CAJ | 학술논문

针对水下目标未知线谱的检测问题，依据水下目标辐射噪声含有高强度稳定线谱这一特征，该文提出一种基于瞬时相位方差加权的线谱检测方法。该方法利用目标线谱频率单元对应瞬时相位比较稳定，背景噪声频率单元对应瞬时相位比较随机的特点，对各频率单元进行瞬时相位方差加权，可以进一步抑制背景噪声能量干扰，增强目标线谱检测信噪比(SNR)增益，实现对水下目标辐射噪声中未知线谱的检测。理论分析和实验结果表明：该方法可以较好地增强目标线谱能量、抑制噪声、提高信噪比，在抗复杂信道检测、识别领域具有良好的应用前景。
침대수하목표미지선보적검측문제，의거수하목표복사조성함유고강도은정선보저일특정，해문제출일충기우순시상위방차가권적선보검측방법。해방법이용목표선보빈솔단원대응순시상위비교은정，배경조성빈솔단원대응순시상위비교수궤적특점，대각빈솔단원진행순시상위방차가권，가이진일보억제배경조성능량간우，증강목표선보검측신조비(SNR)증익，실현대수하목표복사조성중미지선보적검측。이론분석화실험결과표명：해방법가이교호지증강목표선보능량、억제조성、제고신조비，재항복잡신도검측、식별영역구유량호적응용전경。
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 phase’s 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.