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本文继续前文讨论声呐设计中的系统模拟技术。数字多波束声呐对目标的精确定向问题提出了新的要求。本文给出利用多波束输出实时计算信号入射角的几种方法,即内插法、微分相关法及互谱法。系统模拟的结果指出这些方法可以用于实时跟踪多个目标。 后置积累是声呐信号处理的重要组成部分。文中给出两种数字式积累器的系统响应,比较了它们的性能。指出指数型平均积累器是一种便于实现而性能又接近理想平均器的后置积累系统。我们还给出在计算机上进行模拟的结果。最后讨论声呐设计中系统模拟所面临的新问题。
This article continues the previous discussion of sonar design system simulation technology. The digital multi-beam sonar has put forward new requirements for the precise orientation of the target. In this paper, several methods for calculating the incident angle of signals in real time using multi-beam output are given, namely interpolation, differential correlation and cross spectrum. The results of the system simulation indicate that these methods can be used to track multiple targets in real time. Post accumulation is an important part of sonar signal processing. The paper gives two kinds of digital accumulator system response, compared their performance. It is pointed out that the exponential averager is a post-accumulation system that is easy to implement and close to the ideal averager. We also give the results of simulations on a computer. Finally, the sonar design system simulation to face the new problems.