水声通信中多普勒频移补偿的仿真研究

Simulation Research on Doppler Compensation for Underwater Acoustic Communications

在水声通信中,收发双方存在相对运动时产生的多普勒频移将严重恶化载波恢复和符号同步。因此多普勒频移补偿是水声通信的关键技术之一,并日益受到人们的重视。本文提出了一种全新的、适用于收发双方存在较大相对速度时的多普勒频移检测和补偿技术。同时对与之相关的模糊度函数法、数据帧插入信号的选取、信号采样率转换、插值因子的确定与插值等问题进行了研究,通过仿真试验对多普勒频移方法进行了验证,并对其性能进行了分析。

In underwater acoustic communication, carrier tracking and symbol synchronization are adversely affected by Doppler, which is caused by the move between the transmitter and the receiver. So the Doppler compensation is one of the key techniques for acoustic communications and becomes more and more important. It is presented a new Doppler estimation and compensation scheme, which is suitable for underwater acoustic communications between rapidly moving platforms. Some questions relative to the Doppler shift compensation, such as the ambiguity function method, choice of signals inserted in the data packet, sampling-rate conversion, determining the number of subfilters (or interpolating factors) and interpolation are studied. This method is verified and its performance is analyzed by simulation.