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Acta Armamentarii ›› 2016, Vol. 37 ›› Issue (4): 661-669.doi: 10.3969/j.issn.1000-1093.2016.04.013

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Multichannel Radar Signal Recognition Algorithm Based on DCS

WANG Hong-wei1, FAN Xiang-yu2, CHEN You2, YANG Yuan-zhi2   

  1. (1.School of Electronic and Information, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China;2.Aeronautics and Astronautics Engineering College, Air Force Engineering University, Xi’an 710038, Shaanxi, China)
  • Received:2015-07-16 Revised:2015-07-16 Online:2016-06-20
  • Contact: WANG Hong-wei E-mail:hww0818@163.com

Abstract: Recognizing the radar signal in complex electromagnetic environment is the necessary prerequisite for electronic countermeasures to play a role. The priori information about signal modulation and signal parameter is limited, which cannot provide enough intelligence support for signal sorting. In addition, the mixture of signals restricts the effectiveness of signal sorting. The issue mentioned above is converted to a blind source separation. A high-order disjunction matrix is established with Givens transform, and the blind source separation algorithm with degree of cyclostationarity (DCS) based on the third-order cyclic statistics which is suitable for two channel signals is expanded to the multichannel signals with different cyclostationarity frequencies. The feasibility of the proposed method is proved by theoretical derivation, and the method for establishing the parameters of Givens matrix is derived. The features of radar signal in cyclostationary domain are extracted with cyclostationarity theory. The method is simulated with DCS separation principles. The simulated results show that the algorithm can realize the effective sorting of multichannel radar signals.

Key words: radar engineering, signal recognition, cyclostationarity frequency, Givens matrix, DCS blind source separation algorithm, multichannel signal

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