“循环卷积”教学案例设计——雷达目标微动周期估计

Teaching Case Design of"Circular Convolution"——Micro-Motion Period Estimation of the Radar Target

循环卷积是“数字信号处理”中的重要知识点,其一般用于实现线性卷积,实际应用例子较为少见,使学生对循环卷积的理解认识不够深刻,认为循环卷积用途单一。本文以雷达目标微动周期估计为例,介绍如何用循环卷积实现时频图相关性的提取,以及循环卷积在微动周期估计中的应用价值。结合基于时频图相关性的雷达目标微动周期估计这一前沿科研成果讲解循环卷积知识点,能够更加生动展示循环卷积的具体应用,加深学生对知识点的认识理解,激发学生投身于科学研究之中。

Circular convolution is an important knowledge point of the"digital signal processing",which is used for implementing the linear convolution.Its application is rare in practice.As a result,students cannot get deep insight and think that its functionality is unitary.In this paper,micro-motion period estimation for radar targets is used for example.In particular,details of how to use circular correlation to extract the time-frequency correlation and the application value of circular correlation is micro-motion period estimation are presented.The explanation of circular convolution with this scientific achievement-micro-motion period estimation based on timefrequency correlation,can present the application of circular convolution lively,strengthen the students'understanding of knowledge point,and stimulate students to devote into scientific research.