摘要： 卫星通信的地面接收阵列天线在信号处理的过程中，若数字下变频时没有进行载波同步，则此时多普勒频移仍存在于系统中。根据阵列信号处理模型，对采用Frost LMS自适应滤波算法的卫星通信接收天线波束合成系统进行研究，给出一种自适应滤波算法对空域自适应滤波的分析方法。对接收阵列天线的方向图及信号频谱进行仿真，结果表明，多普勒频移不影响空域自适应滤波性能。
关键词:
卫星通信,
自适应滤波,
载波同步,
多普勒频移,
数字下变频
Abstract: Array antenna is one kind of receiving antenna for earth state in the satellite communication system. However, the Doppler frequency shift exist if the carrier synchronization is not used in the digital down conversion. The spatial adaptive filter is analysed based on the array signal model in the case that Frost Least Mean Square(LMS) algorithm is employed. Simulation result of direction diagram of receiving array antenna and signal spectrum shows that Doppler frequency shift can not impact the performance of spatial filter, and the correctness of the method.
Key words:
satellite communication,
adaptive filtering,
carrier synchronization,
Doppler frequency shift,
digital down converter
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