中文摘要：

水下声通信是海洋中最主要的通信方式,在时变空变随机多途的恶劣信道中实现可靠的超远程水声通信,是一项亟待解决的难题;论文提出了一种利用水下等离子体脉冲信号、采用脉冲定宽时序编码调制方案的超远程水声通信体制,研制了一种基于水下等离子体的微型脉冲声源,搭建了基于该声源的脉冲通信发射机,实现了入水自动检测、休眠定时切换、发射频率可调、码元调制编码等脉冲通信功能;经水池试验验证,该发射机在Φ60×600 mm体积内声源级达217 dB,较好地实现预设脉冲信号的发射.

英文摘要：

Under water acoustic communication is a main form of the communications in oceans,but urgent solutions are needed to overcome one intractable problem of that：how to establish remote underwater acoustic communication and ensure its reliability and stability in such unfavorable underwater acoustic channels that are random temporal,spatially variable and of multipath.This paper proposes to build up a remote underwater communication system with the utilization of underwater plasma pulse signal and fixed width temporal order coding modulation.A micro underwater acoustic pulse source based on underwater plasma is designed and tested,based on which a transmitter for pulse communication is established.Several functions for pulse communication of the device is achieved：automatic start in water,clocked dormancy system,adjustable emission frequency and the encoding and decoding of code elements.With the results of underwater experiments,the transmitter behaves well in the emission of pulse signals that are set previously,and the source level can reach 217 dB with the volume of Φ60× 600 mm.