一種基于瞬時相位方差加權的線譜檢測器
doi: 10.11999/JEIT141347 cstr: 32379.14.JEIT141347
基金項目:
國家自然科學基金(61372180)和中國科學院聲學研究所青年人才領域前沿項目
Weighted Line Spectrum Detector Based on Instantaneous Phase Variance
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摘要: 針對水下目標未知線譜的檢測問題，依據水下目標輻射噪聲含有高強度穩(wěn)定線譜這一特征，該文提出一種基于瞬時相位方差加權的線譜檢測方法。該方法利用目標線譜頻率單元對應瞬時相位比較穩(wěn)定，背景噪聲頻率單元對應瞬時相位比較隨機的特點，對各頻率單元進行瞬時相位方差加權，可以進一步抑制背景噪聲能量干擾，增強目標線譜檢測信噪比(SNR)增益，實現對水下目標輻射噪聲中未知線譜的檢測。理論分析和實驗結果表明：該方法可以較好地增強目標線譜能量、抑制噪聲、提高信噪比，在抗復雜信道檢測、識別領域具有良好的應用前景。Abstract: According to the feature that the underwater target radiated noise contains high intensive and stable line spectrum, a weighted line spectrum detection method based on the instantaneous phases variance is proposed with regard to the problem of unknown line spectrum detection. This method utilizes the characteristic that the instantaneous phase of target line spectral frequency unit being stable, and the instantaneous phase of noise frequency unit being random, to weight each frequency unit by the instantaneous phase variance, and can further restrain the background noise energy disturbances and enhance the Signal to Noise Ratio (SNR) gain of the target line spectrum detection, and achieves detecting unknown line spectrum of underwater target radiated noise. The theoretical analysis and experimental results both show that this method can well enhance the target line spectral energy and restrain the background noise energy, and has the capacity of improving SNR. It has better application prospects to the detection and identification areas of anti-complex channel.
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