinc_ovs,
proc_raw_vv[ch][az_step])
# SHOW PROGRESS (%)
current_progress = np.int((100 * az_step) / az_steps)
if current_progress != last_progress:
last_progress = current_progress
print('SP,%d,%d,%d' % (rank, size, current_progress))
# PROCESS REDUCED RAW DATA & SAVE (ROOT)
if rank == 0:
print('Processing and saving results...')
# Filter and decimate
#range_filter = np.ones_like(total_raw)
#range_filter[:, :, rg_samp/(2*2*cfg.sar.over_fs):-rg_samp/(2*2*cfg.sar.over_fs)] = 0
#total_raw = np.fft.ifft(range_filter*np.fft.fft(total_raw))
if do_hh:
proc_raw_hh = proc_raw_hh[:, :, :rg_samp_orig]
if do_vv:
proc_raw_vv = proc_raw_vv[:, :, :rg_samp_orig]
# Calibration factor (projected antenna pattern integrated in azimuth)
az_axis = np.arange(-t_span/2.*v_ground, t_span/2.*v_ground, sr0*const.c/(np.pi*f0*ant_l*10.))
if cfg.sar.L_total:
pattern = sinc_1tx_nrx(az_axis/sr0, ant_l * num_ch, f0,
num_ch, field=True)
else:
pattern = sinc_1tx_nrx(az_axis/sr0, ant_l, f0, 1,
field=True)
cal_factor = (1. / np.sqrt(np.trapz(np.abs(pattern)**2., az_axis) *
sr_res/np.sin(inc_angle)))
if do_hh:
noise = (utils.db2lin(nesz, amplitude=True) / np.sqrt(2.) *
(np.random.normal(size=proc_raw_hh.shape) +
1j*np.random.normal(size=proc_raw_hh.shape)))
total_raw_hh = proc_raw_hh * cal_factor + noise
if do_vv:
noise = (utils.db2lin(nesz, amplitude=True) / np.sqrt(2.) *
(np.random.normal(size=proc_raw_vv.shape) +
1j*np.random.normal(size=proc_raw_vv.shape)))
total_raw_vv = proc_raw_vv * cal_factor + noise
# Add slow-time error
# if use_errors:
# if do_hh:
# total_raw_hh *= errors.beta_noise
# if do_vv:
# total_raw_vv *= errors.beta_noise
# Save RAW data (and other properties, used by 3rd party software)
if do_hh and do_vv:
rshp = (1,) + proc_raw_hh.shape
proc_raw = np.concatenate((proc_raw_hh.reshape(rshp),
proc_raw_vv.reshape(rshp)))
rshp = (1,) + nrcs_avg_hh.shape
NRCS_avg = np.concatenate((nrcs_avg_hh.reshape(rshp),
nrcs_avg_vv.reshape(rshp)))
elif do_hh:
rshp = (1,) + proc_raw_hh.shape
proc_raw = proc_raw_hh.reshape(rshp)
rshp = (1,) + nrcs_avg_hh.shape
NRCS_avg = nrcs_avg_hh.reshape(rshp)
else:
rshp = (1,) + proc_raw_vv.shape
proc_raw = proc_raw_vv.reshape(rshp)
rshp = (1,) + nrcs_avg_vv.shape
NRCS_avg = nrcs_avg_vv.reshape(rshp)
raw_file = tpio.RawFile(output_file, 'w', proc_raw.shape)
raw_file.set('inc_angle', np.rad2deg(inc_angle))
raw_file.set('f0', f0)
raw_file.set('num_ch', num_ch)
raw_file.set('ant_l', ant_l)
raw_file.set('prf', prf)
raw_file.set('v_ground', v_ground)
raw_file.set('orbit_alt', alt)
raw_file.set('sr0', sr0)
raw_file.set('rg_sampling', rg_bw*over_fs)
raw_file.set('rg_bw', rg_bw)
raw_file.set('raw_data*', proc_raw)
raw_file.set('NRCS_avg', NRCS_avg)
raw_file.close()
print(time.strftime("Finished [%Y-%m-%d %H:%M:%S]", time.localtime()))
def surface_S(self, az_deg=0):
""" This function generates a (short) time series of surface realizations.
:param az_deg: azimuth angle, in degree
:param ntimes: number of time samples generated.
:param t_step: spacing between time samples. This can be interpreted as the Pulse Repetition Interval
:returns: a tuple with the configuration object, the surfaces, the radial velocities for each grid point,
and the complex scattering coefficients
"""
if not self.inc_is_set:
print("Set the incident angle first")
return
cfg = self.cfg
use_hmtf = self.use_hmtf
scat_spec_enable = self.scat_spec_enable
scat_spec_mode = self.scat_spec_mode
scat_bragg_enable = self.scat_bragg_enable
scat_bragg_model = self.scat_bragg_model
scat_bragg_d = self.scat_bragg_d
scat_bragg_spec = self.scat_bragg_spec
scat_bragg_spread = self.scat_bragg_spread
# SAR
try:
radcfg = cfg.sar
except AttributeError:
radcfg = cfg.radar
alt = radcfg.alt
f0 = radcfg.f0
prf = radcfg.prf
pol = self.pol
l0 = const.c / f0
k0 = 2. * np.pi * self.f0 / const.c
do_hh = self.do_hh
do_vv = self.do_vv
# OCEAN / OTHERS
ocean_dt = cfg.ocean.dt
# Get a surface realization calculated
# self.surface.t = 0
inc_angle = self.inc_angle
sr0 = geosar.inc_to_sr(inc_angle, alt)
gr0 = geosar.inc_to_gr(inc_angle, alt)
gr = self.surface.x + gr0
sr, inc, _ = geosar.gr_to_geo(gr, alt)
sr -= np.min(sr)
inc = inc.reshape(1, inc.size)
sr = sr.reshape(1, sr.size)
gr = gr.reshape(1, gr.size)
sin_inc = np.sin(inc)
cos_inc = np.cos(inc)
az_rad = np.radians(az_deg)
cos_az = np.cos(az_rad)
sin_az = np.sin(az_rad)
t_last_rcs_bragg = -1.
last_progress = -1
ntimes = self.ntimes
NRCS_avg_vv = np.zeros(ntimes, dtype=np.float)
NRCS_avg_hh = np.zeros(ntimes, dtype=np.float)
# RCS MODELS
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
rcs_spec = rcs.RCSKodis(inc, k0, self.surface.dx,
self.surface.dy)
elif scat_spec_mode == 'fa' or scat_spec_mode == 'spa':
spec_ph0 = np.random.uniform(
0., 2. * np.pi, size=[self.surface.Ny, self.surface.Nx])
rcs_spec = rcs.RCSKA(scat_spec_mode, k0, self.surface.x,
self.surface.y, self.surface.dx,
self.surface.dy)
else:
raise NotImplementedError(
'RCS mode %s for specular scattering not implemented' %
scat_spec_mode)
# Bragg
if scat_bragg_enable:
phase_bragg = np.zeros([2, self.surface.Ny, self.surface.Nx])
bragg_scats = np.zeros([2, self.surface.Ny, self.surface.Nx],
dtype=np.complex)
tau_c = closure.grid_coherence(cfg.ocean.wind_U, self.surface.dx,
f0)
rndscat_p = closure.randomscat_ts(
tau_c, (self.surface.Ny, self.surface.Nx), prf)
rndscat_m = closure.randomscat_ts(
tau_c, (self.surface.Ny, self.surface.Nx), prf)
# NOTE: This ignores slope, may be changed
k_b = 2. * k0 * sin_inc
c_b = sin_inc * np.sqrt(const.g / k_b + 0.072e-3 * k_b)
surface_area = self.surface.dx * self.surface.dy * self.surface.Nx * self.surface.Ny
if do_hh:
scene_hh = np.zeros([ntimes, self.surface.Ny, self.surface.Nx],
dtype=np.complex)
if do_vv:
scene_vv = np.zeros([ntimes, self.surface.Ny, self.surface.Nx],
dtype=np.complex)
for az_step in range(ntimes):
# AZIMUTH & SURFACE UPDATE
t_now = az_step * self.t_step
## COMPUTE RCS FOR EACH MODEL
# Note: SAR processing is range independent as slant range is fixed
# sin_az = az / sr0
# az_proj_angle = np.arcsin(az / gr0)
# Note: Projected displacements are added to slant range
sr_surface = (
sr - cos_inc * self.dz[az_step] + sin_inc *
(self.dx[az_step] * cos_az + self.dy[az_step] * sin_az))
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
Esn_sp = np.sqrt(4. * np.pi) * rcs_spec.field(
az_rad, sr_surface, self.diffx[az_step],
self.diffy[az_step], self.diffxx[az_step],
self.diffyy[az_step], self.diffxy[az_step])
if do_hh:
scene_hh[az_step] += Esn_sp
if do_vv:
scene_vv[az_step] += Esn_sp
else:
# FIXME
if do_hh:
pol_tmp = 'hh'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc, az_rad,
az_rad + np.pi, self.dz[az_step],
self.diffx[az_step], self.diffy[az_step],
self.diffxx[az_step], self.diffyy[az_step],
self.diffxy[az_step]))
scene_hh[az_step] += Esn_sp
if do_vv:
pol_tmp = 'vv'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc, az_rad,
az_rad + np.pi, self.dz[az_step],
self.diffx[az_step], self.diffy[az_step],
self.diffxx[az_step], self.diffyy[az_step],
self.diffxy[az_step]))
scene_vv[az_step] += Esn_sp
NRCS_avg_hh[az_step] += (np.sum(np.abs(Esn_sp)**2) /
surface_area)
NRCS_avg_vv[az_step] += NRCS_avg_hh[az_step]
# Bragg
if scat_bragg_enable:
if (t_now - t_last_rcs_bragg) > ocean_dt:
if scat_bragg_model == 'romeiser97':
if pol == 'DP':
RCS_bragg_hh, RCS_bragg_vv = self.rcs_bragg.rcs(
az_rad, self.diffx[az_step],
self.diffy[az_step])
elif pol == 'hh':
RCS_bragg_hh = self.rcs_bragg.rcs(
az_rad, self.diffx[az_step],
self.diffy[az_step])
else:
RCS_bragg_vv = self.rcs_bragg.rcs(
az_rad, self.diffx[az_step],
self.diffy[az_step])
if use_hmtf:
# Fix Bad MTF points
(self.h_mtf[az_step])[np.where(
self.surface.hMTF < -1)] = -1
if do_hh:
RCS_bragg_hh[0] *= (1 + self.h_mtf[az_step])
RCS_bragg_hh[1] *= (1 + self.h_mtf[az_step])
if do_vv:
RCS_bragg_vv[0] *= (1 + self.h_mtf[az_step])
RCS_bragg_vv[1] *= (1 + self.h_mtf[az_step])
t_last_rcs_bragg = t_now
if do_hh:
scat_bragg_hh = np.sqrt(RCS_bragg_hh)
NRCS_bragg_hh_instant_avg = np.sum(
RCS_bragg_hh) / surface_area
NRCS_avg_hh[az_step] += NRCS_bragg_hh_instant_avg
if do_vv:
scat_bragg_vv = np.sqrt(RCS_bragg_vv)
NRCS_bragg_vv_instant_avg = np.sum(
RCS_bragg_vv) / surface_area
NRCS_avg_vv[az_step] += NRCS_bragg_vv_instant_avg
# Doppler phases (Note: Bragg radial velocity taken constant!)
surf_phase = -(2 * k0) * sr_surface
cap_phase = (2 * k0) * self.t_step * c_b * (az_step + 1)
phase_bragg[0] = surf_phase - cap_phase # + dop_phase_p
phase_bragg[1] = surf_phase + cap_phase # + dop_phase_m
bragg_scats[0] = rndscat_m.scats(t_now)
bragg_scats[1] = rndscat_p.scats(t_now)
if do_hh:
scene_hh[az_step] += ne.evaluate(
'sum(scat_bragg_hh * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
if do_vv:
scene_vv[az_step] += ne.evaluate(
'sum(scat_bragg_vv * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
v_r = (self.surface.Vx * np.sin(inc) * np.cos(az_rad) +
self.surface.Vy * np.sin(inc) * np.sin(az_rad) -
self.surface.Vz * np.cos(inc))
sigma_v_r = np.std(v_r)
# Some stats
def weighted_stats(v, w):
wm = np.sum(v * w) / np.sum(w)
wsigma = np.sqrt(np.sum(w * (v - wm)**2) / np.sum(w))
return wm, wsigma
if do_hh:
w = np.abs(scene_hh[0])**2
# v_r_whh = np.sum(v_r * w) / np.sum(w)
v_r_whh, sigma_v_r_whh = weighted_stats(v_r, w)
# FIXME, for now just one lag
v_ati_hh = -(np.angle(np.mean(scene_hh[1] * np.conj(scene_hh[0])))
/ self.t_step * const.c / 2 / self.f0 / 2 / np.pi)
surfcoh_ati_hh = (np.mean(scene_hh[1] * np.conj(scene_hh[0])) /
np.sqrt(
np.mean(np.abs(scene_hh[1])**2) *
np.mean(np.abs(scene_hh[0])**2)))
if do_vv:
w = np.abs(scene_vv[0])**2
# v_r_wvv = np.sum(v_r * w) / np.sum(w)
v_r_wvv, sigma_v_r_wvv = weighted_stats(v_r, w)
v_ati_vv = -(np.angle(np.mean(scene_vv[1] * np.conj(scene_vv[0])))
/ self.t_step * const.c / 2 / self.f0 / 2 / np.pi)
surfcoh_ati_vv = (np.mean(scene_vv[1] * np.conj(scene_vv[0])) /
np.sqrt(
np.mean(np.abs(scene_vv[1])**2) *
np.mean(np.abs(scene_vv[0])**2)))
if do_hh and do_vv:
return {
'v_r': v_r,
'scene_hh': scene_hh,
'scene_vv': scene_vv,
'NRCS_hh': NRCS_avg_hh,
'NRCS_vv': NRCS_avg_vv,
'v_r_whh': v_r_whh,
'v_r_wvv': v_r_wvv,
'v_ATI_hh': v_ati_hh,
'v_ATI_vv': v_ati_vv,
'sigma_v_r': sigma_v_r,
'sigma_v_r_whh': sigma_v_r_whh,
'sigma_v_r_wvv': sigma_v_r_wvv,
'surfcoh_ati_hh': surfcoh_ati_hh,
'surfcoh_ati_vv': surfcoh_ati_vv
}
# return (cfg, self.surface.Dz, v_r, scene_hh, scene_vv)
elif do_hh:
return {
'v_r': v_r,
'scene_hh': scene_hh,
'scene_vv': None,
'NRCS_hh': NRCS_avg_hh,
'NRCS_vv': None,
'v_r_whh': v_r_whh,
'v_r_wvv': None,
'v_ATI_hh': v_ati_hh,
'v_ATI_vv': None,
'sigma_v_r': sigma_v_r,
'sigma_v_r_whh': sigma_v_r_whh,
'surfcoh_ati_hh': surfcoh_ati_hh
}
# return (cfg, self.surface.Dz, v_r, scene_hh)
else:
return {
'v_r': v_r,
'scene_hh': None,
'scene_vv': scene_vv,
'NRCS_hh': None,
'NRCS_vv': NRCS_avg_vv,
'v_r_whh': None,
'v_r_wvv': v_r_wvv,
'v_ATI_hh': None,
'v_ATI_vv': v_ati_vv,
'sigma_v_r': sigma_v_r,
'sigma_v_r_wvv': sigma_v_r_wvv,
'surfcoh_ati_vv': surfcoh_ati_vv
}
def skimraw(cfg_file,
output_file,
ocean_file,
reuse_ocean_file,
errors_file,
reuse_errors_file,
plot_save=True):
###################
# INITIALIZATIONS #
###################
# MPI SETUP
comm = MPI.COMM_WORLD
size, rank = comm.Get_size(), comm.Get_rank()
# WELCOME
if rank == 0:
print(
'-------------------------------------------------------------------'
)
print(
time.strftime("- OCEANSAR SKIM RAW GENERATOR: %Y-%m-%d %H:%M:%S",
time.localtime()))
# print('- Copyright (c) Gerard Marull Paretas, Paco Lopez Dekker')
print(
'-------------------------------------------------------------------'
)
# CONFIGURATION FILE
# Note: variables are 'copied' to reduce code verbosity
cfg = tpio.ConfigFile(cfg_file)
info = utils.PrInfo(cfg.sim.verbosity, "SKIM raw")
# RAW
wh_tol = cfg.srg.wh_tol
nesz = cfg.srg.nesz
use_hmtf = cfg.srg.use_hmtf
scat_spec_enable = cfg.srg.scat_spec_enable
scat_spec_mode = cfg.srg.scat_spec_mode
scat_bragg_enable = cfg.srg.scat_bragg_enable
scat_bragg_model = cfg.srg.scat_bragg_model
scat_bragg_d = cfg.srg.scat_bragg_d
scat_bragg_spec = cfg.srg.scat_bragg_spec
scat_bragg_spread = cfg.srg.scat_bragg_spread
# SAR
inc_angle = np.deg2rad(cfg.radar.inc_angle)
f0 = cfg.radar.f0
pol = cfg.radar.pol
squint_r = np.radians(90 - cfg.radar.azimuth)
if pol == 'DP':
do_hh = True
do_vv = True
elif pol == 'hh':
do_hh = True
do_vv = False
else:
do_hh = False
do_vv = True
prf = cfg.radar.prf
num_ch = int(cfg.radar.num_ch)
ant_L = cfg.radar.ant_L
alt = cfg.radar.alt
v_ground = cfg.radar.v_ground
rg_bw = cfg.radar.rg_bw
over_fs = cfg.radar.Fs / cfg.radar.rg_bw
sigma_n_tx = cfg.radar.sigma_n_tx
phase_n_tx = np.deg2rad(cfg.radar.phase_n_tx)
sigma_beta_tx = cfg.radar.sigma_beta_tx
phase_beta_tx = np.deg2rad(cfg.radar.phase_beta_tx)
sigma_n_rx = cfg.radar.sigma_n_rx
phase_n_rx = np.deg2rad(cfg.radar.phase_n_rx)
sigma_beta_rx = cfg.radar.sigma_beta_rx
phase_beta_rx = np.deg2rad(cfg.radar.phase_beta_rx)
# OCEAN / OTHERS
ocean_dt = cfg.ocean.dt
if hasattr(cfg.sim, "cal_targets"):
if cfg.sim.cal_targets is False:
add_point_target = False # This for debugging
point_target_floats = True # Not really needed, but makes coding easier later
else:
print("Adding cal targets")
add_point_target = True
if cfg.sim.cal_targets.lower() == 'floating':
point_target_floats = True
else:
point_target_floats = False
else:
add_point_target = False # This for debugging
point_target_floats = True
n_sinc_samples = 10
sinc_ovs = 20
chan_sinc_vec = raw.calc_sinc_vec(n_sinc_samples, sinc_ovs, Fs=over_fs)
# Set win direction with respect to beam
# I hope the following line is correct, maybe sign is wrong
wind_dir = cfg.radar.azimuth - cfg.ocean.wind_dir
# OCEAN SURFACE
if rank == 0:
print('Initializing ocean surface...')
surface_full = OceanSurface()
# Setup compute values
compute = ['D', 'Diff', 'Diff2']
if use_hmtf:
compute.append('hMTF')
# Try to reuse initialized surface
if reuse_ocean_file:
try:
surface_full.load(ocean_file, compute)
except RuntimeError:
pass
if (not reuse_ocean_file) or (not surface_full.initialized):
if hasattr(cfg.ocean, 'use_buoy_data'):
if cfg.ocean.use_buoy_data:
bdataf = cfg.ocean.buoy_data_file
date = datetime.datetime(np.int(cfg.ocean.year),
np.int(cfg.ocean.month),
np.int(cfg.ocean.day),
np.int(cfg.ocean.hour),
np.int(cfg.ocean.minute), 0)
date, bdata = tpio.load_buoydata(bdataf, date)
# FIX-ME: direction needs to consider also azimuth of beam
buoy_spec = tpio.BuoySpectra(bdata,
heading=cfg.radar.heading,
depth=cfg.ocean.depth)
dirspectrum_func = buoy_spec.Sk2
# Since the wind direction is included in the buoy data
wind_dir = 0
else:
dirspectrum_func = None
if cfg.ocean.swell_dir_enable:
dir_swell_spec = s_spec.ardhuin_swell_spec
else:
dir_swell_spec = None
wind_dir = np.deg2rad(wind_dir)
else:
if cfg.ocean.swell_dir_enable:
dir_swell_spec = s_spec.ardhuin_swell_spec
else:
dir_swell_spec = None
dirspectrum_func = None
wind_dir = np.deg2rad(wind_dir)
surface_full.init(
cfg.ocean.Lx,
cfg.ocean.Ly,
cfg.ocean.dx,
cfg.ocean.dy,
cfg.ocean.cutoff_wl,
cfg.ocean.spec_model,
cfg.ocean.spread_model,
wind_dir,
cfg.ocean.wind_fetch,
cfg.ocean.wind_U,
cfg.ocean.current_mag,
np.deg2rad(cfg.radar.azimuth - cfg.ocean.current_dir),
cfg.radar.azimuth - cfg.ocean.dir_swell_dir,
cfg.ocean.freq_r,
cfg.ocean.sigf,
cfg.ocean.sigs,
cfg.ocean.Hs,
cfg.ocean.swell_dir_enable,
cfg.ocean.swell_enable,
cfg.ocean.swell_ampl,
np.deg2rad(cfg.radar.azimuth - cfg.ocean.swell_dir),
cfg.ocean.swell_wl,
compute,
cfg.ocean.opt_res,
cfg.ocean.fft_max_prime,
choppy_enable=cfg.ocean.choppy_enable,
depth=cfg.ocean.depth,
dirspectrum_func=dirspectrum_func,
dir_swell_spec=dir_swell_spec)
surface_full.save(ocean_file)
# Now we plot the directional spectrum
# self.wave_dirspec[good_k] = dirspectrum_func(self.kx[good_k], self.ky[good_k])
plt.figure()
plt.imshow(np.fft.fftshift(surface_full.wave_dirspec),
extent=[
surface_full.kx.min(),
surface_full.kx.max(),
surface_full.ky.min(),
surface_full.ky.max()
],
origin='lower',
cmap='inferno_r')
plt.grid(True)
pltax = plt.gca()
pltax.set_xlim((-1, 1))
pltax.set_ylim((-1, 1))
Narr_length = 0.08 # np.min([surface_full.kx.max(), surface_full.ky.max()])
pltax.arrow(0,
0,
-Narr_length * np.sin(np.radians(cfg.radar.heading)),
Narr_length * np.cos(np.radians(cfg.radar.heading)),
fc="k",
ec="k")
plt.xlabel('$k_x$ [rad/m]')
plt.ylabel('$k_y$ [rad/m]')
plt.colorbar()
#plt.show()
# Create plots directory
plot_path = os.path.dirname(output_file) + os.sep + 'raw_plots'
if plot_save:
if not os.path.exists(plot_path):
os.makedirs(plot_path)
plt.savefig(os.path.join(plot_path, 'input_dirspectrum.png'))
plt.close()
if cfg.ocean.swell_dir_enable:
plt.figure()
plt.imshow(np.fft.fftshift(np.abs(surface_full.swell_dirspec)),
extent=[
surface_full.kx.min(),
surface_full.kx.max(),
surface_full.ky.min(),
surface_full.ky.max()
],
origin='lower',
cmap='inferno_r')
plt.grid(True)
pltax = plt.gca()
pltax.set_xlim((-0.1, 0.1))
pltax.set_ylim((-0.1, 0.1))
Narr_length = 0.08 # np.min([surface_full.kx.max(), surface_full.ky.max()])
pltax.arrow(
0,
0,
-Narr_length * np.sin(np.radians(cfg.radar.heading)),
Narr_length * np.cos(np.radians(cfg.radar.heading)),
fc="k",
ec="k")
plt.xlabel('$k_x$ [rad/m]')
plt.ylabel('$k_y$ [rad/m]')
plt.colorbar()
#plt.show()
# Create plots directory
plot_path = os.path.dirname(output_file) + os.sep + 'raw_plots'
if plot_save:
if not os.path.exists(plot_path):
os.makedirs(plot_path)
plt.savefig(
os.path.join(plot_path, 'input_dirspectrum_combined.png'))
plt.close()
else:
surface_full = None
# Initialize surface balancer
surface = OceanSurfaceBalancer(surface_full, ocean_dt)
# CALCULATE PARAMETERS
if rank == 0:
print('Initializing simulation parameters...')
# SR/GR/INC Matrixes
sr0 = geosar.inc_to_sr(inc_angle, alt)
gr0 = geosar.inc_to_gr(inc_angle, alt)
gr = surface.x + gr0
sr, inc, _ = geosar.gr_to_geo(gr, alt)
print(sr.dtype)
look = geosar.inc_to_look(inc, alt)
min_sr = np.min(sr)
# sr -= np.min(sr)
#inc = np.repeat(inc[np.newaxis, :], surface.Ny, axis=0)
#sr = np.repeat(sr[np.newaxis, :], surface.Ny, axis=0)
#gr = np.repeat(gr[np.newaxis, :], surface.Ny, axis=0)
#Let's try to safe some memory and some operations
inc = inc.reshape(1, inc.size)
look = look.reshape(1, inc.size)
sr = sr.reshape(1, sr.size)
gr = gr.reshape(1, gr.size)
sin_inc = np.sin(inc)
cos_inc = np.cos(inc)
# lambda, K, resolution, time, etc.
l0 = const.c / f0
k0 = 2. * np.pi * f0 / const.c
sr_res = const.c / (2. * rg_bw)
sr_smp = const.c / (2 * cfg.radar.Fs)
if cfg.radar.L_total:
ant_L = ant_L / np.float(num_ch)
if v_ground == 'auto':
v_ground = geosar.orbit_to_vel(alt, ground=True)
v_orb = geosar.orbit_to_vel(alt, ground=False)
else:
v_orb = v_ground
t_step = 1. / prf
az_steps = int(cfg.radar.n_pulses)
t_span = az_steps / prf
rg_samp = np.int(utils.optimize_fftsize(cfg.radar.n_rg))
#min_sr = np.mean(sr) - rg_samp / 2 * sr_smp
print(sr_smp)
max_sr = np.mean(sr) + rg_samp / 2 * sr_smp
sr_prof = (np.arange(rg_samp) - rg_samp / 2) * sr_smp + np.mean(sr)
gr_prof, inc_prof, look_prof, b_prof = geosar.sr_to_geo(sr_prof, alt)
look_prof = look_prof.reshape((1, look_prof.size))
sr_prof = sr_prof.reshape((1, look_prof.size))
dop_ref = 2 * v_orb * np.sin(look_prof) * np.sin(squint_r) / l0
print("skim_raw: Doppler Centroid is %f Hz" % (np.mean(dop_ref)))
if cfg.srg.two_scale_Doppler:
# We will compute less surface realizations
n_pulses_b = utils.optimize_fftsize(int(
cfg.srg.surface_coh_time * prf)) / 2
print("skim_raw: down-sampling rate =%i" % (n_pulses_b))
# n_pulses_b = 4
az_steps_ = int(np.ceil(az_steps / n_pulses_b))
t_step = t_step * n_pulses_b
# Maximum length in azimuth that we can consider to have the same geometric Doppler
dy_integ = cfg.srg.phase_err_tol / (2 * k0 * v_ground / min_sr *
cfg.srg.surface_coh_time)
surface_dy = surface.y[1] - surface.y[0]
ny_integ = (dy_integ / surface.dy)
print("skim_raw: ny_integ=%f" % (ny_integ))
if ny_integ < 1:
ny_integ = 1
else:
ny_integ = int(2**np.floor(np.log2(ny_integ)))
info.msg("skim_raw: size of intermediate radar data: %f MB" %
(8 * ny_integ * az_steps_ * rg_samp * 1e-6),
importance=1)
info.msg("skim_raw: ny_integ=%i" % (ny_integ), importance=1)
if do_hh:
proc_raw_hh = np.zeros(
[az_steps_, int(surface.Ny / ny_integ), rg_samp],
dtype=np.complex)
proc_raw_hh_step = np.zeros([surface.Ny, rg_samp],
dtype=np.complex)
if do_vv:
proc_raw_vv = np.zeros(
[az_steps_, int(surface.Ny / ny_integ), rg_samp],
dtype=np.complex)
proc_raw_vv_step = np.zeros([surface.Ny, rg_samp],
dtype=np.complex)
# Doppler centroid
# sin(a+da) = sin(a) + cos(a)*da - 1/2*sin(a)*da**2
az = surface.y.reshape((surface.Ny, 1))
# FIX-ME: this is a coarse approximation
da = az / gr_prof
sin_az = np.sin(
squint_r) + np.cos(squint_r) * da - 0.5 * np.sin(squint_r) * da**2
dop0 = 2 * v_orb * np.sin(look_prof) * sin_az / l0
# az / 2 * sin_sr _az
# az_now = (t_now - t_span / 2.) * v_ground * np.cos(squint_r)
# az = np.repeat((surface.y - az_now)[:, np.newaxis], surface.Nx, axis=1)
# az = (surface.y - az_now).reshape((surface.Ny, 1))
# print("Max az: %f" % (np.max(az)))
#dop0 = np.mean(np.reshape(dop0, (surface.Ny/ny_integ, ny_integ, rg_samp)), axis=1)
s_int = np.int(surface.Ny / ny_integ)
dop0 = np.mean(np.reshape(dop0, (s_int, np.int(ny_integ), rg_samp)),
axis=1)
else:
az_steps_ = az_steps
if do_hh:
proc_raw_hh = np.zeros([az_steps, rg_samp], dtype=np.complex)
if do_vv:
proc_raw_vv = np.zeros([az_steps, rg_samp], dtype=np.complex)
t_last_rcs_bragg = -1.
last_progress = -1
NRCS_avg_vv = np.zeros(az_steps, dtype=np.float)
NRCS_avg_hh = np.zeros(az_steps, dtype=np.float)
## RCS MODELS
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
rcs_spec = rcs.RCSKodis(inc, k0, surface.dx, surface.dy)
elif scat_spec_mode == 'fa' or scat_spec_mode == 'spa':
spec_ph0 = np.random.uniform(0.,
2. * np.pi,
size=[surface.Ny, surface.Nx])
rcs_spec = rcs.RCSKA(scat_spec_mode, k0, surface.x, surface.y,
surface.dx, surface.dy)
else:
raise NotImplementedError(
'RCS mode %s for specular scattering not implemented' %
scat_spec_mode)
# Bragg
if scat_bragg_enable:
phase_bragg = np.zeros([2, surface.Ny, surface.Nx])
bragg_scats = np.zeros([2, surface.Ny, surface.Nx], dtype=np.complex)
# dop_phase_p = np.random.uniform(0., 2.*np.pi, size=[surface.Ny, surface.Nx])
# dop_phase_m = np.random.uniform(0., 2.*np.pi, size=[surface.Ny, surface.Nx])
tau_c = closure.grid_coherence(cfg.ocean.wind_U, surface.dx, f0)
rndscat_p = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
rndscat_m = closure.randomscat_ts(tau_c, (surface.Ny, surface.Nx), prf)
# NOTE: This ignores slope, may be changed
k_b = 2. * k0 * sin_inc
c_b = sin_inc * np.sqrt(const.g / k_b + 0.072e-3 * k_b)
if scat_bragg_model == 'romeiser97':
current_dir = np.deg2rad(cfg.ocean.current_dir)
current_vec = (cfg.ocean.current_mag * np.array(
[np.cos(current_dir), np.sin(current_dir)]))
U_dir = np.deg2rad(cfg.ocean.wind_dir)
U_vec = (cfg.ocean.wind_U *
np.array([np.cos(U_dir), np.sin(U_dir)]))
U_eff_vec = U_vec - current_vec
rcs_bragg = rcs.RCSRomeiser97(
k0, inc, pol, surface.dx, surface.dy, linalg.norm(U_eff_vec),
np.arctan2(U_eff_vec[1], U_eff_vec[0]), surface.wind_fetch,
scat_bragg_spec, scat_bragg_spread, scat_bragg_d)
else:
raise NotImplementedError(
'RCS model %s for Bragg scattering not implemented' %
scat_bragg_model)
surface_area = surface.dx * surface.dy * surface.Nx * surface.Ny
###################
# SIMULATION LOOP #
###################
if rank == 0:
print('Computing profiles...')
for az_step in np.arange(az_steps_, dtype=np.int):
# AZIMUTH & SURFACE UPDATE
t_now = az_step * t_step
az_now = (t_now - t_span / 2.) * v_ground * np.cos(squint_r)
# az = np.repeat((surface.y - az_now)[:, np.newaxis], surface.Nx, axis=1)
az = (surface.y - az_now).reshape((surface.Ny, 1))
surface.t = t_now
if az_step == 0:
# Check wave-height
info.msg(
"Standard deviation of wave-height (peak-to-peak; i.e. x2): %f"
% (2 * np.std(surface.Dz)))
#if az_step == 0:
# print("Max Dx: %f" % (np.max(surface.Dx)))
# print("Max Dy: %f" % (np.max(surface.Dy)))
# print("Max Dz: %f" % (np.max(surface.Dz)))
# print("Max Diffx: %f" % (np.max(surface.Diffx)))
# print("Max Diffy: %f" % (np.max(surface.Diffy)))
# print("Max Diffxx: %f" % (np.max(surface.Diffxx)))
# print("Max Diffyy: %f" % (np.max(surface.Diffyy)))
# print("Max Diffxy: %f" % (np.max(surface.Diffxy)))
# COMPUTE RCS FOR EACH MODEL
# Note: SAR processing is range independent as slant range is fixed
sin_az = az / sr
az_proj_angle = np.arcsin(az / gr0)
# Note: Projected displacements are added to slant range
if point_target_floats is False: # This can only happen if point targets are enabled
surface.Dx[int(surface.Ny / 2), int(surface.Nx / 2)] = 0
surface.Dy[int(surface.Ny / 2), int(surface.Nx / 2)] = 0
surface.Dz[int(surface.Ny / 2), int(surface.Nx / 2)] = 0
if cfg.srg.two_scale_Doppler:
# slant-range for phase
sr_surface = (sr - cos_inc * surface.Dz + surface.Dx * sin_inc +
surface.Dy * sin_az)
if cfg.srg.rcm:
# add non common rcm
sr_surface4rcm = sr_surface + az / 2 * sin_az
else:
sr_surface4rcm = sr_surface
else:
# FIXME: check if global shift is included, in case we care about slow simulations
# slant-range for phase and Doppler
sr_surface = (sr - cos_inc * surface.Dz + az / 2 * sin_az +
surface.Dx * sin_inc + surface.Dy * sin_az)
sr_surface4rcm = sr_surface
if do_hh:
scene_hh = np.zeros(
[int(surface.Ny), int(surface.Nx)], dtype=np.complex)
if do_vv:
scene_vv = np.zeros(
[int(surface.Ny), int(surface.Nx)], dtype=np.complex)
# Specular
if scat_spec_enable:
if scat_spec_mode == 'kodis':
Esn_sp = np.sqrt(4. * np.pi) * rcs_spec.field(
az_proj_angle, sr_surface, surface.Diffx, surface.Diffy,
surface.Diffxx, surface.Diffyy, surface.Diffxy)
if do_hh:
scene_hh += Esn_sp
if do_vv:
scene_vv += Esn_sp
else:
# FIXME
if do_hh:
pol_tmp = 'hh'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc,
az_proj_angle, az_proj_angle + np.pi, surface.Dz,
surface.Diffx, surface.Diffy, surface.Diffxx,
surface.Diffyy, surface.Diffxy))
scene_hh += Esn_sp
if do_vv:
pol_tmp = 'vv'
Esn_sp = (
np.exp(-1j * (2. * k0 * sr_surface)) *
(4. * np.pi)**1.5 * rcs_spec.field(
1, 1, pol_tmp[0], pol_tmp[1], inc, inc,
az_proj_angle, az_proj_angle + np.pi, surface.Dz,
surface.Diffx, surface.Diffy, surface.Diffxx,
surface.Diffyy, surface.Diffxy))
scene_vv += Esn_sp
NRCS_avg_hh[az_step] += (np.sum(np.abs(Esn_sp)**2) / surface_area)
NRCS_avg_vv[az_step] += NRCS_avg_hh[az_step]
# Bragg
if scat_bragg_enable:
if (t_now - t_last_rcs_bragg) > ocean_dt:
if scat_bragg_model == 'romeiser97':
if pol == 'DP':
RCS_bragg_hh, RCS_bragg_vv = rcs_bragg.rcs(
az_proj_angle, surface.Diffx, surface.Diffy)
elif pol == 'hh':
RCS_bragg_hh = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
else:
RCS_bragg_vv = rcs_bragg.rcs(az_proj_angle,
surface.Diffx,
surface.Diffy)
if use_hmtf:
# Fix Bad MTF points
surface.hMTF[np.where(surface.hMTF < -1)] = -1
if do_hh:
RCS_bragg_hh[0] *= (1 + surface.hMTF)
RCS_bragg_hh[1] *= (1 + surface.hMTF)
if do_vv:
RCS_bragg_vv[0] *= (1 + surface.hMTF)
RCS_bragg_vv[1] *= (1 + surface.hMTF)
t_last_rcs_bragg = t_now
if do_hh:
scat_bragg_hh = np.sqrt(RCS_bragg_hh)
NRCS_bragg_hh_instant_avg = np.sum(RCS_bragg_hh) / surface_area
NRCS_avg_hh[az_step] += NRCS_bragg_hh_instant_avg
if do_vv:
scat_bragg_vv = np.sqrt(RCS_bragg_vv)
NRCS_bragg_vv_instant_avg = np.sum(RCS_bragg_vv) / surface_area
NRCS_avg_vv[az_step] += NRCS_bragg_vv_instant_avg
# Doppler phases (Note: Bragg radial velocity taken constant!)
surf_phase = -(2 * k0) * sr_surface
cap_phase = (2 * k0) * t_step * c_b * (az_step + 1)
phase_bragg[0] = surf_phase - cap_phase # + dop_phase_p
phase_bragg[1] = surf_phase + cap_phase # + dop_phase_m
bragg_scats[0] = rndscat_m.scats(t_now)
bragg_scats[1] = rndscat_p.scats(t_now)
if do_hh:
scene_hh += ne.evaluate(
'sum(scat_bragg_hh * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
if do_vv:
scene_vv += ne.evaluate(
'sum(scat_bragg_vv * exp(1j*phase_bragg) * bragg_scats, axis=0)'
)
if add_point_target:
# Now we replace scattering at center by fixed value
pt_y = int(surface.Ny / 2)
pt_x = int(surface.Nx / 2)
if do_hh:
scene_hh[pt_y, pt_x] = 1000 * np.exp(
-1j * 2 * k0 * sr_surface[pt_y, pt_x])
if do_vv:
scene_vv[pt_y, pt_x] = 1000 * np.exp(
-1j * 2 * k0 * sr_surface[pt_y, pt_x])
## ANTENNA PATTERN
## FIXME: this assume co-located Tx and Tx, so it will not work for true bistatic configurations
if cfg.radar.L_total:
beam_pattern = sinc_1tx_nrx(sin_az,
ant_L * num_ch,
f0,
num_ch,
field=True)
else:
beam_pattern = sinc_1tx_nrx(sin_az, ant_L, f0, 1, field=True)
# GENERATE CHANEL PROFILES
if cfg.srg.two_scale_Doppler:
sr_surface_ = sr_surface4rcm
if do_hh:
proc_raw_hh_step[:, :] = 0
proc_raw_hh_ = proc_raw_hh_step
scene_bp_hh = scene_hh * beam_pattern
if do_vv:
proc_raw_vv_step[:, :] = 0
proc_raw_vv_ = proc_raw_vv_step
scene_bp_vv = scene_vv * beam_pattern
else:
sr_surface_ = sr_surface4rcm.flatten()
if do_hh:
proc_raw_hh_ = proc_raw_hh[az_step]
scene_bp_hh = (scene_hh * beam_pattern).flatten()
if do_vv:
proc_raw_vv_ = proc_raw_vv[az_step]
scene_bp_vv = (scene_vv * beam_pattern).flatten()
if do_hh:
raw.chan_profile_numba(sr_surface_,
scene_bp_hh,
sr_smp,
sr_prof.min(),
chan_sinc_vec,
n_sinc_samples,
sinc_ovs,
proc_raw_hh_,
rg_only=cfg.srg.two_scale_Doppler)
if do_vv:
raw.chan_profile_numba(sr_surface_,
scene_bp_vv,
sr_smp,
sr_prof.min(),
chan_sinc_vec,
n_sinc_samples,
sinc_ovs,
proc_raw_vv_,
rg_only=cfg.srg.two_scale_Doppler)
if cfg.srg.two_scale_Doppler:
#Integrate in azimuth
s_int = np.int(surface.Ny / ny_integ)
if do_hh:
proc_raw_hh[az_step] = np.sum(np.reshape(
proc_raw_hh_, (s_int, ny_integ, rg_samp)),
axis=1)
info.msg("Max abs(HH): %f" %
np.max(np.abs(proc_raw_hh[az_step])),
importance=1)
if do_vv:
#print(proc_raw_vv.shape)
proc_raw_vv[az_step] = np.sum(np.reshape(
proc_raw_vv_, (s_int, ny_integ, rg_samp)),
axis=1)
info.msg("Max abs(VV): %f" %
np.max(np.abs(proc_raw_vv[az_step])),
importance=1)
# SHOW PROGRESS (%)
current_progress = np.int((100 * az_step) / az_steps_)
if current_progress != last_progress:
last_progress = current_progress
info.msg('SP,%d,%d,%d%%' % (rank, size, current_progress),
importance=1)
if cfg.srg.two_scale_Doppler:
# No we have to up-sample and add Doppler
info.msg("skim_raw: Dopplerizing and upsampling")
print(dop0.max())
print(n_pulses_b)
print(prf)
if do_hh:
proc_raw_hh = upsample_and_dopplerize(proc_raw_hh, dop0,
n_pulses_b, prf)
if do_vv:
proc_raw_vv = upsample_and_dopplerize(proc_raw_vv, dop0,
n_pulses_b, prf)
# MERGE RESULTS
if do_hh:
total_raw_hh = np.empty_like(proc_raw_hh) if rank == 0 else None
comm.Reduce(proc_raw_hh, total_raw_hh, op=MPI.SUM, root=0)
if do_vv:
total_raw_vv = np.empty_like(proc_raw_vv) if rank == 0 else None
comm.Reduce(proc_raw_vv, total_raw_vv, op=MPI.SUM, root=0)
## PROCESS REDUCED RAW DATA & SAVE (ROOT)
if rank == 0:
info.msg('calibrating and saving results...')
# Filter and decimate
#range_filter = np.ones_like(total_raw)
#range_filter[:, :, rg_samp/(2*2*cfg.radar.over_fs):-rg_samp/(2*2*cfg.radar.over_fs)] = 0
#total_raw = np.fft.ifft(range_filter*np.fft.fft(total_raw))
if do_hh:
total_raw_hh = total_raw_hh[:, :cfg.radar.n_rg]
if do_vv:
total_raw_vv = total_raw_vv[:, :cfg.radar.n_rg]
# Calibration factor (projected antenna pattern integrated in azimuth)
az_axis = np.arange(-t_span / 2. * v_ground, t_span / 2. * v_ground,
sr0 * const.c / (np.pi * f0 * ant_L * 10.))
if cfg.radar.L_total:
pattern = sinc_1tx_nrx(az_axis / sr0,
ant_L * num_ch,
f0,
num_ch,
field=True)
else:
pattern = sinc_1tx_nrx(az_axis / sr0, ant_L, f0, 1, field=True)
cal_factor = (1. / np.sqrt(
np.trapz(np.abs(pattern)**2., az_axis) * sr_res /
np.sin(inc_angle)))
if do_hh:
noise = (utils.db2lin(nesz, amplitude=True) / np.sqrt(2.) *
(np.random.normal(size=total_raw_hh.shape) +
1j * np.random.normal(size=total_raw_hh.shape)))
total_raw_hh = total_raw_hh * cal_factor + noise
if do_vv:
noise = (utils.db2lin(nesz, amplitude=True) / np.sqrt(2.) *
(np.random.normal(size=total_raw_vv.shape) +
1j * np.random.normal(size=total_raw_vv.shape)))
total_raw_vv = total_raw_vv * cal_factor + noise
# Add slow-time error
# if use_errors:
# if do_hh:
# total_raw_hh *= errors.beta_noise
# if do_vv:
# total_raw_vv *= errors.beta_noise
# Save RAW data
if do_hh and do_vv:
rshp = (1, ) + total_raw_hh.shape
total_raw = np.concatenate(
(total_raw_hh.reshape(rshp), total_raw_vv.reshape(rshp)))
rshp = (1, ) + NRCS_avg_hh.shape
NRCS_avg = np.concatenate(
(NRCS_avg_hh.reshape(rshp), NRCS_avg_vv.reshape(rshp)))
elif do_hh:
rshp = (1, ) + total_raw_hh.shape
total_raw = total_raw_hh.reshape(rshp)
rshp = (1, ) + NRCS_avg_hh.shape
NRCS_avg = NRCS_avg_hh.reshape(rshp)
else:
rshp = (1, ) + total_raw_vv.shape
total_raw = total_raw_vv.reshape(rshp)
rshp = (1, ) + NRCS_avg_vv.shape
NRCS_avg = NRCS_avg_vv.reshape(rshp)
raw_file = tpio.SkimRawFile(output_file, 'w', total_raw.shape)
raw_file.set('inc_angle', np.rad2deg(inc_angle))
raw_file.set('f0', f0)
# raw_file.set('num_ch', num_ch)
raw_file.set('ant_L', ant_L)
raw_file.set('prf', prf)
raw_file.set('v_ground', v_ground)
raw_file.set('orbit_alt', alt)
raw_file.set('sr0', sr0)
raw_file.set('rg_sampling', rg_bw * over_fs)
raw_file.set('rg_bw', rg_bw)
raw_file.set('raw_data*', total_raw)
raw_file.set('NRCS_avg', NRCS_avg)
raw_file.set('azimuth', cfg.radar.azimuth)
raw_file.set('dop_ref', dop_ref)
raw_file.close()
print(time.strftime("Finished [%Y-%m-%d %H:%M:%S]", time.localtime()))