高速机动目标信号多普勒频移补偿方法  

Doppler Frequency Shift and Coherent Integration Performance of High Speed Maneuvering Targets

作　　者：董鹏曙[1] 向龙[1] 谢幼才[1] 金加根[1] 

机构地区：[1]空军预警学院,湖北武汉430019

出　　处：《探测与控制学报》2016年第3期66-70,74,共6页Journal of Detection & Control

摘　　要：针对高速机动目标多普勒频率展宽引起的相参积累散焦损失等问题,提出了易于工程实现的目标回波信号预处理方法。该方法构建了多普勒频移变化与加速度、角速度的关系模型。理论分析和仿真表明:在动目标检测(MTD)中相参积累散焦损失由多普勒频移变化率等多个因素所决定,其大小在-20lg N dB至0dB之间(N为相参积累的脉冲数)。通过提出的多普勒频移补偿方法,可有效消除多普勒频率展宽对MTD相参积累的影响,提高雷达在复杂杂波背景中对高速机动目标的检测能力。Aiming at the coherent accumulation defocusing losses issue caused by Doppler frequency broadening of high speed maneuvering target,a target echo signal pre-processing method which could be easily realized in engineering was proposed.The influence of targets high speed and maneuvering to Doppler frequency was analyzed,and a relationship model of Doppler frequency shift associated with acceleration and turning rate was established.Theoretical analysis and simulation results demonstrated that the coherent integration defocused loss of MTD depended on Doppler frequency shift rate and other several factors,which was changed between-20 lgN dB and 0dB(N is the pulse number for coherent integration).With motion compensation,the influence of Doppler frequency shifted to the MTD coherent integration could be eliminated effectively;the detection ability of radar to high speed and maneuvering target in complex background could be enhanced.

关 键 词：高速机动目标 运动补偿 检测 多普勒频移变化率 

分 类 号：TN957[电子电信—信号与信息处理]