J4 ›› 2014, Vol. 41 ›› Issue (5): 67-73+134.doi: 10.3969/j.issn.1001-2400.2014.05.012

• Original Articles • Previous Articles     Next Articles

Method for detecting DRFM deception jamming based on LFM rate matching

LU Yunlong;LI Ming;YAN Yan   

  1. (National Key Lab. of Radar Signal Processing, Xidian Univ., Xi'an  710071, China)
  • Received:2013-05-21 Online:2014-10-20 Published:2014-11-27
  • Contact: LU Yunlong E-mail:yllu@stu.xidian.edu.cn

Abstract:

For detecting linear frequency modulated (LFM) active deception jamming, a novel approach is outlined based on LFM rate matching of the jamming harmonic components. Utilizing the harmonic effect generated from a digital radio frequency memory (DRFM), the feature of the harmonic spectrum is analyzed and an LFM rate base of the jamming is established first. Then the Fractional Fourier Transform (FrFT) is employed to detect LFM components in the radar echo when both the target echo and the jamming signal are co-existent in a range gate. After that the LFM rates of the detected LFM signal are estimated and compared with the LFM rate bank to achieve jamming detection. Validity of the method is verified by simulation results.

Key words: DRFM quantization, active deceptive jamming, FrFT, parameter estimate

CLC Number: 

  • TN974