一种适用于高速移动水声通信的多普勒频移因子估计方法  

A Doppler Shift Factor Estimation Method for High Speed Mobile Underwater Acoustic Communication

作　　者：杨杰[1] 周胜源[1] 于峰崎[2] 

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]中国科学院深圳先进技术研究院集成电子研究中心,广东深圳518055

出　　处：《计算机工程》2016年第9期100-104,共5页Computer Engineering

基　　金：国家自然科学基金资助项目(61562074);广东省产学研基金资助项目(2012B090600035)

摘　　要：在水声通信系统中,大多数多普勒频移因子估计方法未能很好地处理相对运动速度较高时计算复杂度与估计精度之间的关系。针对该情况,提出基于快速傅里叶变换(FFT)测频和模糊度函数的联合估计方法。通过FFT对单频脉冲信号进行测频以确定多普勒频移因子的初步估计范围,再使用模糊度函数法在该范围内进行搜索,得到精确的多普勒频移因子。仿真结果表明,当信噪比大于-20 d B时,该方法在相对运动速度为-60 m/s^60 m/s时能保持高于0.02%的估计精度,且与单独使用模糊度函数的估计方法相比,具有较低的计算复杂度。In underwater acoustic communication systems,most of the Doppler shift factor estimation methods cannot deal with the relationship between computational complexity and estimation accuracy under high relative motion speed. In view of this, this paper proposes a Doppler shift factor estimation method based on the Fast Fourier Transformation （FFT） frequency measurement and ambiguity function. First,the range of Doppler shift factor is determined in a small range by using FFT on the single-frequency pulse signal. Then, Doppler shift factor is estimated by using ambiguity function method in the range of determination. Simulation results show that estimation accuracy maintains higher than 0. 02% when SNR is greater than -20 dB and relative motion speed is - 60 m/s to 60 m/s. Computational complexity is significantly reduced compared with the ambiguity function method.

关 键 词：水声通信 多普勒频移因子 模糊度函数 快速傅里叶变换测频 单频脉冲信号 

分 类 号：TN911.7[电子电信—通信与信息系统]