一种稳健的水声差分跳频通信体制  

A Robust Underwater Acoustic Differential Frequency-hopping Communication System

作　　者：刘友永[1] 梁国龙[1] 张光普[1] 殷敬伟[1] 

机构地区：[1]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001

出　　处：《压电与声光》2009年第3期337-340,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(60802060);国防重点实验室基金资助项目(51445030205ZS2301)

摘　　要：基于水下目标的通信保密、安全可靠性要求,提出一种新的水声差分跳频通信体制,与传统跳频通信不同,它是利用相邻跳频调制信息。通过分析其频率转移函数的构造方法和差分跳频信号的多途特征,提出一种基于自相关的短时傅里叶变换的跳频检测方法,并利用Viterbi算法纠正部分错码。仿真结果表明,该文提出的通信体制和检测方法能有效的克服水下干扰、多途和多普勒频偏,在较低信噪比下,仍有较好的误码性能,适用于水下安全保密通信场合。A new underwater acoustic differential frequency-hopping communication system was proposed based on the safety and reliability of communication of the underwater target. Comparing with the conventional frequencyhopping communication, this frequency-hopping communication system transmits data between two adjacent frequency-hopping modulations. By analyzing algorithms of G function and multi-path of received differential frequency-hopping signal, a method of hop-detecting based on the autocorrelation and STFT transform was proposed. The viterbi algorithm was used to correct the wrong part of the code. The simulation results showed that the proposed com- munications system and the detection method have the advantage of conquering the interference and multi-path, and have a good BER performance for underwater acoustic communications regarding the safety and reliability under low SNR.

关 键 词：水声差分跳频通信 频率转移函数 短时傅里叶变换 VITERBI算法 

分 类 号：TB567[交通运输工程—水声工程]