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一、引言在另一篇同类的文献中介绍了一种对声纳信号进行数字对数归一化处理的方法。这种方法包括对整流后的多卜勒信号取对数和用一个时变数字高通滤波器滤去缓慢变化的趋势函数 p(n)。由于它企图在多波束脉冲声纳的大量的多卜勒通道上进行实时应用,因此,主要的重点就放在对计算过程的简化方面。得到了一个循环高通滤波器,当一出现输入信号样点就马上进行处理[顺序处理(serial processing)],并且只需要进行三次乘法就可以获得一个输出信号样点。文献中的图9、10和11直观地给出了滤波器的性能。
I. INTRODUCTION Another method of digital log normalization of sonar signals is described in another article of the same kind. This method involves taking a logarithm of the rectified Doppler signal and filtering the slowly varying trend function p (n) with a time-varying digital high-pass filter. As it seeks to implement real-time applications on a large number of Doppler channels in multi-beam pulsed sonar, the main focus is on the simplification of the computational process. A cyclical high-pass filter was obtained, which was processed as soon as the input signal sample appeared [serial processing], and an output signal sample was obtained with only three multiplications. Figures 9, 10 and 11 in the literature give an intuitive view of the performance of the filter.