摘要
为了尽可能多地用软件来实现通信和雷达接收机的处理功能,需要直接对中频信号进行采样,然后通过数字正交变换的方法得到同相和正交分量.该文首先对多相滤波法实现数字正交变换的原理进行了分析,然后根据多抽样率信号处理理论详细证明了内插时延滤波器能够用多相滤波器组中的子滤波器实现.最后,计算机仿真结果表明,所设计的内插时延滤波器的相频特性和幅频特性均满足要求.
In order to implement processing functions of receiver in communication and radar systems by software as far as possible, it is necessary to use the direct IF sampling and digital quadrature transformation to obtain baseband inphase and quadrature components. This paper investigates the principle of the digital quadrature transformation based on polyphase filtering, and proves that the interpolation delay filters can be replaced with branch filters from a polyphase filter bank according to the theory of multirate signal processing. Simulation results demonstrate that the magnitude and phase response of the designed interpolation delay filters can meet the demands.
出处
《上海大学学报（自然科学版）》
CAS
CSCD
2003年第1期9-12,54,共5页
Journal of Shanghai University:Natural Science Edition
基金
江苏省自然科学基金 (BK2 0 0 1 0 3 6 )资助项目
