Accession Number : ADP009102

Title :   GPS Common - View Time Transfer,

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

Personal Author(s) : Lewandowski, W.

Report Date : 02 DEC 1993

Pagination or Media Count : 15

Abstract : The introduction of the GPS common-view method at the beginning of the 1980s led to an immediate and dramatic improvement of international time comparisons. Since then further progress brought the precision and accuracy of GPS common-view intercontinental time transfer, from tens of nanoseconds to a few nanoseconds, even with SA activated. This achievement was made possible, mainly by the use of ultra-precise ground antenna coordinates, post-processed precise ephemerides, double-frequency measurements of ionosphere, and appropriate international coordination and standardization. This paper reviews developments and applications of the GPS common-view method during the last decade and comments on possible future improvements, whose objective is to attain sub-nanosecond uncertainty.

Descriptors :   *GLOBAL POSITIONING SYSTEM, *TIME STANDARDS, COMPARISON, COORDINATES, EPHEMERIDES, INTERNATIONAL, IONOSPHERE, MEASUREMENT, PAPER, PRECISION, STANDARDIZATION, TIME, UNCERTAINTY, FRANCE, FREQUENCY MULTIPLIERS.

Subject Categories : Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE