Trimble's Force 5 GPS Receiver Application Module

Ken Spratlin, Paul Turney and Randy Ristau

Abstract:	The Force 5 GRAM-S is an all-in-view, dual-frequency receiver providing the military Precise Positioning Service (PPS) capability. GRAM-S is the designation for an industry working group defined GPS Receiver Application Module (GRAM) in the Modified Standard Electronics Module (SEM) form factor intended primarily for military airborne applications. The receiver is additionally well suited for land, ship, missile, and space applications requiring high performance under severe military or aerospace environmental conditions. Functioning in either an integrated GPS/INS or GPS/Doppler configuration or as a stand-alone GPS receiver, the Force 5 provides precise position, velocity, and time (PVT) as well as line-of-sight pseudorange, delta range, and carrier phase measurement data corrected for Selective Availability (SA) and Anti-Spoofing (A-S). Extensive interfaces designed in accordance with GPS JPO standards are provided to support integration into retrofit airborne applications. Advanced features including Fast Direct Y-Code Acquisition, a high precision Time Maintenance capability, Fault Detection and Exclusion in accordance with RTCA/DO-229, carrier phase measurement capability, and high dynamics tracking capability are discussed. Test results of these features from an extensive Trimble internal qualification program are presented. These test results are based on "live" GPS signal tracking as well as simulated aircraft flight scenarios using GPS Signal Generators. Typical customer applications are also presented.
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:	355 - 362
Cite this article:	Spratlin, Ken, Turney, Paul, Ristau, Randy, "Trimble's Force 5 GPS Receiver Application Module," 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. 355-362.
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