一、导言在一个主动式声纳系统的接收机中,进行归一化的目的是为了减小输出的动态范围,以便能送给操作人员在显示器上观看或在听闻通道中收听。这样,对一个主动式声纳系统,要求在近距离强混响情况下信号不会超载,而在远距离噪声限制情况下仍能保持完全的动态范围。需要控制的动态范围的典型值在几秒时间内可达80分贝。同样,在被动式接收机中虽然 I. INTRODUCTION In the receiver of an active sonar system, the purpose of normalization is to reduce the dynamic range of the output so that it can be given to the operator for viewing on the display or listening to the channel. In this way, for an active sonar system, the signal is not overloaded with strong strong reverberations at close range, while maintaining full dynamic range with long range noise limits. The typical dynamic range to control is up to 80 dB in seconds. Again, though in passive receivers