HR: 11:50h
AN: G32A-06    [Abstracts]
TI: Impact of GPS Satellite Antenna Phase Center Variations and Modified Sidereal Filtering on Reference Frame Determination.
AU: * Owen, S E
EM: Susan.E.Owen@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109-8099
AU: Webb, F
EM: Frank.H.Webb@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109-8099
AB: Errors in the satellite and ground station antenna phase center variations are among the limiting sources of error in high precision GPS positioning. Recent determinations of phase-center variations (PCV) for both the transmitting satellite and receiving ground station antennas have shown promise for improving geodetic estimates of reference frame parameters, such as scale. While the PCV for the transmitting antennas is reasonably well determined and includes some variation from satellite to satellite, the apparent PCV at ground station antennas are likely to be site specific and dominated by local environmental effects, such as signal multipath. To mitigate these effects, we implement a modified sidereal filter (MSF). The MSF is applied as a correction to the phase and range data. The correction is based on stacking several days of phase and range residuals where each day is shifted by the actual orbital period of each satellite, rather than sidereal time. We will evaluate the effect of stacking several days to 1 month of residuals on such metrics as phase rms and point positioning repeatability. We will present an evaluation the impact of these PCV and MSF corrections on reference frame parameters. The corrections will be applied to several years of observations from a global set of IGS stations.
DE: 1229 Reference systems
DE: 1241 Satellite geodesy: technical issues (6994, 7969)
SC: Geodesy [G]
MN: Fall Meeting 2005