Accurate Azimuth from a Single PLGR+GLS DoD GPS Receiver Using Time Relative Positioning

Karl Ulmer, Patrick Hwang, Brent Disselkoen, and Mark Wagner

Abstract:	A new application of the Precision Lightweight GPS Receiver (PLGR) incorporates a proprietary technique called Time Relative Positioning to obtain highly accurate azimuth and pitch information. This technique is currently employed in the PLGR+GLS (Gun Laying System) to determine the 3-dimensional vector representing the relative horizontal and vertical displacement between two points marked by the receiver. In addition to providing a cost-efficient method for deriving a precision gun sighting vector, the PLGR+GLS demonstrates one to three mil accuracy on the resulting azimuth measurement. The Time Relative Positioning technique relies on kinematic based measurements and the careful calibration of known error sources to derive its azimuth and elevation measurements. Contrary to many kinematic applications, this result is derived completely internal to a single receiver. This paper addresses the application to gun laying methodology, kinematic survey and attitude determination requirements, known error sources and integration issues and presents an analysis of actual field test results. The incorporation of Time Relative Positioning into the PLGR product offers significant performance improvements in certain military gun laying environments. In addition, the autonomous nature of this attitude determination technique implies a broad range of future applications.
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:	1733 - 1741
Cite this article:	Ulmer, Karl, Hwang, Patrick, Disselkoen, Brent, Wagner, Mark, "Accurate Azimuth from a Single PLGR+GLS DoD GPS Receiver Using Time Relative Positioning," 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. 1733-1741.
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