基于单位取样响应移位的采样时间差消除方法

A Novel Method to Eliminate the Difference of Sampling Instant Based on the Shifted Unit Impulse Response

本文提出了一种工程上实用的采样时间差消除方法——单位取样响应移位法。该方法将采样时间差的消除过程与后续的数字信号处理结合起来,相当于零计算量完成了采样时间差的消除过程。结合LFM信号的匹配滤波过程,验证了该方法的性能。给出了基于该方法的正交解调结构设计,新的结构优化了基于LFM信号的数字正交解调处理流程,节省了硬件资源与处理时间,易于工程实现。在性能允许的前提下,适合于大时宽带宽LFM信号的直接中频采样数字正交解调。

The novel practical method to eliminate the difference of sampling instant which is called the shifted unit impulse response is proposed in this paper.By integrating the process of elimination with the subsequent digital signals processing,the method is equivalent to eliminate the difference of sampling instant with nil-operation.When combined with the matching filter operation of LFM signals,the performance analysis of the novel method is validated.A novel topology which is easy to be implemented can optimize the digital signals process flow,economize the hardware resources and the runtime is presented based on the novel method.The novel topology is suitable for the quadrature demodulation for large TB LFM signal by direct sampling of IF signal on the premise of performance.