HR: 1340h
AN: G53A-0120    [Abstracts]
TI: Estimating GPS Satellite Antenna Phase Center Variations Using Data from the Jason-1 and GRACE Missions
AU: Desai, S D
EM: Shailen.D.Desai@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Bar-Sever, Y
EM: Yoaz.Bar-Sever@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Bertiger, W
EM: Willy.Bertiger@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: * Haines, B
EM: Bruce.Haines@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Nerem, S
EM: nerem@ccar.colorado.edu
AF: Colorado Center for Astrodynamics Research, University of Colorado, Campus Box 431, Boulder, C0 80309 United States
AU: Morken, D
EM: morken@colorado.edu
AF: Colorado Center for Astrodynamics Research, University of Colorado, Campus Box 431, Boulder, C0 80309 United States
AB: Reducing the uncertainty in locating the phase centers on both GPS transmitter and receiver antennas has emerged as an area of active research in the GPS geodetic community. We have used on-orbit data from the Jason-1 (2001-) and GRACE (2002-) missions to develop estimates of GPS satellite antenna phase-center variations (PCV). These missions offer a number of advantages for this exercise. The heights of the Jason-1 and GRACE satellites are well-determined at the 1-2 cm level, and there is no troposphere signal to confound interpretation of the measurements. The multipath environments are also favorable, particularly for the GRACE mission. We discuss several strategies for determining the GPS satellite PCV estimates from these data, and describe evaluations of the candidate solutions using independent data from terrestrial GPS stations. We also compare our GPS satellite PCV estimates with those determined independently from a terrestrial network. These estimates have potential benefits for wide-ranging geodetic applications.
DE: 1241 Satellite orbits
DE: 1243 Space geodetic surveys
DE: 1294 Instruments and techniques
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting