def get_Jy_per_count(dir, psr_cal_file, fitAA, fitBB):
file = dir + psr_cal_file
ar = Archive(file, verbose=False)
rfi = RFIMitigator(ar)
ar.tscrunch()
s_duty = ar.getValue("CAL_PHS")
duty = ar.getValue("CAL_DCYC")
nchan = ar.getNchan()
npol = ar.getNpol()
nbin = ar.getNbin()
BW = ar.getBandwidth()
data = ar.getData()
CTR_FREQ = ar.getCenterFrequency(weighted=True)
converted_data = IQUV_to_AABB(data, basis="cartesian")
frequencies = chan_to_freq(CTR_FREQ, BW, nchan)
psr_cal, high_psr, low_psr = np.zeros((2, nchan, nbin)), np.zeros(
(2, nchan)), np.zeros((2, nchan))
for i in np.arange(2):
for j in np.arange(nchan):
psr_cal[i][j], high_psr[i][j], low_psr[i][j] = prepare_cal_profile(
converted_data[0][i][j], s_duty, duty)
# Calculate jy_per_count{p, f}
jy_per_count_factor = np.zeros_like(high_psr)
# for i in np.arange( 2 ):
for j in np.arange(nchan):
jy_per_count_factor[0][j] = fitAA(frequencies[j]) / (
high_psr[0][j] - low_psr[0][j]) # A has units Jy / count
for j in np.arange(nchan):
jy_per_count_factor[1][j] = fitBB(frequencies[j]) / (
high_psr[1][j] - low_psr[1][j]) # A has units Jy / count
return jy_per_count_factor
def get_AABB_Fcal(dir, continuum_on, continuum_off, args, G=10.0, T0=1.0):
ON, OFF = dir + continuum_on, dir + continuum_off
if args.freq_zap is not None:
for i, arg in enumerate(args.freq_zap):
args.freq_zap[i] = int(args.freq_zap[i])
ar_on, ar_off = Archive(ON, verbose=False), Archive(OFF, verbose=False)
rfi_on, rfi_off = RFIMitigator(ar_on), RFIMitigator(ar_off)
s_duty_on, s_duty_off = ar_on.getValue("CAL_PHS"), ar_off.getValue(
"CAL_PHS")
duty_on, duty_off = ar_on.getValue("CAL_DCYC"), ar_off.getValue("CAL_DCYC")
nchan_on, nchan_off = ar_on.getNchan(), ar_off.getNchan()
npol_on, npol_off = ar_on.getNpol(), ar_off.getNpol()
nbin_on, nbin_off = ar_on.getNbin(), ar_off.getNbin()
BW_on, BW_off = ar_on.getBandwidth(), ar_off.getBandwidth()
CTR_FREQ_on, CTR_FREQ_off = ar_on.getCenterFrequency(
weighted=True), ar_off.getCenterFrequency(weighted=True)
ar_on.tscrunch()
ar_off.tscrunch()
if args.freq_zap is not None:
if len(args.freq_zap) == 1:
if args.channel_space:
rfi_on.zap_channels(args.freq_zap)
rfi_off.zap_channels(args.freq_zap)
else:
print(
"No zapping occurred (tried to zap channels in frequency space). Carrying on with calibration..."
)
elif len(args.freq_zap) == 2 and not args.channel_space:
rfi_on.zap_frequency_range(args.freq_zap[0], args.freq_zap[1])
rfi_off.zap_frequency_range(args.freq_zap[0], args.freq_zap[1])
else:
rfi_on.zap_channels(args.freq_zap)
rfi_off.zap_channels(args.freq_zap)
data_on, data_off = ar_on.getData(squeeze=True), ar_off.getData(
squeeze=True)
converted_data_on = IQUV_to_AABB(data_on, basis="cartesian")
converted_data_off = IQUV_to_AABB(data_off, basis="cartesian")
# Initialize the continuum data. SUBINT, POL,
continuum_on_source, high_on_mean, low_on_mean = np.zeros(
(2, nchan_on, nbin_on)), np.zeros((2, nchan_on)), np.zeros(
(2, nchan_on))
continuum_off_source, high_off_mean, low_off_mean = np.zeros(
(2, nchan_off, nbin_off)), np.zeros((2, nchan_off)), np.zeros(
(2, nchan_off))
f_on, f_off, C0 = np.zeros_like(high_on_mean), np.zeros_like(
high_off_mean), np.zeros_like(high_off_mean)
T_sys = np.zeros_like(C0)
F_cal = np.zeros_like(T_sys)
# Load the continuum data
for i in np.arange(2):
for j in np.arange(nchan_on):
continuum_on_source[i][j], high_on_mean[i][j], low_on_mean[i][
j] = prepare_cal_profile(converted_data_on[0][i][j], s_duty_on,
duty_on)
continuum_off_source[i][j], high_off_mean[i][j], low_off_mean[i][
j] = prepare_cal_profile(converted_data_off[0][i][j],
s_duty_off, duty_off)
f_on[i][j] = (high_on_mean[i][j] / low_on_mean[i][j]) - 1
f_off[i][j] = (high_off_mean[i][j] / low_off_mean[i][j]) - 1
if np.isnan(f_on[i][j]):
f_on[i][j] = 1
if np.isnan(f_on[i][j]):
f_off[i][j] = 1
C0[i][j] = T0 / ((1 / f_on[i][j]) - (1 / f_off[i][j]))
T_sys[i][j] = C0[i][j] / f_off[i][j]
F_cal[i][j] = (T_sys[i][j] *
f_off[i][j]) / G # F_cal has units Jy / cal
if np.isnan(F_cal[i][j]):
F_cal[i][j] = 0
frequencies_on_off = chan_to_freq(CTR_FREQ_on, BW_on, nchan_on)
f1, f2 = interp1d(frequencies_on_off,
F_cal[0],
kind='cubic',
fill_value='extrapolate'), interp1d(
frequencies_on_off,
F_cal[1],
kind='cubic',
fill_value='extrapolate')
return f1, f2