Burst Error Correction for a Medium Frequency Broadcast of Differential GPS Data

Dorothy C. Poppe

Abstract:	Civilian users of GPS will have access to the Standard Positioning servi.ce, limited to 100 me-ter accuracy by Selective Availability. Through Differclrtial CPS, corrections determined from data received at known localions are transmit-ted to users. Important to the transmission arc accuracy :ii~d the timeliness of the data which begins losing its value after about 10 seconds. Use of the medium frequency (285-325 kIlz) band maritime radiobeacons has been explored by the US Coast Guard. Signals from these DGPS/radiobeacons will propagate to ranges significant relative to the decorrelation distance of the DGPS corrections. Eventually the range is limited by atmospheric noise. The use of a dual-mode Viterbi decoder has been explored to determine its performance in recovering data from the bursty noise gj;;ylent in the DGPS/radiobcacon Descriptions are given of the Viterbi algorithm and an enchanced Viterbi algorithm with burst-error correction capabilities. The results obtained from testing the Viterbi decoder, both with and without burst capability, using botter simulated random noise channels and “off-air” bursty noise channels are presented.
Published in:	Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991) September 11 - 13, 1991 Albuquerque, NM
Pages:	925 - 936
Cite this article:	Poppe, Dorothy C., "Burst Error Correction for a Medium Frequency Broadcast of Differential GPS Data," Proceedings of the 4th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1991), Albuquerque, NM, September 1991, pp. 925-936.
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