Differential GPS-Tests with L1 C/A-Code Receivers

Karl F. Borcherding Jr., Dieter Bultmann

Abstract:	Since the DOD plans to degrade the accuracy granted to civil users differential technics have become increasingly important. This paper reports on differential tests with the PS 84001 a sequential Ll C/A-Code receiver, with online and offline differential corrections in an attempt to study differential GPS. Offline corrections were performed by using position corrections in geographic coordinates and applying them to the collected data while all receivers involved used the same satellites. Problems of finding the right transformation from WGS 84 to a local system in order to establish local reference points are mentioned. Online corrections were performed using the recommended RTCM protocol broadcast via a speech channel. Tests were performed in a car and an airplane. The observed influence and implication of signal shading is discussed. Some long distance (several hundred "kilometers) point to point tests were performed in an attempt to find out the influences of the atmosphere using the Ll frequency only.
Published in:	Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988) September 19 - 23, 1988 The Broadmoor Hotel Colorado Spring, CO
Pages:	79 - 84
Cite this article:	Borcherding, Karl F., Jr., Bultmann, Dieter, "Differential GPS-Tests with L1 C/A-Code Receivers," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 79-84.
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