The Cassini gravitational wave experiment

Doppler tracking experiments using the earth and a distant spacecraft as separated test masses have been used for gravitational wave (GW) searches in the low-frequency band(~0.0001-0.1 Hz). The precision microwave tracking link continuously measures the relative dimensionless velocity, Δv/c, between the earth and the spacecraft. A GW incident of the systems produces a characteristic signature in the data, different from the signatures of the principal noises. For 40 days centered about its solar opposition in December 2001, the Cassini spacecraft was tracked in a search for low-frequncy GWs. Here we describe the GW experiment, including transfer functions of the signals and noises to the Doppler observable, and present noise statistics and compare them with the pre-experiment noise budget.

[1]  J. Anderson,et al.  Spacecraft-Doppler gravity-wave detection. II - Results , 1981 .

[2]  H. Wahlquist.  The Doppler response to gravitational waves from a binary star source , 1987 .

[3]  Gravitational waves from coalescing binaries and Doppler experiments. , 1998, gr-qc/9806021.

[4]  Hugo D. Wahlquist,et al.  Response of Doppler spacecraft tracking to gravitational radiation , 1975 .

[5]  A. L. Riley,et al.  The Media Calibration System for Cassini Radio Science: Part II , 2001 .

[6]  T. Y. Otoshi,et al.  A microwave performance calibration system for NASA's deep space network antennas, part 2 : Holography, alignment, and frequency stability , 1997 .

[7]  Luciano Iess,et al.  Search for Gravitational Wave Trains with the Spacecraft ULYSSES , 1994 .

[8]  John W. Armstrong,et al.  Spacecraft Doppler Tracking as a Narrow-Band Detector of Gravitational Radiation , 1998 .

[9]  J. Anderson,et al.  Pioneer 10 search for gravitational waves—no evidence for coherent radiation from Geminga , 1984, Nature.

[10]  J. Armstrong,et al.  A search for sinusoidal gravitational radiation in the period range 30-2000 seconds , 1987 .

[11]  T. Y. Otoshi,et al.  DSS-13 Beam Waveguide Antenna Frequency Stability , 1992 .

[12]  Luciano Iess,et al.  Doppler tracking of spacecraft with multi-frequency links , 1993 .

[13]  J. Anderson,et al.  Doppler measurement of the solar gravitational deflection , 1999 .

[14]  P. J. Napier,et al.  Radiometric correction of atmospheric path length fluctuations in interferometric experiments. [in radio astronomy] , 1984 .

[15]  Spacecraft gravitational wave experiments , 1989, Proceedings of the 43rd Annual Symposium on Frequency Control.

[16]  J. Armstrong,et al.  Interplanetary phase scintillation and the search for very low frequency gravitational radiation , 1979 .

[17]  J. W. Armstrong,et al.  Observations of tropospheric phase scintillations at 5 GHz on vertical paths , 1982 .

[18]  M. Tinto.  The CASSINI Ka-band gravitational wave experiments , 2002 .

[19]  Radio wave phase scintillation and precision Doppler tracking of spacecraft , 1998 .

[20]  S. J. Keihm.  Water Vapor Radiometer Measurements of the Tropospheric Delay Fluctuations at Goldstone Over a Full Year , 1995 .