Comparison of Different Proposals for Reference Station Network Information Distribution Formats

H.-J. Euler, B. E. Zebhauser, B. R. Townsend, and G. Wuebbena

Abstract:	Reference station networks have been already installed in several countries over the last years. The exchange in these installations is still based on proprietary information messages. The need for a standardized information exchange has been understood right from the early beginning. So far two different proposals have been discussed and are in discussion at RTCM for adoption and inclusion in the standard. The first proposal has been drafted in 1999 by T. Melgård et al. A revised version was published by B. Townsend et al at ION GPS 2000. This proposal concentrates on keeping the message size small by transmitting only the minimum information required to correct the data from one reference station for the differential atmospheric and orbit errors experienced by the rover receiver. The second proposal has been drafted during the ION GPS 2001 in Salt Lake City by Euler et al. While most proprietary information exchange within RTK networks is based on estimated and modeled biases, this proposal is based on differences of RTCM correction messages. Therefore only unmodelled information is being distributed. The impediment of detailed descriptions and negotiations of used modeling procedures is bypassed for reaching easier agreement on the standard document. The paper will focus on the different proposals and weight their advantages and disadvantages. The paper's goal is a consolidated joint proposal for closing the discussions and speeding the adoption process for RTCM.
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:	2349 - 2358
Cite this article:	Euler, H.-J., Zebhauser, B. E., Townsend, B. R., Wuebbena, G., "Comparison of Different Proposals for Reference Station Network Information Distribution Formats," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 2349-2358.
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