基于差分时延差编码的水声发射系统研制

差分时延差编码能有效抑制多途信道的干扰，实现信息的可靠传输，因此在水声通信中被广泛应用。本文设计了一种基于差分时延差编码的水声发射系统，针对差分时延差编码的特点和要求，利用波形存储直读方式产生码元，通过以太网将其传输到下位机并存储到存储器；然后对系统进行通信编码参数配置；最后基于下位机存储的码元和通信编码参数配置，将通信信息通过差分时延差编码并经数模转换器和低通滤波器变换后，由换能器发射出去。湖试通信实验表明，水声发射系统在不同参数条件下均能保证编码信息的准确性以及传输信息的可靠性，具有一定的实用性。

Underwater Acoustic Emission System Based on Differential Time Delay Shift Coding

Differential time delay shift coding can effectively suppress the interference of multipath channel, so it is widely used in underwater acoustic communication to realize the reliable transmission of information. In this paper, an underwater acoustic emission system based on differential delay difference coding is designed. According to the characteristics and requirements of differential time delay shift coding, the symbol is generated by waveform storage direct reading, which is transmitted and stored in the memory. Then the system is configured with communication coding parameters. Finally, the communication information is encoded through the differential time delay shift coding and transmitted by the digital-to-analog converter and low-pass filter and transducer. Lake communicaton experiment shows that the acoustic emission system can ensure the accuracy of the coded information and the reliability of the transmitted information under different parameters. So this system has certain practicality.