摘要
为了精确估计频率步进雷达目标参数并进行运动补偿,提出了基于调频傅里叶变换的目标径向运动速度补偿方法。与本振信号混频后目标散射点回波可看作线性调频信号,其相位一次项和二次项只与目标速度和初始距离有关,通过搜索调频傅里叶变换的调频率和频率参数,获得了目标运动速度和初始距离的精确估计,然后实现运动补偿。仿真结果进一步验证了文章所采用方法的有效性和实用性。另外,通过与最小脉组误差估计法比较说明了文章所提方法具有更好的抗干扰能力;最后还对多目标运动速度估计问题进行了初步探讨。
To provide an accurate estimation for the parameters of the stepped-frequency radar target,and then to finish motion compensation,a method for velocity compensation is proposed according to the chirp-Fourier transform. The target echo after mixing the vibration signal can be regarded as a linear FM signal,one and square terms of the phase are only related with the target's speed and initial distance. The target's speed and initial distance can be estimated precisely by searching frequency and chirp rate of the chirp-Fourier transform,and to realize motion compensation finally. Simulation results prove the validity and practicability of the method. In addition,the method shows the better anti-jamming performance compared with the minimum burst error estimation. The problem of multiple targets velocities' estimation is discussed at the end of the paper.
出处
《微波学报》
CSCD
北大核心
2015年第2期24-27,49,共5页
Journal of Microwaves
基金
国家自然科学基(61170105)
江苏省自然科学青年基金(BK2012472)
关键词
调频傅里叶变换
频率步进
速度估计
运动补偿
chirp-Fourier transform,steppe-frequency,speed estimation,motion compensation
