Receiver Autonomous Interference Detection

Awele Ndili and Per Enge

Abstract:	Interference presents a challenge in the use of GPS for aircraft high precision approach, by posing a threat to the accuracy and integrity of the GPS navigation solution. Such interference may result from ‘unintentional’ sources (such as TV/FM harmonics, Radar, MSS), or may result from hostile (jamming) efforts. This research focuses on algorithms for on-board interference detection and monitoring. Types of interference considered include CW and broadband, pulsed and continuous. We study the effects of different types of interference on GPS receiver subunits, including the A/D converter, correlator measurements, the PLL and the DLL. From analysis and simulation we present interference detection algorithms based on the observable effects of the various types of interference on the GPS receiver raw measurements. Interference detection is based on a combination of the following test statistic - cot-relator power output, variance of cot-relator power output, carrier phase vacillation, and AGC control loop gains. The role and benefits of pseudolites in reducing the adverse effects of interference are also discussed.
Published in:	Proceedings of the 53rd Annual Meeting of The Institute of Navigation (1997) June 30 - 2, 1997 Albuquerque, NM
Pages:	79 - 88
Cite this article:	Ndili, Awele, Enge, Per, "Receiver Autonomous Interference Detection," Proceedings of the 53rd Annual Meeting of The Institute of Navigation (1997), Albuquerque, NM, June 1997, pp. 79-88.
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