Geodetic Point Positioning With GPS Carrier Beat Phase Data From the CASA UNO Experiment

Stephen Malys, Peter A. Jensen

Abstract:	The Global Positioning System (GPS) carrier beat phase data collected bv the ‘M4100 GPS receiver has .been successfully 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 &ellites at a series of epochs separated by 30 second 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 data corrections applied , the mathematical model and the estimation algorithm are presented. Point positioning results and statistics are presented for a globally-distributed set of stations which contributed to the CASA UN0 experiment. Statistical assessment of 114 GPS point positions at 11 CASA UN0 stations indicates that the overall standard deviation of a point position component, estimated from a few hours of data, is 73 centimeters. Solution of the long line geodetic inverse problem using repeated point positions such as these can potentially offer a new tool for those studying geodynamics on a global scale.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	101 - 105
Cite this article:	Malys, Stephen, Jensen, Peter A., "Geodetic Point Positioning With GPS Carrier Beat Phase Data From the CASA UNO Experiment," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 101-105.
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