The Ashtech G12-HDMA: A Low Cost, High Performance GPS Space Receiver

Lin Haas, Mohamed Abousalem and James Murphy

Abstract:	The Ashtech® G12-HDMA™ is a 12-channel GPS receiver developed for High Dynamics and Missile Applications. It has successfully flown on several Navy sea-launched test missiles, as well as on sounding rockets launched by NASA at its Wallops Island facility. The G12-HDMA is currently being integrated into the X-34 experimental reusable launch vehicle being developed by Orbital Sciences. Recent firmware modifications have also enabled the G12-HDMA to be used by low Earth orbiting spacecraft for navigation, timing, and precise orbit determination. In this paper, the performance of the G12-HDMA in a variety of missile, rocket, and spacecraft navigation tests are described. The missile and rocket tests utilized real GPS signals in real-time and post-processed navigation applications. The spacecraft tests utilized simulated GPS signals from a state-of-the-art GPS signal simulator. The test results include acquisition, tracking, and navigation performance.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	350 - 354
Cite this article:	Haas, Lin, Abousalem, Mohamed, Murphy, James, "The Ashtech G12-HDMA: A Low Cost, High Performance GPS Space Receiver," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 350-354.
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