基于分数时延的宽带雷达长时间积累方法研究  

Study on Wideband Radar Long-Term Integration Method Based on Fractional Delay

作　　者：胡蜀徽[1] 周宇[1] 

机构地区：[1]中国电子科技集团第二十九研究所,成都610036

出　　处：《火控雷达技术》2015年第4期40-44,54,共6页Fire Control Radar Technology

摘　　要：宽带雷达有利于实现目标识别和分类,能够提高雷达的目标检测能力,可以精确测量目标的位置和运动参数,有效对抗各种有源和无源干扰,具有更好的低截获性能等优势。长时间积累可以延长雷达的作用距离,提高对低可探测性目标的检测能力。在积累过程中运动目标的回波会跨距离单元走动,从而影响相参积累的性能。根据目标的径向速度计算出不同脉冲间的包络走动距离对回波进行补偿,若目标回波真实延迟是采样周期的分数倍,则会产生补偿误差。为实现包络走动距离的精确补偿,通过对分数时延滤波器设计方法及长时间积累原理的分析,引入基于分数时延滤波器的时延方法,提出针对目标长时间积累的实现结构,并仿真证明该方法的有效性。Wideband radar has many advantages like benefit to implement classification and recognition of targets,be capable of improving target detectability,be able to measure target location and moving parameters precisely,be capable of countering various active and passive jamming effectively,good low probability of interception and so on.Long- term integration method can extend radar operational range,and increase the ability of detecting low observable target. The echo of moving target may walk from one range bin to another during integration,thereby effect capability of coherent integration. The echo is compensated by calculating envelope walk range among different pulses on basis of radial velocity of the target. If the real delay of the target echo is factional times of sampling period,the compensation error will be generated. In order to implement precise compensation for the envelop walk range,the time delay method based on factional time delay filter is introduced by analyzing factional time delay filter design method and long term integration principle,and implementing structure aiming at target long term indication is presented,and its effectiveness is proved by simulation.

关 键 词：宽带雷达 长时间积累 距离走动 分数时延 

分 类 号：TN957[电子电信—信号与信息处理]