Analysis of Algorithms for GPS Interferer Direction Finding

Shih-Chieh Leung, Raymond DiEsposti, Casey Giron, and Ira Weiss

Abstract:	The general GPS (Global Positioning System) interferer direction finding problem concerns finding the number of interference emitters and their directions. Two algorithms, MUSIC (Multiple Signal Classification) and PRIME (Polynomial Root Intersection for Multidimensional Estimation), are applied to this problem. A two dimensional planar array antenna with seven elements is used in this study. The algorithms can operate on either pre-correlation phase measurements (for the case of the strong signal) or post correlation phase measurements, derived from the carrier tracking loop (for the case of the weak signal). The entire antenna array is used in the development of the polynomials in the PRIME method formulation to filly utilize the information sources and to maximize the number of emitters to be detected. The final direction determination is selected from the candidate angles resulting from solving the polynomial equations. The angle selection is then based on the angular resolution requirement and the acceptable level of quantization errors. Results from this study have shown that these methods have the potential for detecting multiple emitters within one tenth of the antenna beamwidth.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	339 - 347
Cite this article:	Leung, Shih-Chieh, DiEsposti, Raymond, Giron, Casey, Weiss, Ira, "Analysis of Algorithms for GPS Interferer Direction Finding," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 339-347.
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