The Effect of Interference Power and Bandwidth on Space-Time Adaptive Processing

T.D. Moore, I.J. Gupta

Abstract:	The effect of interference power and bandwidth on space-time adaptive processing (STAP) performance is studied using an analytical model of STAP. A flat power spectral density representation of the interference, noise, and desired signals is used to generate closed form expressions of the exact array covariance matrices. It is shown that the STAP output INR oscillates as a function of interference power and bandwidth. This is similar to the effect experienced for a conventional adaptive array which has been reported in the past. In contrast, the STAP output SINR does not experience large degradation due to the interference power and bandwidth given that the interference is suppressed. Thus, STAP SINR performance is dissimilar to that of the conventional adaptive array. Additionally, the study will demonstrate that a finite bandwidth source consumes multiple degrees of freedom in STAP with wideband direct-path RFI consuming a minimum of N degrees of freedom where N is the number of taps per sensor. The number of degrees of freedom consumed are dependent on both the interference power and bandwidth. Moreover, it is possible for an interference signal which meets the narrow-band assumption for the conventional array (consuming a single degree of freedom) to consume multiple degrees of freedom in the STAP.
Published in:	Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003) June 23 - 25, 2003 Hyatt Regency Hotel Albuquerque, NM
Pages:	337 - 346
Cite this article:	Moore, T.D., Gupta, I.J., "The Effect of Interference Power and Bandwidth on Space-Time Adaptive Processing," Proceedings of the 59th Annual Meeting of The Institute of Navigation and CIGTF 22nd Guidance Test Symposium (2003), Albuquerque, NM, June 2003, pp. 337-346.
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