LISA phase measurement technique

Martin R. Marcin

doi:10.1117/12.461497

26 February 2003 LISA phase measurement technique

Martin R. Marcin

Proceedings Volume 4856, Gravitational-Wave Detection; (2003) https://doi.org/10.1117/12.461497
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The LISA mission will form the equivalent of a Michelson interferometric beat signal from the 1064nm laser beams traversing the inter-spacecraft arms. The design gravitational wave sensitivity requires measurement of round trip path differences for each detector to be about 10 pm/square rootHz over a frequency range from 10-4 to 10-1 Hz. Thus LISA's phasemeter must measure the beat signal phase to 10-5 cycle/square rootHz at 1mHz. Doppler shifts between spacecraft in their orbits are expected to range from 1 to 15 MHz. Phase measurement using the digital phase-locked loop approach incorporated in a modified TurboRogue GPS receiver has been investigated in this study. It is found that only resolution in the range of 10-4 to 10-3 cycle/square rootHz at 1 mHz is achievable with this hardware. Abrupt fluctuations in the phase measurement at the millicycle level are responsible for the limitation.

Citation Download Citation

Martin R. Marcin "LISA phase measurement technique", Proc. SPIE 4856, Gravitational-Wave Detection, (26 February 2003); https://doi.org/10.1117/12.461497

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