HR: 1340h
AN: G53A-0103    [Abstracts]
TI: GPS Measurement Corrections for Geophysicists: A Calibration Experiment for C/A-P Code Biases
AU: * Choi, K
EM: choik@colorado.edu
AF: Aerospace Engineering Sciences Department, University of Colorado 429 UCB, Boulder, CO 80309 United States
AU: Larson, K M
EM: kristine.larson@colorado.edu
AF: Aerospace Engineering Sciences Department, University of Colorado 429 UCB, Boulder, CO 80309 United States
AB: The existence of pseudorange biases between the C/A and L1-code (P1) has been recognized for several years. Although pseudorange is a secondary data type for geophysicists and geodesicists, the satellite dependent biases between the two pseudorange observables, C/A and P1, can affect the carrier phase ambiguity resolution as well as timing errors. We report results of several experiments conducted to accurately determine pseudorange biases. In the first case, we use receivers that report both C/A and P1, and average the observations over a day to estimate satellite specific bias es. In this way, we are able to evaluate the long-term stability of the transmitter biases, and compare results between different receivers. Many receivers record C/A or P1, but not both. To evaluate possible receiver specific biases for these units, we conducted zero-baseline experiments. We evaluate the accuracy of the pseudorange bias estimates by assessing abmiguity resolution results with and without these corrections.
DE: 1200 GEODESY AND GRAVITY
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting