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首先简要介绍了相干激光测风雷达和数字滤波器组的工作原理,然后重点分析了余弦调制滤波器组。余弦调制滤波器组具有实现简单、占用资源少等特点。信号通过滤波器组后可分解成若干个窄带子信号,目标的多普勒频率将落入其中一个子带信号中,针对这一子信号进行处理可获得较高的信噪比。利用Matlab设计出了8通道余弦调制滤波器组,然后对回波信号进行处理,从仿真结果和实测信号处理结果可以看出:该方法可以判断并抽取出多普勒频率所在的子带信号。
Firstly, the working principle of coherent laser radar and digital filter bank is briefly introduced. Then the cosine modulated filter bank is analyzed emphatically. Cosine modulation filter bank has the characteristics of simple realization and less resource consumption. Signal through the filter bank can be decomposed into a number of narrow-band sub-signal, the target Doppler frequency will fall into one of the sub-band signals, for this sub-signal processing can be a higher signal to noise ratio. The 8-channel cosine-modulated filter bank is designed by Matlab, and then the echo signal is processed. It can be seen from the simulation results and measured signal processing results that this method can determine and extract the sub-band signal where the Doppler frequency is located.