""" Waveform approximants for the pre-merger detection of gravitational waves
"""
import logging
[docs]def premerger_taylorf2(**p):
""" Generate time-shifted TaylorF2"""
from pycbc.waveform import get_fd_waveform
from pycbc.waveform.spa_tmplt import spa_length_in_time
from pycbc.waveform.utils import fd_taper
p.pop('approximant')
hp, hc = get_fd_waveform(approximant="TaylorF2", **p)
removed = spa_length_in_time(mass1=p['mass1'],
mass2=p['mass2'],
f_lower=p['f_final'],
phase_order=-1)
hp = hp.cyclic_time_shift(removed)
hp.start_time += removed
hc = hc.cyclic_time_shift(removed)
hc.start_time += removed
logging.info("PreTaylorF2, m1=%.1f, m2=%.1f, fmax=%.1f, timeshift=%.1f",
p['mass1'], p['mass2'], p['f_final'], removed)
kmin = int(p['f_lower'] / p['delta_f'])
hp[0:kmin] = 0
hc[0:kmin] = 0
if 'final_taper' in p:
taper_size = p['final_taper']
hp = fd_taper(hp, p['f_final'] - taper_size, p['f_final'], side='right')
hc = fd_taper(hc, p['f_final'] - taper_size, p['f_final'], side='right')
hp.time_offset = removed
hc.time_offset = removed
return hp, hc