调频步进雷达运动目标信号处理的新方法

调频步进雷达是一种距离高分辨率的雷达体制,但是会产生目标冗余的问题.目标抽取算法就是消除这种冗余,提取目标真实位置的方法.对于这种雷达体制,目标运动是影响其性能的主要原因.本文分析了目标抽取算法的特点及速度、速度估计误差对此方法的影响.为克服速度造成的包络走动影响,本文提出了一种改进的目标抽取算法。这种方法在可以准确估计目标速度时具有很好的性能,但是随着速度估计误差增大,性能有所下降.本文给出了速度估计误差的界限,以便尽量减少速度估计误差引起的问题.此外,本文还提出了另一种幅度内插的方法,很好地解决了速度估计误差造成的距离耦合时移问题.计算机仿真的结果验证了理论分析的正确性.这两种方法,尤其是后面幅度内插的方法,可以解决调频步进雷达运动目标处理的关键问题,为这种雷达体制的实用化奠定了基础.

Novel Signal Processing Methods for Moving Targetsin Stepped Frequency Modulated Radar

Modulated stepped frequency radar is a system to get high resolution range profile with the problem of redundancy.So extracting method is presented to eliminate such redundancy and get the true position of target.In this radar system,target motion is the main factor to influence its performance.Characteristics of extracting method are analyzed here,so do the effects of velocity and velocity estimated error on this method.In order to overcome the influence of return pulse motion,an improved extracting method is provided.The capability of this improved method is good with accurate velocity estimation,but decreases with increasing velocity estimated error.The velocity estimated error limit is addressed to reduce the problem caused by it as far as possible.In addition,an amplitude interpolating method is given to resolve the range coupling shift caused by velocity estimated error.The emulated computer results validate the correctness of theory analysis.These two suggested methods,especially the later amplitude interpolating method,can settle the key problems of target moving in the signal processing of modulated stepped frequency radar and provide foundation for realization of such radar system.