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该文分析了PDA信号的特点,介绍了PDA信号的互谱密度分析方法及其实现技术,利用具有高分辨率的频谱处理措施实现了PDA处理中的多粒子分辨.“,”This paper analyses the characteristics of PDA signals, introduces cross-spectral density analysis methods in PDA signals and its realizing technique, and utilizes the frequency spetrum processing of high resolving power to achieve multi-particle discrimination in PDA signals.