LISA as a xylophone interferometer detector of gravitational radiation

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Gravitational Wave Detectors And Experiments, Gravitational Radiation Detectors, Mass Spectrometers, And Other Instrumentation And Techniques

Scientific paper

A filtering technique, for reducing the frequency fluctuations of the laser entering into the two-way Doppler tracking data measured with two spacecraft, is discussed. This method takes advantage of the sinusoidal behavior of the transfer function of this noise source to the Doppler observable, which displays sharp nulls at selected Fourier components. The non-zero gravitational wave signal remaining at these frequencies makes spacecraft to spacecraft laser Doppler tracking the equivalent of a xylophone interferometer detector of gravitational radiation. The data analysis technique presented in this paper could be implemented with the LISA mission at the Fourier frequencies where the algorithm for unequal-arm interferometers fails to work, or as a backup option in case of failure of one of the three spacecraft.

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