Verification of USCG DGPS Broadcast Parameters

Mark Lunday, Joseph Spalding, and Marylouise Dowd

Abstract:	This report presents the results of performance tests conducted on several state-of-the-art Differential Global Positioning System (DGPS) Minimum-Shift-Keyed (MSK) receivers under varying conditions. Previous papers have theorized that spedk data rates and RTCM SC-104 message types will produce greater data throughput and thus better navigational solution accuracies, particularly in the presence of atmospheric noise. The purpose of this effort was to determine the capability of commercially available receivers with regard to proposed USCG DGPS broadcast parameters; additionally, the tests attempted to validate theorized optimal broadcast parameters (message type and speed) with regard to static noise and canietijammer interference. The performance testing, conducted at the U.S. Coast Guard (USCG) Research and Development Center @DC) in Groton, CT, was done in three phases. In the 5rst phase, the MSK receivers were tested under real-time atmospheric noise conditions. In the second phase of testing, DGPS corrections of various ages were received to determine throughput as a function of correction latency. In the third phase, the receivers were tested in the presence of a controlled CW carrier fimctioning as an interference/jamming source. Performance was quantized for each of the phases, which resulted in a collection of performance data that was correlated to atmospheric noise and interfering CW signal strength and frequency.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	889 - 897
Cite this article:	Lunday, Mark, Spalding, Joseph, Dowd, Marylouise, "Verification of USCG DGPS Broadcast Parameters," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 889-897.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In