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由于水声信道的随机时变及多途特性,使得以发射信号作参考的匹配滤波器检测性能的下降。本文提出当多途结构具有相对稳定部分时,可采用以下两种信道匹配方法:(1)脉间相关信道匹配法(参见[4]);(2)解卷求信道响应法,后一方法要求发射宽带短脉冲,用解卷求出的信道响应h(τ,ι)去修正欲发射的其它声呐信号,并把它当作匹配滤波器的响应函数,以提高匹配滤波器对时变信道的适配能力。本文前一部分对各种设定的信道模型,给出了修正匹配的计算机模拟结果;后一部分给出了经4浬和24浬海洋信道传输的数据的修正匹配,并给出了以上两部分修正前后的计算机结果比较。对大信噪比,修正匹配的效果是十分显著的。
Due to the random time-varying and multi-path characteristics of underwater acoustic channels, the performance of matched filters with transmitted signals as a reference is deteriorated. This paper proposes the following two channel matching methods when the multi-path structure has a relatively stable part: (1) inter-pulse correlation channel matching method (see [4]); (2) unwinding the channel response method and the latter method It is required to launch a broadband short pulse and use the channel response h (τ, ι) obtained from unwinding to correct other sonar signals to be transmitted and use it as the response function of the matched filter so as to improve the matching performance of the matched filter to the time varying channel Adaptability. In the first part of the thesis, the computer simulation results of the modified matching are given for the various channel models. The latter part shows the matching of the data transmitted over the 4 浬 and 24 浬 oceanic channels, and the above two parts are given Comparison of computer results before and after. For large signal to noise ratio, the effect of correction match is very significant.