def parse_rinex_nav_msg_gps(file_name):
ephems = []
got_header = False
rinex_ver = None
#ion_alpha = None
#ion_beta = None
f = open(file_name, 'r')
while True:
line = f.readline()[:-1]
if not line:
break
if not got_header:
if rinex_ver is None:
if line[60:80] != "RINEX VERSION / TYPE":
raise RuntimeError("Doesn't appear to be a RINEX file")
rinex_ver = int(float(line[0:9]))
if line[20] != "N":
raise RuntimeError("Doesn't appear to be a Navigation Message file")
#if line[60:69] == "ION ALPHA":
# line = line.replace('D', 'E') # Handle bizarro float format
# ion_alpha= [float(line[3:14]), float(line[15:26]), float(line[27:38]), float(line[39:50])]
#if line[60:68] == "ION BETA":
# line = line.replace('D', 'E') # Handle bizarro float format
# ion_beta= [float(line[3:14]), float(line[15:26]), float(line[27:38]), float(line[39:50])]
if line[60:73] == "END OF HEADER":
#ion = ion_alpha + ion_beta
got_header = True
continue
if rinex_ver == 3:
if line[0] != 'G':
continue
if rinex_ver == 3:
prn = int(line[1:3])
epoch = GPSTime.from_datetime(datetime.strptime(line[4:23], "%y %m %d %H %M %S"))
elif rinex_ver == 2:
prn = int(line[0:2])
epoch = GPSTime.from_datetime(datetime.strptime(line[3:20], "%y %m %d %H %M %S"))
line = ' ' + line # Shift 1 char to the right
line = line.replace('D', 'E') # Handle bizarro float format
e = {'epoch': epoch, 'prn': prn}
e['toc'] = epoch
e['af0'] = float(line[23:42])
e['af1'] = float(line[42:61])
e['af2'] = float(line[61:80])
e['iode'], e['crs'], e['dn'], e['m0'] = read4(f, rinex_ver)
e['cuc'], e['ecc'], e['cus'], e['sqrta'] = read4(f, rinex_ver)
toe_tow, e['cic'], e['omega0'], e['cis'] = read4(f, rinex_ver)
e['inc'], e['crc'], e['w'], e['omegadot'] = read4(f, rinex_ver)
e['inc_dot'], e['l2_codes'], toe_week, e['l2_pflag'] = read4(f, rinex_ver)
e['sv_accuracy'], e['health'], e['tgd'], e['iodc'] = read4(f, rinex_ver)
f.readline() # Discard last row
e['toe'] = GPSTime(toe_week, toe_tow)
e['healthy'] = (e['health'] == 0.0)
ephems.append(GPSEphemeris(e, epoch))
f.close()
return ephems
def __init__(self, exp, data1, data2):
self.exp = exp
self.grid_TEC1 = np.array([], dtype='uint16')
self.grid_TEC2 = np.array([], dtype='uint16')
self.t1 = GPSTime.from_datetime(dt.datetime(*map(int, data1[0].split()[:6])))
self.t2 = GPSTime.from_datetime(dt.datetime(*map(int, data2[0].split()[:6])))
#assert self.t2 - self.t1 == SECS_IN_HR
assert len(data1) == len(data2)
self.max_time_diff = SECS_IN_MIN*30
self.epoch = self.t1 + self.max_time_diff
self.lats = np.array([])
for j, line in enumerate(data1[1:]):
if "LAT" in line:
lat, lon1, lon2, dlon, h = map(float, [line[x:x + 6] for x in range(2, 32, 6)])
self.lats = np.append(self.lats, lat)
row_length = (lon2 - lon1) / dlon + 1 # total number of values of longitudes
next_lines_with_numbers = int(np.ceil(row_length / 16))
elems_in_row = [
min(16, int(row_length - i * 16)) for i in range(next_lines_with_numbers)
]
row = np.array([], dtype='int16')
for i, elem in enumerate(elems_in_row):
row = np.append(row,
np.fromiter(
map(int,
[data1[j + 2 + i][5 * x:5 * x + 5] for x in range(elem)]),
dtype='int16'))
if len(self.grid_TEC1) > 0:
self.grid_TEC1 = np.vstack((self.grid_TEC1, row))
else:
self.grid_TEC1 = np.append(self.grid_TEC1, row)
self.lons = np.linspace(lon1, lon2, row_length)
self.lats = np.array([])
for j, line in enumerate(data2[1:]):
if "LAT" in line:
lat, lon1, lon2, dlon, h = map(float, [line[x:x + 6] for x in range(2, 32, 6)])
self.lats = np.append(self.lats, lat)
row_length = (lon2 - lon1) / dlon + 1 # total number of values of longitudes
next_lines_with_numbers = int(np.ceil(row_length / 16))
elems_in_row = [
min(16, int(row_length - i * 16)) for i in range(next_lines_with_numbers)
]
row = np.array([], dtype='int16')
for i, elem in enumerate(elems_in_row):
row = np.append(row,
np.fromiter(
map(int,
[data2[j + 2 + i][5 * x:5 * x + 5] for x in range(elem)]),
dtype='int16'))
if len(self.grid_TEC2) > 0:
self.grid_TEC2 = np.vstack((self.grid_TEC2, row))
else:
self.grid_TEC2 = np.append(self.grid_TEC2, row)
self.lons = np.linspace(lon1, lon2, row_length)
def download_nav(time, cache_dir, constellation='GPS'):
t = time.as_datetime()
try:
if GPSTime.from_datetime(datetime.utcnow()) - time > SECS_IN_DAY:
url_base = 'ftp://cddis.gsfc.nasa.gov/gnss/data/daily/'
cache_subdir = cache_dir + 'daily_nav/'
if constellation == 'GPS':
filename = t.strftime("brdc%j0.%yn")
folder_path = t.strftime('%Y/%j/%yn/')
elif constellation == 'GLONASS':
filename = t.strftime("brdc%j0.%yg")
folder_path = t.strftime('%Y/%j/%yg/')
return download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z')
else:
url_base = 'ftp://cddis.gsfc.nasa.gov/gnss/data/hourly/'
cache_subdir = cache_dir + 'hourly_nav/'
if constellation == 'GPS':
filename = t.strftime("hour%j0.%yn")
folder_path = t.strftime('%Y/%j/')
return download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z',
overwrite=True)
except IOError:
pass
def download_orbits_russia(time, cache_dir):
cache_subdir = cache_dir + 'russian_products/'
url_base = 'ftp://ftp.glonass-iac.ru/MCC/PRODUCTS/'
downloaded_files = []
for time in [time - SECS_IN_DAY, time, time + SECS_IN_DAY]:
t = time.as_datetime()
if GPSTime.from_datetime(datetime.utcnow()) - time > 2 * SECS_IN_WEEK:
try:
folder_path = t.strftime('%y%j/final/')
filename = "Sta%i%i.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base, folder_path, cache_subdir,
filename))
continue
except IOError:
pass
try:
folder_path = t.strftime('%y%j/rapid/')
filename = "Sta%i%i.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base, folder_path, cache_subdir, filename))
except IOError:
pass
try:
folder_path = t.strftime('%y%j/ultra/')
filename = "Sta%i%i.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base, folder_path, cache_subdir, filename))
except IOError:
pass
return downloaded_files
def parse_dcbs(file_name, SUPPORTED_CONSTELLATIONS):
with open(file_name, 'r+') as DCB_file:
contents = DCB_file.readlines()
data_started = False
dcbs_dict = {}
for line in contents:
if not data_started:
if line[1:4] == 'DSB':
data_started = True
else:
continue
line_components = line.split()
if len(line_components[2]) < 3:
break
prn = line_components[2]
if get_constellation(prn) not in SUPPORTED_CONSTELLATIONS:
continue
dcb_type = line_components[3] + '_' + line_components[4]
epoch = GPSTime.from_datetime(datetime.strptime(line_components[5], '%Y:%j:%f')) + 12*SECS_IN_HR
if prn not in dcbs_dict:
dcbs_dict[prn] = {}
dcbs_dict[prn][dcb_type] = float(line_components[8])
dcbs_dict[prn]['epoch'] = epoch
dcbs = []
for prn in dcbs_dict:
dcbs.append(DCB(prn, dcbs_dict[prn]))
return dcbs
def parse_rinex_nav_msg_glonass(file_name):
ephems = []
f = open(file_name, 'r')
got_header = False
rinex_ver = None
while True:
line = f.readline()[:-1]
if not line:
break
if not got_header:
if rinex_ver is None:
if line[60:80] != "RINEX VERSION / TYPE":
raise RuntimeError("Doesn't appear to be a RINEX file")
rinex_ver = int(float(line[0:9]))
if line[20] != "G":
raise RuntimeError(
"Doesn't appear to be a Navigation Message file")
if line[60:73] == "END OF HEADER":
got_header = True
continue
if rinex_ver == 3:
prn = line[:3]
epoch = GPSTime.from_datetime(
datetime.strptime(line[4:23], "%y %m %d %H %M %S"))
elif rinex_ver == 2:
prn = 'R%02i' % int(line[0:2])
epoch = GPSTime.from_datetime(
datetime.strptime(line[3:20], "%y %m %d %H %M %S"))
line = ' ' + line # Shift 1 char to the right
line = line.replace('D', 'E') # Handle bizarro float format
e = {'epoch': epoch, 'prn': prn}
e['toc'] = epoch
e['min_tauN'] = float(line[23:42])
e['GammaN'] = float(line[42:61])
e['tk'] = float(line[61:80])
e['x'], e['x_vel'], e['x_acc'], e['health'] = read4(f, rinex_ver)
e['y'], e['y_vel'], e['y_acc'], e['freq_num'] = read4(f, rinex_ver)
e['z'], e['z_vel'], e['z_acc'], e['age'] = read4(f, rinex_ver)
e['healthy'] = (e['health'] == 0.0)
ephems.append(GLONASSEphemeris(e, epoch))
f.close()
return ephems
def get_station_position(station_id,
cache_dir='/tmp/gnss/',
time=GPSTime.from_datetime(datetime.utcnow())):
cors_station_positions_path = cache_dir + 'cors_coord/cors_station_positions'
download_and_parse_station_postions(cors_station_positions_path, cache_dir)
cors_station_positions_file = open(cors_station_positions_path, 'r')
cors_station_positions_dict = np.load(cors_station_positions_file).item()
cors_station_positions_file.close()
epoch, pos, vel = cors_station_positions_dict[station_id]
return ((time - epoch) / SECS_IN_YEAR) * np.array(vel) + np.array(pos)
def download_and_parse_station_postions(cors_station_positions_path,
cache_dir):
if not os.path.isfile(cors_station_positions_path):
cors_stations = {}
coord_file_paths = download_cors_coords(cache_dir=cache_dir)
for coord_file_path in coord_file_paths:
try:
station_id = coord_file_path.split('/')[-1][:4]
with open(coord_file_path, 'r+') as coord_file:
contents = coord_file.readlines()
phase_center = False
for line_number in xrange(len(contents)):
if 'L1 Phase Center' in contents[line_number]:
phase_center = True
if not phase_center and 'IGS08 POSITION' in contents[
line_number]:
velocity = [
float(contents[line_number + 8].split()[3]),
float(contents[line_number + 9].split()[3]),
float(contents[line_number + 10].split()[3])
]
if phase_center and 'IGS08 POSITION' in contents[
line_number]:
epoch = GPSTime.from_datetime(datetime(2005, 1, 1))
position = [
float(contents[line_number + 2].split()[3]),
float(contents[line_number + 3].split()[3]),
float(contents[line_number + 4].split()[3])
]
cors_stations[station_id] = [epoch, position, velocity]
break
except ValueError:
pass
cors_station_positions_file = open(cors_station_positions_path, 'w')
np.save(cors_station_positions_file, cors_stations)
cors_station_positions_file.close()
def read_rinex_obs(obsdata):
measurements = []
first_sat = obsdata.data.keys()[0]
n = len(obsdata.data[first_sat]['Epochs'])
for i in xrange(0, n):
recv_time_datetime = obsdata.data[first_sat]['Epochs'][i]
recv_time_datetime = recv_time_datetime.astype(datetime.datetime)
recv_time = GPSTime.from_datetime(recv_time_datetime)
measurements.append([])
for sat_str in obsdata.data.keys():
if np.isnan(obsdata.data[sat_str]['C1'][i]):
continue
observables, observables_std = {}, {}
for obs in obsdata.data[sat_str]:
if obs == 'Epochs':
continue
observables[rinex3_obs_from_rinex2_obs(
obs)] = obsdata.data[sat_str][obs][i]
observables_std[rinex3_obs_from_rinex2_obs(obs)] = 1
measurements[-1].append(
GNSSMeasurement(get_prn_from_nmea_id(int(sat_str)),
recv_time.week, recv_time.tow, observables,
observables_std))
return measurements
def download_orbits(time, cache_dir):
cache_subdir = cache_dir + 'cddis_products/'
url_base = 'ftp://cddis.gsfc.nasa.gov/gnss/products/'
downloaded_files = []
for time in [time - SECS_IN_DAY, time, time + SECS_IN_DAY]:
folder_path = "%i/" % (time.week)
if GPSTime.from_datetime(datetime.utcnow()) - time > 3 * SECS_IN_WEEK:
try:
filename = "igs%i%i.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z'))
continue
except IOError:
pass
try:
filename = "igr%i%i.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z'))
continue
except IOError:
pass
try:
filename = "igu%i%i_18.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z'))
continue
except IOError:
pass
try:
filename = "igu%i%i_12.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z'))
continue
except IOError:
pass
try:
filename = "igu%i%i_06.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z'))
continue
except IOError:
pass
try:
filename = "igu%i%i_00.sp3" % (time.week, time.day)
downloaded_files.append(
download_file(url_base,
folder_path,
cache_subdir,
filename,
compression='.Z'))
continue
except IOError:
pass
return downloaded_files
def parse_sp3_orbits(file_names, SUPPORTED_CONSTELLATIONS):
ephems = []
data = {}
for file_name in file_names:
f = open(file_name, 'r')
while True:
line = f.readline()[:-1]
if not line:
break
# epoch header
if line[0:2] == '* ':
year = int(line[3:7])
month = int(line[8:10])
day = int(line[11:13])
hour = int(line[14:16])
minute = int(line[17:19])
second = int(float(line[20:31]))
epoch = GPSTime.from_datetime(
datetime(year, month, day, hour, minute, second))
# pos line
elif line[0] == 'P':
prn = line[1:4].replace(' ', '0')
if get_constellation(prn) not in SUPPORTED_CONSTELLATIONS:
continue
if prn not in data:
data[prn] = []
#TODO this is a crappy way to deal with overlapping ultra rapid
if len(data[prn]) < 1 or epoch - data[prn][-1][0] > 0:
parsed = [
epoch, 1e3 * float(line[4:18]),
1e3 * float(line[18:32]), 1e3 * float(line[32:46]),
1e-6 * float(line[46:60])
]
if (np.array(parsed[1:]) != 0).all():
data[prn].append(parsed)
f.close()
deg = 16
deg_t = 1
for prn in data:
# TODO Handle this properly
# Currently don't even bother with satellites that have unhealthy times
if (np.array(data[prn])[:, 4] > .99).any():
continue
for i in xrange(len(data[prn]) - deg):
times, x, y, z, clock = [], [], [], [], []
epoch = data[prn][i + deg / 2][0]
for j in xrange(deg + 1):
times.append(data[prn][i + j][0] - epoch)
x.append(data[prn][i + j][1])
y.append(data[prn][i + j][2])
z.append(data[prn][i + j][3])
clock.append(data[prn][i + j][4])
if (np.diff(times) != 900).any():
continue
poly_data = {}
poly_data['t0'] = epoch
poly_data['x'] = np.polyfit(times, x, deg)
poly_data['y'] = np.polyfit(times, y, deg)
poly_data['z'] = np.polyfit(times, z, deg)
poly_data['clock'] = [
(data[prn][i + deg / 2 + 1][4] - data[prn][i + deg / 2 - 1][4])
/ 1800, data[prn][i + deg / 2][4]
]
poly_data['deg'] = deg
poly_data['deg_t'] = deg_t
ephems.append(
PolyEphemeris(prn,
poly_data,
epoch,
healthy=True,
eph_type=EphemerisType.RAPID_ORBIT))
return ephems
import numpy as np
from astro_dog import AstroDog
from datetime import datetime
from gps_time import GPSTime
import raw_gnss as raw
import helpers as helpers
dog = AstroDog()
time = GPSTime.from_datetime(datetime(2018, 1, 7))
# example data contains an array of raw GNSS observables
# that were recorded during a minute of highway driving of
# a car, this array format can be used to create Laika's
# GNSSMeasurent object which can be processed with astrodog
# to then be analysed or used for position estimated.
with open('raw_gnss_ublox/value', 'rb') as f:
f.seek(0)
example_data = np.load(f)
measurements = [raw.normal_meas_from_array(m_arr) for m_arr in example_data]
# lets limit this to GPS sattelite for the sake of simplicity
measurements = [
m for m in measurements if helpers.get_constellation(m.prn) == 'GPS'
]
print('Exemplo de raw data de um satelite\n' + 'C1C = pseudorange\n' +
'D1C = doppler\n' + 'L1C = carrier phase\n' + 'S1C = signal strength\n',
measurements[0].observables) #observables ta no formato rinex
# we organize the measurements by epoch and by sattelite for easy plotting
measurements_by_epoch = raw.group_measurements_by_epoch(
