在回顾并对比低通滤波法、插值法和多相滤波法三种中频正交采样方法的基础上,研究它们在宽带信号情况下的适用性,讨论宽带信号的中频正交采样方法及其工程实现,并进行计算机仿真。结果表明,低通滤波法更适合于宽带信号的中频正交化处理。

On the basis of reviewing and contrasting the three processing methods for quadrature sampling of IF(Intermediate Frequency) signal: the LPF(Low Pass Filter) method,the bessel interpolation method and the polyphase filter method.This paper deals with the applicability of the three methods with wideband signals and discusses the appropriate method fit for wideband signal and its implementation in project.These are also simulated on computer and the results show that the LPF method is more suitable for the quadrature sampling of wideband IF signal.

TN957.51