Systems Engineering and Electronics ›› 2024, Vol. 46 ›› Issue (10): 3312-3324.doi: 10.12305/j.issn.1001-506X.2024.10.09

• Sensors and Signal Processing • Previous Articles    

Interrupted-sampling repeater jamming suppression based on STFrFT

Jinjie LI1, Yunhe CAO1,*, Yulin ZHANG1, Meng WANG2   

  1. 1. National Laboratory of Radar Signal Processing, Xidian University, Xi'an 710071, China
    2. Beijing Electro-Mechanical Engineering Institute, Beijing 100074, China
  • Received:2023-04-14 Online:2024-09-25 Published:2024-10-22
  • Contact: Yunhe CAO

Abstract:

Jammers can rapidly slice and forward radar pulse to form interrupted-sampling repeater jamming. If it enters from the main lobe of radar, it will pose a serious threat to radar target detection. Starting from waveform design and time-frequency analysis, a main lobe interrupted-sampling repeater jamming suppression method is proposed based on short-time fractional Fourier transform (STFrFT). Firstly, an intra-pulse frequency agility signal is harnessed to improve the distinguishability between jamming and target signal.Moreover, the STFrFT is applied to time-frequency analysis, which significantly improves the time-frequency analysis accuracy compared with traditional short-time Fourier transform methods and removes the restrictions on signal parameters compared with fractional Fourier transform methods. Finally, through eliminating jamming by using image processing methods, the interference of high jamming-to-signal ratio from the main lobe of radar is suppressed effectively. The simulation results indicate that the proposed method can effectively suppress interrupted-sampling repeater jamming in various environments.

Key words: interrupted-sampling repeater jamming, short-time fractional Fourier transform (STFrFT), image processing, frequency agility

CLC Number: 

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