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通过大量仿真和实测目标回波数据检验,本文提出了微弱单频回波信号检测的过零点分析方法。该方法对输入信噪比的要求与单纯幅值判决相比,降低了14dB.它的特点是运算量少,耗时短,信号检测增益高,所需存贮单元少,特别适合于水下便携式检测设备及水中兵器的微弱信号的检测,该方法也可用于语音、地震、生物、医疗等领域单频弱信号的检测。
Through a large number of simulation and measured target echo data test, this paper presents a weak single-frequency echo signal detection zero-crossing analysis method. The proposed method reduces the input signal-to-noise ratio by 14dB compared with the simple amplitude decision. It is characterized by less computing time, short time-consuming, high signal detection gain, the required storage unit less, especially suitable for underwater portable detection equipment and underwater weapons weak signal detection, the method can also be used for voice, earthquakes, Biological, medical and other areas of single-frequency weak signal detection.