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本文将海洋声传输信道考虑为线性随机时变信道,提出时变信道的二维Wigner-Ville谱并直接用来分析信道由于多途和起伏效应引起的时频衰落和扩展的联合统计特性或信道的时间-频移-频率-延迟的联合分布特性。文章还讨论了信道输出Wigner-Ville谱与输入Wigner-Ville谱和信道二维Wigner-Ville谱的关系,并以几种特殊信道为例作了说明。最后还就信道二维WV谱在检测中的应用进行了讨论,指出用线性调频信号作为检测信号的特点。
In this paper, the ocean acoustic transmission channel is considered as a linear random time-varying channel, a two-dimensional Wigner-Ville spectrum of time-varying channel is proposed and directly used to analyze joint statistical characteristics or channel of time-frequency fading and expansion due to multipath and undulation effects The time-frequency shift-frequency-delay combination distribution. The article also discusses the relationship between the channel output Wigner-Ville spectrum and the input Wigner-Ville spectrum and the channel two-dimensional Wigner-Ville spectrum, and illustrates several special channels. Finally, the application of channel two-dimensional WV spectrum in the detection is also discussed. It is pointed out that the chirp signal is used as the detection signal.