基于多相滤波结构的宽带接收机数字下变频研究

主要介绍了采用软件无线电技术对宽带侦察接收机中频数字信号进行下变频处理的一种方法——基于多相滤波结构的数字下变频处理。在简要说明多相滤波器及下变频器工作原理的基础上，重点介绍了基于多相滤波结构的宽带侦察信号数字下变频处理方法，并给出了采用MATLAB进行仿真的结果。同时，针征对信号处理中对高速测频的要求，介绍了一种基于离散傅立叶变换（DFT）的三次样条插值快速测频方法并进行了仿真。

The Research about Digital down Conventer Based on Polyphase Filters for Wide-Band Receiver

This paper mainly introduces a method of digital down conventer(DDC) based on polyphase filters for processing intermediate frequency(IF) digital signals of wide-band reconnaissance receiver.It first explains the principle of polyphase filters,then expatiates the principle realization of DDC based on polyphase filters,at last gives the result of simulation.At the same time,this paper introduces a fast measuring frequency method using spline cubic interpolation based on discrete Fourier transform(DFT)and gives the result of simulation.