gwadama.detectors#

gwadama.detectors.project(h_plus: ndarray, h_cros: ndarray, *, parameters: dict, sf: int, nfft: int, detector: str) → ndarray[source]#

Project strain modes in a GW detector.

Project the input GW modes in the sky as detected by the specified detector using Bilby.

Parameters:

h_plus, h_crosNDArray

GW polarizations.

parametersdict

Sky position and time of the event, as requested by Bilby’s method:

``` {

ra: 0, dec: 0, geocent_time: 0, # In GPS. psi: 0 # Binary polarization angle

REF: https://lscsoft.docs.ligo.org/bilby/api/bilby.gw.detector.interferometer.Interferometer.html#bilby.gw.detector.interferometer.Interferometer.get_detector_response

sfint

Sample rate of the waveform.

nfftint

Length of the FFT window.

detectorstr

GW detector into which the modes will be projected. Must exist in Bilby’s InterferometerList().

Returns:

strains_projected: NDArray: Strain(s) projected. If only one detector specified, it is a 1d-array. Otherwise, a 2d-array with shape (3, strain).

Notes

Strains are converted to frequency domain in order to project them, and hence must be windowed.
Before the FFT, a Tukey window is used with alpha=0.04, therefore the initial length of the strains has to be taken into account since around 2% of the beginning and the end of the signal will be damped.