NSSDCA ID: 1965-089A-04
Mission Name: GEOS 1The Sequential Collation of Range (SECOR) system operated by the Army Map Service (AMS) (now identified as ETR) was used for the spacecraft radio range system. A 3.6-kg transponder received and retransmitted ground radio signals. Ground-based equipment included phase-modulated transmitters, range-data receivers, and electronic phasemeters. The transponder provided valuable ranging data for four U.S. SECOR stations to make possible inter-comparison tests from December 29, 1965, to May 1, 1966. Inter-datum and inter-island ties were completed from Tokyo to Hawaii using data from SECOR tracking stations and other geodetic observations made between May 24, 1966, and February 8, 1967. During this latter time period, the system was also used in the first phase of establishing the SECOR equatorial belt. Early data were affected by noise, but all data received were considered valuable. The transponder failed on February 8, 1967.
Questions and comments about this experiment can be directed to: Coordinated Request and User Support Office
Name | Role | Original Affiliation | |
---|---|---|---|
Col J. S. McCall | Principal Investigator | US Army Office of the Chief Engineer |