水声扩频通信的关键技术及试验研究

针对水下声信道的独特环境,利用扩频通信技术的抗多途、抗干扰、低信噪比检测等优良性能,设计并实现了一个水声扩频通信系统。对于水声通信中严重的多途衰落和多普勒频移现象,采用多径分离再合并技术和实时频率跟踪技术有效地解决了以上问题,大大降低了系统的误码率。并采用沃尔什快速相关算法,实时地处理接收信号。通过湖试和海试,验证了此通信系统的优良性能。可以达到低功耗、远距离、高隐蔽性、低信噪比检测、高可靠性的数据传输性能。

Research on Key Techniques and Trial of Underwater Acoustic Spread-spectrum Communication

Underwater acoustic(UWA) channel is special from other channels.An UWA spread-spectrum communication system was designed and realized by using the good performances of anti-multipath,anti-jamming and low SNR diction of spread-spectrum communication technology.However,serious multipath fading and Doppler frequency shift lead to high bit-error-rate of UWA communication.Two key techniques were studied,which solved the problems said above effectively.A fast arithmetic of correlation operation was also adopted to process receiving signal in real time.The perfect performances of this communication system were validated by lake trial and sea trial.It realized data transmission with low power,long distance,low signal noise ratio(SNR) detection and low bit-error-rate.