基于双采样速率的动目标检测技术研究

A Study on Moving Target Detection Technique Based onDouble Sample Rate

高精度动目标检测是雷达数字接收机的一项核心技术,现有的多普勒频移估计方法不能满足现代数字接收机的高精度、低计算量、超低信噪比环境等要求。该文提出了一种低信噪比环境下的基于双采样速率的高精度动目标检测技术,它包括基于FFT的欠采样信号频率无模糊估计,高精度多普勒频移估计和基于双采样速率的动目标径向速度估计等算法。

High accuracy moving target detection is a key technique in the digital radar receiver. The Doppler frequency estimation methods which have been presented can not satisfy the performances of modern digital receivers such as high estimation accuracy, less computation, super low SNR circumstance, etc. In this paper, a high accuracy detection technique of moving target based on double sample rate in low SNR circumstance is proposed, and it includes three main techniques, i.e. unambiguous frequency estimation of sub-sampling signal based on FFT, high accuracy Doppler frequency estimation and radial rate estimation of moving target based on double sample rate.