中文摘要：

直接序列扩频技术是一种能有效抗多径和抗干扰的信息传输技术，针对浅海信道强多径干扰和低信噪比的特性，研究了一种二进制差分相位键控一直接序列扩频（DS-DBPSK）水声调制解调技术方案，并设计了以高速DSP芯片TMS320C6713为核心的调制解调实现系统．为了合理利用DSP的CPU资源及保证调制解调方案的实时实现。系统采用DSP／B10S实时操作系统提供的中断管理和多线程机制，在提高程序执行效率的同时降低了对存储器和CPU的负荷和需求．初步的湖试和海试结果表明了该系统的有效性．

英文摘要：

DSSS is a kind of anti-multi-path and anti-jamming technology used for data transmission. In view of the strong multipath and low-SNR characteristics in shallow water channel, this paper studied a DSSS underwater acoustic communication scheme and designed a modulation and demodulation implementation system based on high-speed DSP TMS320C6713. This system adopted the interrupt management and muhithread mechanism provided by DSP/BIOS to make rational use of DSP CPU resources and ensure the real-time operation. The experimental results obtained at lake and on sea confirmed the effectiveness of the proposed system.