一種基于瞬時(shí)相位方差加權(quán)的線譜檢測器
doi: 10.11999/JEIT141347
基金項(xiàng)目:
國家自然科學(xué)基金(61372180)和中國科學(xué)院聲學(xué)研究所青年人才領(lǐng)域前沿項(xiàng)目
Weighted Line Spectrum Detector Based on Instantaneous Phase Variance
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摘要: 針對(duì)水下目標(biāo)未知線譜的檢測問題，依據(jù)水下目標(biāo)輻射噪聲含有高強(qiáng)度穩(wěn)定線譜這一特征，該文提出一種基于瞬時(shí)相位方差加權(quán)的線譜檢測方法。該方法利用目標(biāo)線譜頻率單元對(duì)應(yīng)瞬時(shí)相位比較穩(wěn)定，背景噪聲頻率單元對(duì)應(yīng)瞬時(shí)相位比較隨機(jī)的特點(diǎn)，對(duì)各頻率單元進(jìn)行瞬時(shí)相位方差加權(quán)，可以進(jìn)一步抑制背景噪聲能量干擾，增強(qiáng)目標(biāo)線譜檢測信噪比(SNR)增益，實(shí)現(xiàn)對(duì)水下目標(biāo)輻射噪聲中未知線譜的檢測。理論分析和實(shí)驗(yàn)結(jié)果表明：該方法可以較好地增強(qiáng)目標(biāo)線譜能量、抑制噪聲、提高信噪比，在抗復(fù)雜信道檢測、識(shí)別領(lǐng)域具有良好的應(yīng)用前景。
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關(guān)鍵詞:
- 信息處理 /
- 水下目標(biāo)輻射噪聲 /
- 線譜檢測 /
- 瞬時(shí)相位方差
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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