def compute_Fstat_spindown_simulateCW():
# waveform: simple spindown model
def waveform(h0, cosi, freq, f1dot):
def wf(dt):
dphi = lal.TWOPI * (freq * dt + f1dot * 0.5 * dt**2)
ap = h0 * (1.0 + cosi**2) / 2.0
ax = h0 * cosi
return dphi, ap, ax
return wf
# waveform parameters
dt_wf = 5
# create simulator
S = simCW.CWSimulator(tref, tstart, Tdata, waveform(h0, cosi, freq, f1dot), dt_wf, phi0, psi, alpha, delta, detector, earth_ephem_file=earth_ephem_file, sun_ephem_file=sun_ephem_file)
# write SFTs
for path, i, N in S.write_sft_files(fmax, Tsft, 'simulateCWTest'):
pass
# load SFTs from catalog
sft_catalog = lalpulsar.SFTdataFind('V-1_V1_1800SFT_simCW_simulateCWTest-*.sft', None)
# create default F-statistic optional arguments
Fstat_opt_args = lalpulsar.FstatOptionalArgs(lalpulsar.FstatOptionalArgsDefaults)
Fstat_opt_args.FstatMethod = lalpulsar.FMETHOD_DEMOD_BEST
Fstat_assume_noise = lalpulsar.MultiNoiseFloor()
Fstat_assume_noise.length = 1
Fstat_assume_noise.sqrtSn[0] = assume_sqrtSh
Fstat_opt_args.assumeSqrtSX = Fstat_assume_noise
# create F-statistic input data
Fstat_input = lalpulsar.CreateFstatInput(sft_catalog, fcmin, fcmax, dfreq, ephemerides, Fstat_opt_args)
Fstat_res = 0
doppler = lalpulsar.PulsarDopplerParams()
doppler.refTime = tref
doppler.Alpha = alpha
doppler.Delta = delta
doppler.fkdot[0] = fsmin
doppler.fkdot[1] = f1dot
# search SFTs using F-statistic
Fstat_res = lalpulsar.ComputeFstat(Fstat_res, Fstat_input, doppler, Nfs, lalpulsar.FSTATQ_2F)
return Fstat_res.twoF
def compute_Fstat_spindown_reference():
# create fake SFT catalog
sft_ts = lalpulsar.MakeTimestamps(tstart, Tdata, Tsft, 0)
sft_catalog = lalpulsar.AddToFakeSFTCatalog(None, detector, sft_ts)
# create default F-statistic optional arguments
Fstat_opt_args = lalpulsar.FstatOptionalArgs(
lalpulsar.FstatOptionalArgsDefaults)
Fstat_opt_args.FstatMethod = lalpulsar.FMETHOD_DEMOD_BEST
# create injection parameters
Fstat_signal = lalpulsar.CreatePulsarParamsVector(1)
Fstat_signal.data[0].Amp.aPlus = 0.5 * h0 * (1.0 + cosi * cosi)
Fstat_signal.data[0].Amp.aCross = h0 * cosi
Fstat_signal.data[0].Amp.psi = psi
Fstat_signal.data[0].Amp.phi0 = phi0
Fstat_signal.data[0].Doppler.refTime = tref
Fstat_signal.data[0].Doppler.Alpha = alpha
Fstat_signal.data[0].Doppler.Delta = delta
Fstat_signal.data[0].Doppler.fkdot[0] = freq
Fstat_signal.data[0].Doppler.fkdot[1] = f1dot
Fstat_opt_args.injectSources = Fstat_signal
Fstat_assume_noise = lalpulsar.MultiNoiseFloor()
Fstat_assume_noise.length = 1
Fstat_assume_noise.sqrtSn[0] = assume_sqrtSh
Fstat_opt_args.assumeSqrtSX = Fstat_assume_noise
# create F-statistic input data
Fstat_input = lalpulsar.CreateFstatInput(sft_catalog, fcmin, fcmax, dfreq,
ephemerides, Fstat_opt_args)
Fstat_res = 0
doppler = lalpulsar.PulsarDopplerParams(Fstat_signal.data[0].Doppler)
doppler.fkdot[0] = fsmin
# search SFTs using F-statistic
Fstat_res = lalpulsar.ComputeFstat(Fstat_res, Fstat_input, doppler, Nfs,
lalpulsar.FSTATQ_2F)
return Fstat_res.twoF