Efficient Transmission Technique of Compact RTK Correction Messages for Low-rate RTK Data-link

Changdon Kee and Jeonghan Kim

Abstract:	Current RTK-GPS protocols like RTCM SC-104 v.2.3, 3.0(Draft 15) and Trimble CMR require at least 2400bps-bandwidth of RTK-GPS data-link. Unlike the RTK-GPS correction messages of the RTCM SC-104 v.2.3, those of the RTCM SC-104 version 3.0(Draft 15) and the Trimble CMR have optimized structures. But they neither consider the effect of latency on corrections, nor make full use of the S/A(Selective Availability) termination. In this paper, we propose new RTK-GPS correction messages compatible with the RTCM SC-104 version 3.0(Draft 15) and describe the efficient transmission technique of the proposed RTK-GPS correction messages. By taking full advantage of the compactness of the RTCM SC-104 v. 3.0(Draft 15) and lowering update rate of the RTK -GPS corrections, we can lower the required baud rate of RTK-GPS data-link up to 600 bps or less. Transmission periods of corrections can be much lengthened by S/A termination. In order to verify the above strategy, we performed RTK-GPS experiments with simulated low-rate RTK data-link(less than 600bps). We used the SNUR-2000 v. 2.2 as RTK-GPS protocol. Then, we evaluated the performance of the SNUR-2000 v. 2.2 and the efficient transmission technique of the RTK-GPS corrections.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	1361 - 1371
Cite this article:	Kee, Changdon, Kim, Jeonghan, "Efficient Transmission Technique of Compact RTK Correction Messages for Low-rate RTK Data-link," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 1361-1371.
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