数字电视辐射源雷达的相参积累徙动补偿方法

Method of Migration Compensation in Coherent Integration for Digital TV Based Passive Radar

增加相参积累时间是提高数字电视辐射源雷达探测能力的主要途径,但目标的速度和加速度导致的距离徙动和多普勒徙动限制了相参积累时间的进一步增加。该文给出了外辐射源雷达中匀加速运动目标的回波模型,分析了目标速度和加速度对相参积累的影响,提出了基于包络插值和分数阶傅里叶变换的数字电视辐射源雷达徙动补偿算法。仿真结果表明,该算法可有效补偿长时间积累和目标运动导致的距离徙动和多普勒徙动,提高了相参积累增益,从而使相参积累时间不再受目标速度和加速度的限制。

Increasing integration time is the main approach to improve performance of digital TV based passive radar,but the range and Doppler migration caused by velocity and acceleration of the targets restrict the coherent integration time.This paper presents the echo signal model of the moving targets in uniform acceleration for passive radar,and analyzes the influence of velocity and acceleration,and then proposes a new migration compensation algorithm based on envelope interpolation and fractional Fourier transform for digital TV based passive radar.Simulation results show that the proposed algorithm can efficiently compensate the range and Doppler migration caused by long integration time and moving targets,and the coherent integration gain is improved,so the constraint of integration time limited by velocity and acceleration is removed.