Analysis of GPS Performance Under Jamming and NOE Flight Environments

Van Tran, Paul Olson, David Wirkkala, Kathy Velick, Prasun Sinha, D. DeDoes

Abstract:	The DOD’S GPS receivers must be capable of providing accurate and reliable navigation information under stressed battlefield conditions. For Army Nap-of-the-Earth @JOE) users, this includes situations where satellites are often terrain masked due to low altitude operation and the presence of jamming. While NOE flight may cause GPS satellite outages to degrade navigation accuracy, it may also benefit accuracy by masking jamming signals. NOE operations can be further enhanced by: (1) integrating GPS with other sensors such as an INS and altimeter, (2)increasing the number of receiver channels (relative to the current Dob standard receivers) and (3) enhancing the receiver’s anti-jam performance. This paper presents the results of a simulation study performed by US Army CECOM, C2SID. The simulation tool used in this study provides the capability to evaluate GPS/INS integrated system navigation performance under NOE flight conditions and jamming. The simulator incorporates a Defense Mapping Agency @MA) terrain data base, models for current and enhanced DOD receiver designs, an integrated GPS/INS model, and up to eight different jammers. As the simulated flight progresses, satellite signals and jammers are blocked and unblocked due to terrain masking. A trade-off analysis has been performed to show the impact of (1) GPS receiver anti-jam performance, (2) number of navigation channels, and (3) NOE flight conditions on integrated system navigation performance. Covariance analysis is used to predict both receiver and integrated system position and velocity accuracy.
Published in:	Proceedings of the 53rd Annual Meeting of The Institute of Navigation (1997) June 30 - 2, 1997 Albuquerque, NM
Pages:	407 - 417
Cite this article:	Tran, Van, Olson, Paul, Wirkkala, David, Velick, Kathy, Sinha, Prasun, DeDoes, D., "Analysis of GPS Performance Under Jamming and NOE Flight Environments," Proceedings of the 53rd Annual Meeting of The Institute of Navigation (1997), Albuquerque, NM, June 1997, pp. 407-417.
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