Phase-coherent dual-frequency link for high-precision Doppler tracking between spacecraft

Details Phase-coherent dual-frequency link for high-precision Doppler tracking between spacecraft Phase-coherent dual-frequency link for high-precision Doppler tracking between spacecraft

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ssi.....3....3s&link_type=abstract

Space Science Instrumentation, vol. 3, Feb. 1977, p. 3-18. Research sponsored by the Smithsonian Astrophysical Observatory.

Astronomy and Astrophysics

Astrophysics

Data Links, Doppler Effect, Radio Receivers, Radio Tracking, Radio Transmitters, Spacecraft Tracking, Apollo Soyuz Test Project, Crystal Oscillators, Error Analysis, Instrument Errors, Mascons, Multipath Transmission, Phase Coherence, Signal Processing

Scientific paper

During the Apollo-Soyuz Test Project, a phase-coherent dual-frequency link was established between the Docking Module (DM) and the Apollo Command Service Module (CSM). The purpose of the radio link was to enable relative Doppler measurements to an accuracy of the order of one millihertz between the two models. These measurements will be used to detect mass concentrations (mascons) in the earth's crust of the order of 10 milligal and greater. The link operates at 162 and 324 MHz. The transmitter has a high stability master oscillator common to both channels. The receiver has a local oscillator with identical stability characteristics; its two channels employ phase-lock loops. The receiver includes a Doppler processor that generates digital words representing the information needed to extract and encode (for recording on two tape recorders) the desired data on the earth's gravity field. This paper describes the instrumentation system concept and its implementation. It also contains an error analysis of the deterioration of the Doppler accuracy due to various instrumental and propagation effects.

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