Accession Number : ADA485236


Title :   Global Positioning System Constellation Clock Performance


Descriptive Note : Conference paper


Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC


Personal Author(s) : Oaks, Jay ; Largay, Marie M. ; Reid, Wilson G. ; Buisson, James A.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA485236


Report Date : DEC 2002


Pagination or Media Count : 13


Abstract : An overview of the Global Positioning System (GPS) constellation with respect to the lifetimes of space vehicles and space vehicle clocks, both active and deactivated, is presented. Analysis of clock performance with respect to frequency stability is reviewed. The operational Navstar timing signals are ranked according to frequency stability for a sample time of 1 day. In addition, the performance of the Block IIR clocks is compared to that of two flight-qualified Block IIR rubidium atomic frequency standards undergoing life tests in the NRL Precision Clock Evaluation Facility. This work was performed under the sponsorship of the GPS Joint Program Office.


Descriptors :   *GLOBAL POSITIONING SYSTEM , *CONSTELLATIONS , *CLOCKS , FREQUENCY STABILIZERS , RUBIDIUM , SPACECRAFT , SYMPOSIA


Subject Categories : TEST FACILITIES, EQUIPMENT AND METEORS
      NAVIGATION AND GUIDANCE


Distribution Statement : APPROVED FOR PUBLIC RELEASE