Interference Direction Finding for Aviation

Konstantin Gromov, Dennis Akos, Sam Pullen, Per Enge, and Bradford Parkinson

Abstract:	The Local Area Augmentation System(LAAS) is being de-veloped by the US Federal Aviation Administration (FAA) to provide satellite navigation performance compliant with the stringent requirements for aircraft precision approach and landing. A primary design goal for LAAS is to in-sure that failures occurring in the ground or space segments be eliminated by the ground system before differential cor-rections are broadcast to users. One such failure is unin-tentional interference or intentional jamming in the GPS frequency band. To protect availability, ground person-nel must also be able to locate and disable the interference source. To serve this purpose, the LAAS Ground Facility may well include an Interference Direction Finder (IDF). The IDF can improve LAAS availability by rapidly and accurately estimating the location of the source. IDF activities are implemented in parallel with reference receiver functions and may share components with the reference receivers and processors in existing LAAS prototypes. This paper focuses on interference direction finding us-ing interferometry. Given an undesired interference sig-nal, measuring the signal propagation delay along the base-line between two antennas is used to estimate the direction of the signal. Measurements from the multiple baselines present in the LAAS Ground Facility are combined to esti-mate the location of the undesired signal transmitter. The paper describes the Stanford Prototype IDF receiver design and presents experimental results that demonstrate the use of the IDF to detect nominal GPS signals and deter-mine the source of interfering signals.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	115 - 124
Cite this article:	Gromov, Konstantin, Akos, Dennis, Pullen, Sam, Enge, Per, Parkinson, Bradford, "Interference Direction Finding for Aviation," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 115-124.
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