Accession Number : ADP009117

Title :   Cesium and Rubidium Frequency Standards Status and Performance on the GPS Program,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GREENBELT MD GODDARD SPACE FLIG HT CENTER

Personal Author(s) : Van Melle, M. J.

Report Date : 02 DEC 1993

Pagination or Media Count : 16

Abstract : This paper is an update of the on-orbit operational performance of the frequency standards on the Block I GPS 8 to 11 Navstar satellites, the Block 11 GPS 13 to 21 Navstar satellites and the Block IIA GPS 22 to 40 Navstar satellites. A brief history of the frequency standards depicting improvements incorporated in the GPS Program with corresponding results will be presented. The frequency standards configurations from the start to the present, including the various Block IIA clock configurations will be discussed. Topics such as clock observations and long term trending analysis which could enhance on-orbit performance analysis will be covered.

Descriptors :   *FREQUENCY STANDARDS, *NAVIGATION SATELLITES, CLOCKS, CONFIGURATIONS, HISTORY, OBSERVATION, EARTH ORBITS, RESEARCH MANAGEMENT.

Subject Categories : Navigation and Guidance
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE