【作者】 肖慧； 胡卫东； 郁文贤；

【Author】 XIAO Hui HU Wei-dong YU Wen-xian (ATR State Key Lab,National Univ.of defense Technology,Changsha 410073,China)

【机构】 国防科技大学电子科学与工程学院ATR重点实验室；

【摘要】 针对LFMCW雷达中高速加速运动目标参数估计问题,提出一种二次混频-DPT处理方法。利用对称三角线性调频信号的调频对称性,采用同一周期上、下调频段差拍信号二次混频的处理消除跨距离单元走动现象。然后对二次混频信号一维距离像按距离单元进行DPI处理,实现加速运动目标的检测和加速度、初始速度的估计。根据估计值构造运动补偿信号对一次差拍信号进行运动补偿,实现目标初始距离的估计。给出了方法的性能分析。仿真结果与直接DPI方法进行了比较,无论从谱峰的尖锐程度还是从伪峰的抑制上,本文方法都显示出更好的性能。更多还原

【Abstract】 To solve the parameter estimation problem of high-speed accelerating target in LFMCW(linear frequency-modulated continuous wave) radar,a secondary mixing combined DPT(discrete polynomial-phase transform) method is proposed.Based on the modulation symmetry of triangular LFMCW signals,secondary mixing of up-sweep beat and down-sweep signals from the same period is adopted to remove MTRC(migration through range cell) induced by the high-speed.Then DPT processing is performed for each range cell of the range profiles,and the parameter estimation of the acceleration and the initial velocity can be obtained.The following motion compensation for the beat signals will yield the initial range of the target.Performance analysis is given in detail.Simulation results are compared with the direct DPT processing,and the proposed method reveals superior performance both in the sharpness of the true peak and in the suppression of the pseudo peaks.更多还原