微弱目标积累检测的包络移动补偿方法

利用长时间信号积累来提高低信噪比对微弱运动目标检测的性能是一种有效方法.在积累过程中目标回波有可能越距离单元走动,因此包络时延补偿是实现信号积累的首要问题.本文利用相控阵雷达可提供的波束驻留方式,提出一种基于距离拉伸和时频分析的包络移动补偿方法.该方法利用距离拉伸将不同单元中的目标回波作为暂态信号,通过时频联合处理来进行运动补偿和匹配相参积累,适用于存在越多普勒分辨单元走动的情况.给出了检测器的实现框图并进行了性能分析.仿真结果及对实测数据的处理验证了该方法的有效性.

Study on the Motion Compensation of Range Migrationfor Weak Moving Target Detection

Key issue of weak moving targets detection under lower signal noise ratio is managing to enhance the target echo energy using long time coherent integration.During integration the target may migrate from one to another across radar range and Doppler resolution cells,motion compensation should be taken into consideration to improve detector's performance.Based upon dwelling mode of radar beam in phased array radar system,this paper presents a novel detection framework which using range stretching and joint time frequency processing to fight against the case where range and Doppler cells of echoes migration is presented.A possible realization diagram of such a detector is suggested and performance analysis is given.Simulation results and experiments on real data confirm the effectiveness of this method.