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基于先驗信息的低信噪比調頻連續波雷達信號處理

Low SNR FMCW signal processing with prior information

  • 摘要: 針對惡劣測量條件下寬頻帶低信噪比調頻連續波雷達信號距離模糊問題,建立了固態料面調頻連續波雷達信號模型,并提出了以先驗信息為輔助,包含信號頻域預處理、頻帶截取及頻帶能量加權的距離反演方法.實際數據處理結果顯示:經過預處理的信號頻譜平均信噪比由原來的-5.55 d B提高到8.32 d B;采用包絡線截頻帶法和最小二乘截頻帶法進行距離反演后擬合料線與實際料線間的料形相似度由0.46分別提高到0.71和0.79.

     

    Abstract: A solid surface frequency modulated continuous wave (FMCW) radar signal model was built to solve the range ambiguity problem of wideband and low signal-to-noise ratio (SNR) FMCW signal under severe measurement conditions. Based on prior information, a distanee inversion method was proposed, which contained signal pretreatment, band intercepting, and energy weighting. Actual data processing results show that the SNR of the frequency spectrum rises from-5.55 to 8.32 dB after pretreatment. The index of similarity of the stock level shape increases from 0.46 to 0.71 and 0.79 by band envelope interception and least squares interception, respectively.

     

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