Anti-Jamming Performance of TIDGET In Guided Munltions Applications

Armando Montalvo, Bruce Johnson, and Alison Brown

Abstract:	Many guided munitions systems could benefit from the use of GPS position information to augment existing inertial navigation systems. Currently GPS is planned to be used on JDAM, other potential missile systems are, next generation of AMRAAM and Harpoon missiles. These applications however, are characterized by no pre-launch visibility of GPS satellites, short duration, and high launch dynamics, which preclude the use of conventional GPS receivers. Utilizing the TIDGET sensor, NAVSYS developed an innovative approach to GPS/lNS data fusion for these demanding applications that optimally combines GPS and INS data from both the launch platform and smart munitions. The advantages of this system include no initialization of GPS sensor pre- launch, rapid signal acquisition even in high dynamic environments (Time To First Fix < 1 set), and inherent differential operation. But perhaps the most surprising advantage is the improved anti- jamming performance when compared to even an ideal conventional receiver. An ideal conventional GPS receiver will provide a jamming margin of 43 DB for CIA codes and 53 DB for PN codes, assuming no quantization and sampling losses. Here we will show that the TIDGET sensor provides jamming margin of up to 70 DB for C/A codes and 68 DB for PN codes, for these applications, while still maintaining one meter PR accuracies. Here we present the system’s architecture with an analysis of the system performance and J/S margins.
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:	381 - 390
Cite this article:	Montalvo, Armando, Johnson, Bruce, Brown, Alison, "Anti-Jamming Performance of TIDGET In Guided Munltions Applications," 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. 381-390.
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