ION Technical Content
RTCM SC-104 Data Compression
| Abstract: | Every DGPS system operating in real-time requires a data link to carry range corrections generated at the reference station to the user. A message fonat for the range corrections and related data has been proposed by the RTCM Special Committee No. 104 and has become widely accepted. The most popular method of sending the RTCM messages over a DGPS data link to date has been to directly transmit the modulated RTCM data. Although easily implemented, this results in an inefficient use of the link since the RTCM format contains a large amount of redundancy. A more efficient usage can be obtained by first compressing the RTCM messages such that they can be perfectly reconstructed at the user receiver. New DGPS services can utilize data compression methods to obtain maximum efficiency of their data links. Existing systems, whose users expect the incoming broadcast to be directly modulated RTCM messages, can still use compression to their advantage, but to a lesser extent. The only way to obtain compression for these systems is to fit the compressed data into new message types at the cost of added overhead. This paper investigates various methods of compressing the RTCM data messages. Implementation and compatibility with existing service issues are covered. Additionally, the compression methods are evaluated based on their performance on a sample of actual RTCM data. |
| Published in: |
Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM |
| Pages: | 501 - 507 |
| Cite this article: | Hegarty, Christopher J., "RTCM SC-104 Data Compression," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 501-507. |
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