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WANG Xiaojun,XUE Linbo,WANG Yanpeng.Research on impulse interference suppression method based on short time fractional Fourier transform[J].Journal of Hebei University of Science and Technology,2021,42(1):15-21
基于STFRFT的脈沖干擾抑制方法研究
Research on impulse interference suppression method based on short time fractional Fourier transform
Received:September 28, 2020  Revised:November 05, 2020
DOI:10.7535/hbkd.2021yx01003
中文關鍵詞:  信號檢測  STFRFT  脈沖干擾抑制  最佳階次  坐標旋轉  時變濾波器
英文關鍵詞:signal detection  STFRFT  impulse interference suppression  optimal order  coordinate rotation  time-varying filter
基金項目:國防科技重點實驗室項目(6142205190401)
Author NameAffiliationE-mail
WANG Xiaojun School of Information Science and Engineering,Hebei University of Science and Technology, Shijiazhuang  
XUE Linbo School of Information Science and Engineering,Hebei University of Science and Technology, Shijiazhuang 2434290841@qq.com 
WANG Yanpeng School of Information Science and Engineering,Hebei University of Science and Technology, Shijiazhuang  
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中文摘要:
      為了解決航空無線電導航服務頻段附近的脈沖干擾影響接收機工作的問題,并進一步提高GNSS系統的抗干擾能力,提出了基于STFRFT(short time fractional Fourier transform)的脈沖干擾抑制方法。首先確定接收信號的最佳旋轉階次,再對信號進行STFRFT,通過坐標旋轉得到時頻面的二維分布,在最佳階次下采用自適應時變濾波器實現對干擾和信號的分離,進而抑制干擾。仿真結果表明,和幾種傳統方法相比,基于STFRFT的自適應濾波算法剔除干擾效果最好,在抑制脈沖干擾的同時保留了更多有用信號。結合STFRFT技術和自適應時變濾波技術提高了抑制脈沖干擾的能力,可為航空無線電導航服務的脈沖抗干擾技術提供參考依據。
英文摘要:
      In order to solve the problem that the impulse interference near the service frequency band of aviation radio navigation affects the receiver, and further improve the anti-jamming ability of GNSS system, a impulse interference suppression method based on STFRFT (short time fractional Fourier transform) was proposed. The optimal rotation order of the received signal was determined, and STFRFT was applied to the signal to obtain the two-dimensional distribution of time-frequency surface through coordinate rotation. Under the optimal order, the adaptive time-varying filter was used to separate the interference and the signal, so as to suppress the interference. The simulation results show that the adaptive filtering algorithm based on STFRFT has the best effect of eliminating interference compared with several traditional methods, and retains more useful signals while suppressing impulse interference. By combining STFRFT and adaptive time-varying filtering technology, the ability of suppressing impulse interference is improved, which provides some reference for the impulse anti-jamming technology of aviation radio navigation service.
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