基于差分Pattern时延差编码和海豚whistles信号的仿生水声通信技术研究

Research on bionic underwater acoustic communication technology based on differential Pattern time delay shift coding and dolphin whistles

为解决传统的隐蔽水声通信方法带来的通信性能降低问题,提出了一种将差分Pattern时延差编码通信体制与海豚whistles信号相结合的仿生水声通信技术.海豚whistles信号频带较窄且各信息码元间隔不等、码元之间互相关性较弱,选取whistles信号作同步码和Pattern码,并以相邻whistles信号之间的时延差值携带信息.这种仿生的水声通信信号不易被敌方探测、截获,且差分Pattern时延差特殊的编码方式也不易使信息被破译,因此该水声通信技术具有较强的隐蔽性和保密性,且在抗码间干扰以及抗多普勒效应方面具有优异性能.本文对系统进行了水池实验,在信噪比为0 dB、存在相对运动时实现了通信速率为67 bit/s的低误码数据传输,验证了系统的有效性、稳健性和隐蔽性.

Regarding the performance degradation caused by the traditional method of covert underwater acoustic communication, in this paper we propose a bionic underwater acoustic communication technology on the basis of differential Pattern time delay shift coding system and dolphin whistles. The signal band of dolphin whistles is narrow and the intervals between information signals are different, and the cross-correlation is very weak. Dolphin whistles are used for synchronization and Patterns, for the time interval between dolphin whistles conveys the information bits. The mimicked version of communication signal is not easy to detect and intercept, and the special encoding method of differential Pattern time delay shift also makes the information not easy to decipher, so this bionic underwater acoustic communication technology has strong covert and confidential nature and it also has an excellent performance in anti inter-symbol interference and anti Doppler effect. A tank experiment is conducted for this system. At SNR 0 dB and relative movement, the user message is recovered at an effective data rate of 67 bit/s with low bit error. It is proved that the system has an effectiveness, robustness and covert nature.