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LISA data analysis I: Doppler demodulation

Neil Cornish·Shane Larson
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Abstract

The orbital motion of the Laser Interferometer Space Antenna (LISA) produces amplitude, phase and frequency modulation of a gravitational wave signal. The modulations have the effect of spreading a monochromatic gravitational wave signal across a range of frequencies. The modulations encode useful information about the source location and orientation, but they also have the deleterious affect of spreading a signal across a wide bandwidth, thereby reducing the strength of the signal relative to the instrument noise. We describe a simple method for removing the dominant, Doppler, component of the signal modulation. The demodulation reassembles the power from a monochromatic source into a narrow spike, and provides a quick way to determine the sky locations and frequencies of the brightest gravitational wave sources.

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Neil Cornish, Shane Larson. 2002-06-13. LISA data analysis I: Doppler demodulation. https://doi.org/10.1088/0264-9381%2F20%2F10%2F319

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