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当水声设备发射的是周期性脉冲序列,且周期T足够长时,根据相关函数理论和统计检测理论导出的结果,宜用发射的脉冲个数值作为判决相关器输出含有、无信号的门限值。现设计了延迟时间等于T的自相关器,将其输出的自相关函数R_X(T)值与选定的最佳门限值比较,能在强宽带噪声干扰下提取微弱信号。其线路简单、可靠、省电、使用方便,且只要改变电路中的某些参数,就可用于不同海区、不同周期的发射脉冲序列。该线路已安装在浅海声释放器等水声遥控设备的水声指令接收机中使用。
When the underwater acoustic equipment emits a periodic pulse sequence and the period T is long enough, it is appropriate to use the value of the transmitted pulse as the output of the decision correlator according to the correlation function theory and the result of the statistical detection theory. The signal-free threshold value. The autocorrelator with delay time equal to T is designed. The autocorrelation function of output autocorrelation function R_X (T) is compared with the selected optimal threshold value to extract the weak signal under strong broadband noise. The circuit is simple, reliable, energy saving, easy to use, and as long as the change of certain parameters in the circuit can be used for different sea areas, different periods of firing pulse sequence. The line has been installed in the shallow water sound release device and other underwater acoustic remote control equipment used in underwater acoustic command receiver.