GPS Interference Sources Angle of Arrival Estimation Using an Adaptive Periodogram Technique

M. Brenneman, Y.T. Morton, Q. Zhou, and G. Distler

Abstract:	This paper presents a joint time-frequency method, the adaptive periodogram technique (APT) to determine interference source angle of arrival (AOA) using inputs from a GPS receiver front end. The most commonly AOA finding methods (such as MUSIC) are based on the eigenstructure of the spatial covariance matrix for an antenna array. Although this class of methods is very useful, it nevertheless has limitations. In situations where complicated signals occur, the number of interfering sources exceeds the number of array elements, or AOA ambiguities arise from sources with frequencies close to each other, eigenstructure methods do not perform well. The APT complements these existing eigenstructure methods and provides better performance under these conditions. APT is initiated through a FFT to estimate the frequencies of the interference signals present. For each frequency component, APT then estimates the optimal window location of coherent signal intervals and the corresponding phases of signals from each antenna. The phase information is then used to obtain the signal AOA. Because APT estimates the optimal time domain window, in principle, it can achieve the best possible AOA solutions. With APT, it is also possible to obtain performance measures because of its statistical analysis capability. Moreover, APT’s ability to statistically estimate the optimal time window improves the computation efficiency. The paper will present examples that compare the performances of APT with MUSIC.
Published in:	Proceedings of the 2007 National Technical Meeting of The Institute of Navigation January 22 - 24, 2007 The Catamaran Resort Hotel San Diego, CA
Pages:	398 - 404
Cite this article:	Brenneman, M., Morton, Y.T., Zhou, Q., Distler, G., "GPS Interference Sources Angle of Arrival Estimation Using an Adaptive Periodogram Technique," Proceedings of the 2007 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 2007, pp. 398-404.
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