Accession Number : AD0718348

Title :   The Evolution of GEOS-C and the Radar Altimeter for Geodetic Measurements.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Kowal,S. J.

Report Date : MAY 1970

Pagination or Media Count : 30

Abstract : The geodetic series of satellites is traced from ANNA through GEOS-I and -II in terms of the geodetic experiments completed and proposed. The ANNA instruments included the use of four coherent frequencies for doppler tracking, a range transponder (SECOR), and flashing lights for optical beacons. GEOS-I had the ANNA instruments plus a range and range-rate transponder and laser corner reflectors. GEOS-II had all the GEOS-I instruments plus C-band radar transponders and a C-band passive tracking array. GEOS-C will have the GEOS-II experiments minus the SECOR and plus a unified S-band transponder, a satellite-to-satellite tracking experiment, and an X-band radar altimeter for measuring sea level at the subsatellite position. It is expected that the satellite-to-sea-level distance will be measured to an accuracy of 1 to 5 meters in this experiment. (Author)

Descriptors :   (*SCIENTIFIC SATELLITES, GEODESICS), (*RADIO ALTIMETERS, SCIENTIFIC SATELLITES), SYSTEMS ENGINEERING, SATELLITE TRACKING SYSTEMS, X BAND

Subject Categories : Geodesy
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE