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本文论述一种独特的信号处理方式——数字时间相关积累及其在浅海声信道中的应用。共分三部份:(Ⅰ)自相关积累;(Ⅱ)互相关积累;(Ⅲ)抗多途径性能分析。本文(Ⅰ)论述数字自相关积累。首先实验研究了浅水信道中信号和噪声的统计特性,进而讨论了自相关积累的工作原理和基本结构,侧重地估算几种典型声呐系统的虚警概率、检测概率和输入信噪比及其关系。理论估算和实验证明,自相关积累信号处理方式适用于随机时-空变、强多途和高噪声级的复杂浅水信道,对于低速率的情况具有普遍意义。
This article discusses a unique way of signal processing - digital time-dependent accumulation and its application in shallow-sea acoustic channels. Divided into three parts: (Ⅰ) accumulation of autocorrelation; (Ⅱ) cross-correlation accumulation; (Ⅲ) anti-multi-path performance analysis. This paper (Ⅰ) discusses the accumulation of digital autocorrelation. Firstly, the statistical properties of signal and noise in shallow water channel are experimentally studied. Then the working principle and basic structure of autocorrelation accumulation are discussed. The false alarm probability, detection probability, input signal-to-noise ratio and their relationship of several typical sonar systems are emphatically estimated . The theoretical estimation and experiments show that the self-correlated accumulation signal processing method is suitable for the complex shallow water channel with random time-space change, strong multi-path and high noise level, which is of universal significance for low-rate cases.