Budget Analysis and Realization of Precise RTK-GPS Via Compact Correction Messages Applied to Commercial GPS Receivers

Jeonghan Kim, Byungwoon Park, Changdon Kee, Allen Cleveland, Michael Parsons and David Wolfe

Abstract:	The SNUR-2000 v. 2.2 consists of several types of compact RTK-GPS messages whose main components are pseudorange and carrier phase corrections. Using these messages, we can carry out precise RTK-GPS positioning using low-rate data-link. In this paper, we analyze the effect of latency on RTK-GPS positioning error and determine minimum baud-rate of data-link for compact correction messages applied to commercial GPS receivers. We also evaluate the performance of the SNUR-2000 by applying converted correction messages to commercial GPS receivers. Commercial GPS receivers can identify their own proprietary RTK-GPS messages, but not the correction messages of the SNUR-2000 v. 2.2. In order to make RTK-GPS receivers identify the SNUR-2000 messages, we converted the compact correction data to proprietary RTK-GPS data which commercial GPS receivers can identify. For this purpose, we converted compact correction messages to CMR (Compact Measurement Records), which is one of the widely-known RTK-GPS data format. The RTK-GPS receivers decode the converted messages, estimate DD integer ambiguities, then compute RTK-GPS position internally. Test results show that the converted compact correction messages of the SNUR-2000 make it possible to resolve integer ambiguities and to compute precise RTK-GPS position autonomously without performance degradation (Initial test results have been demonstrated in the plenary meeting of the RTCM SC-104 version 3 working group).
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1460 - 1467
Cite this article:	Kim, Jeonghan, Park, Byungwoon, Kee, Changdon, Cleveland, Allen, Parsons, Michael, Wolfe, David, "Budget Analysis and Realization of Precise RTK-GPS Via Compact Correction Messages Applied to Commercial GPS Receivers," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1460-1467.
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