一种线性调频扩频水声通信的新同步方法  

A novel synchronization method for LFM based spread spectrum underwater acoustic communication

作　　者：何成兵[1] 黄建国[1] 张群飞[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《应用声学》2008年第5期386-390,共5页Journal of Applied Acoustics

基　　金：国家自然科学基金(60572098);西北工业大学博士论文创新基金(CX200602);教育部博士点基金(20070699020)

摘　　要：针对高速运动过程中的水声通信,提出一种新型稳健的同步方法。该方法充分利用线性调频(LFM)信号的自相关特性及LFM扩频水声通信解调原理。湖试结果表明该方法简单有效,能够消除同步误差累积。利用湖试数据进行的仿真结果表明:该方法在常速及变速运动情况下均有效;在水下24m/s高速运动、时变多途干扰、带内接收信噪比低于0dB时,数据率可达为100bit/s,误码率保持在10^(-4)左右。A novel synchronization method is proposed to improve the LFM based spread spectrum underwater acoustic communication in large Doppler environment. It uses the autocorrelation characteristic of the linear frequency modulation signal （LFM）. Lake experiment results showed that it＇s being able to eliminate the synchronization error. Our simulated results by using the lake saved communication data show that this novel method is also effective in large Doppler and variant Doppler conditions. The LFM based spread spectrum underwater acoustic communication can reach 100bits/s when the received SNR is below 0dB, the time-varying multipath propagation exists and the relative speed between transmitter and receiver is as large as 24 m/s.

关 键 词：水声通信 线性调频信号 新同步方法 多普勒 

分 类 号：TN929.3[电子电信—通信与信息系统] TM773[电子电信—信息与通信工程]