To perform a gyro test of general relativity in a satellite and develop associated control technology

Details To perform a gyro test of general relativity in a satellite and develop associated control technology To perform a gyro test of general relativity in a satellite and develop associated control technology

Jul 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7810432f&link_type=abstract

Final Report Stanford Univ., CA. W. W. Hansen Lab. of Physics.

Physics

Experiment Design, Gyroscopes, Gyroscopic Stability, Pointing Control Systems, Relativity, Satellite Attitude Control, Aerodynamic Drag, Cryogenic Equipment, Magnetometers, Mission Planning, Readout, Telescopes

Scientific paper

A satellite configuration having two gyroscopes with axes parallel to the boresight of a telescope and two at right angles to the telescope and approximately parallel and perpendicular to the earth's axis is proposed for measuring geodetic precessions due to the earth's motion about the sun, higher order geodetic terms calculated from the earth's quadrapole mass moment (0.010 arc-sec/year in a 400 nautical mile polar orbit), and deflection by the sun of the starlight signal for the reference telescope. Data from the experiment also contain large periodic signals due to the annual and orbital aberrations of starlight which are useful in providing a built in reference signal of known amplitude for scaling the relativity signals, and should yield a singularly precise measurement of the parallax of the reference star. The development of the gyroscope and its readout system are discussed, as well as signal integration, drag-free control, and attitude control.

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