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一、引言 海洋中水声信号波形的变化规律是一个重要的研究课题,利用信号波形特征可能识别不同的水下目标、提高信号处理的增益。信号波形的规律性也可用来监测某些海洋环境参数的变化。深海中存在较稳定的水下声道,文研究过水下声道中信号波形规律。由于浅海环境的复杂性,海水介质及其边界在空间与时间上存在着有规则的与随机的变化。因而浅海中脉冲信号的波形结构需要进行专门的研究。本文仅就负跃层浅海中的信号波形规律进行一些探讨。
I. INTRODUCTION The change rule of underwater acoustic signal waveform is an important research topic. It is possible to identify different underwater targets by using signal waveform features and improve the signal processing gain. The regularity of the signal waveforms can also be used to monitor changes in certain marine environmental parameters. There is a relatively stable underwater channel in the deep ocean, and the law of the signal waveform in the underwater channel has been studied. Due to the complexity of the shallow sea environment, there are regular and random changes in the space and time of the seawater medium and its boundaries. Therefore, the waveform structure of the pulse signal in shallow sea needs special research. In this paper, only some of the laws of signal waveform in the shallow sea of the negative level are discussed.