Geodetic Point Positioning with GPS (Global Positioning System) Carrier Beat Phase Data from the CASA UNO Experiment.

摘要

The Global Positioning System (GPS) carrier beat phase data collected by the T14100 GPS receiver has been sucessfully utilized by the US Defense Mapping Agency in an algorithm which is designed to estimate individual absolute geodetic point positions from data collected over a few hours. The algorithm uses differenced data from one station and two to four GPS satellites at a series of epochs separated by 30 seconds intervals, The 'precise' GPS ephemerides and satellite clock states, held fixed in the estimation process, are those estimated by the Naval Surface Warfare Center (NSWC). Broadcast ephemerides and clock states are also utilized for comparative purposes. An outline of the applied data corrections, the mathematical model and the estimation algorithm are present. Point positioning results and statistics are presented for a globally-distributed set of stations which contributed to the CASA UNO experiment. Keywords: Geodesy; Point positioning; Satellite geodesy. (JES)