基于矢量传感器的水下双址接入研究

针对水声信道的特殊性,提出一种适用于水声通信的双址接入方法。旋转矢量传感器的组合指向性,使其零点对准某一信源,则该信源被屏蔽,此时信宿可以与另一信源进行通信,反之亦然。矢量传感器的空间指向性不随频率变化,该方法可以实现宽带双址异步通信。此外,当两信源之间的开角大于34.8°时,通过对矢量传感器声压和振速输出的联合处理,可以使分离出的不同信源所发射的信号获得一定的信噪比增益。理论分析、数值仿真和湖上实验结果表明:基于矢量传感器的双址通信算法实现简单,信道资源利用率高,可以与其它多址接入技术结合使用,并且矢量传感器的空间增益可以有效降低系统的误码率。由于水声信道的特殊性,水下信息网须采用多种多址接入技术,本文所提出的双址通信方案将是其它多址接入技术的有益补充。 

Research on underwater double-address access based on vector sensor

Versus the characteristics of underwater acoustic (UWA) channel,the paper proposed a novel double-address accessing means in UWA communication.Information sources can be cancelled by using rotating the combining directory of vector sensor and meanwhile the desired source can communicate with others normally,vice versa.Due to the spatial directory of vector sensor does not vary with frequency hopping,this method can be utilized to realize wideband double-address asynchronous communication.Furthermore,when the angle between two information sources is bigger than 34.8°,by processing signals from pressure channel and velocity channel,an improvement can be obtained in the gain of signal to noise ratio.Theoretical analysis,simulation and lake trial results indicate that the theory of double-address communication basing on vector sensor can be completed easily and the ratio of bandwidth utilization is higher. Moreover,this method can also be combined with other multiple accessing techniques and the spatial gain acquired by vector sensor will decrease bit error rate (BER) effectively.Due to the particularity of underwater acoustic channel, underwater information networks use multi-address accessing techniques,to which double-address access technique this paper proposed is a useful complement.