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本文首先给出了一种声纳信号模拟器的信号与噪声产生的算法。目标回波信号的产生采用复包络-调制法。噪声的产生利用白噪声激励AR滤波器来实现,分别讨论了复数AR滤波法和实数AR滤波法两种可能的实现途径,并分析了各自优缺点。在此基础上,给出了信号与噪声产生的硬件框图,并分析了其中的关键技术问题(均匀分布白噪声的获取、多路互不相关的噪声获取等)。最后给出了该声纳信号模拟器总体硬件框图和软件框图,并对该模拟器的运行结果进行了分析和检验。
In this paper, an algorithm of signal and noise generation for sonar signal simulator is given first. The target echo signal is generated by complex envelope-modulation method. The generation of noise is realized by using white noise excitation AR filter. Two possible ways to realize complex AR filtering and real AR filtering are respectively discussed, and their respective advantages and disadvantages are analyzed. On this basis, the hardware block diagram of signal and noise generation is given, and the key technical issues (uniform white noise acquisition, multiple non-correlated noise acquisition, etc.) are analyzed. Finally, the overall hardware block diagram and software block diagram of the sonar signal simulator are given, and the operation results of the simulator are analyzed and verified.