Rayleigh商-降采样滤波器在基于调频广播信号的单站无源定位系统中的应用
Application of Rayleigh Quotient-Desampling FIR Filter in Passive Location System Using the FM Broadcast Signals
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摘要: 根据基于调频广播信号的无源定位系统中相干脉冲压缩处理的特点，指出在相关脉冲压缩中进行降采样处理的可行性，并提出了以信噪比增益最大为评价准则设计降采样滤波器。推导了信噪比增益与降采样滤波器权系数的关系，给出了采用Rayleigh商方法求解给出准则下最优FIR滤波器的方法和步骤。仿真实验验证了在相干脉冲压缩中采用Rayleigh商-降采样滤波器既降低了计算量又保证了脉冲压缩后的信噪比增益。Abstract: According to the characteristic of coherent pulse compression in the passive location system using the FM broadcast signals, the desampling FIR filter is necessary and feasible. The maximum of SNR after coherent pulse compression is defined as the proper criterion for the design of the desampling filter. The relation of the SNR and the coefficients of the filter adopted is deduced. The steps by the Rayleigh quotient method to obtain the optimal desampling FIR filter are also presented. The results of simulation show that the proposed method achieves good SNR despite its low computation complexity.
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