NSSDCA ID: 1965-089A-03
Mission Name: GEOS 1The Doppler technique of timing and measuring the frequency shift of radio transmissions from a moving spacecraft was used to help establish the structure of the earth's gravitational field to an accuracy of approximately five parts in 100 million. Three transmitters were operated on frequencies of 162, 324, 972 MHz. Timing markers (bursts of 60-deg phase modulation) of 0.3-s duration once each minute were carried by the 162- and 324-MHz transmitters. Synchronization of the markers was to an accuracy of 0.4 ms. The system began operating during November 1965. The 972-MHz Doppler operated until January 14, 1967, when an intermittent command system response caused a permanent turn-off. The two lower frequency beacons operated continuously until December 1967, when operations became intermittent and progressively weaker. Operations were terminated on January 15, 1968.
Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
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Dr. Richard J. Anderle | Principal Investigator | US Naval Surface Weapons Center |