转发式干扰条件下LFM雷达的检测概率估计  

LFM radar detection probability estimation under repeater jamming

作　　者：田元荣 王俊迪 吴笑天 TIAN Yuanrong;WANG Jundi;WU Xiaotian(Institute of Electronic Countermeasure,National University of Defense Technology,Hefei 230037,China;Institute of Aeronautics Engineering,Air Force Engineering University,Xi’an 710038,China)

机构地区：[1]国防科技大学电子对抗学院,安徽合肥230037 [2]空军工程大学航空工程学院,陕西西安710038

出　　处：《系统工程与电子技术》2024年第2期497-504,共8页Systems Engineering and Electronics

基　　金：国家自然科学基金(62001489)资助课题。

摘　　要：对多雷达干扰效果评估的难点在于分析干扰机对非目标雷达的影响。针对干扰机转发一部线性调频(linear frequency modulation,LFM)雷达的信号无意干扰另一部LFM雷达时的检测概率估计问题,首先计算了被干扰雷达对干扰信号在空域、频域和时域上的接收增益;其次将干扰信号在判决单元中的统计特性建模为非中心卡方分布,并给出了检测概率和虚警概率的计算方法。仿真结果表明,在一部干扰机的无意干扰下,估计的检测概率可作为被干扰雷达检测概率的上限;为达到同样的干扰效果,转发非目标雷达的信号实施干扰,比转发目标雷达的信号进行干扰所需的干扰功率更少。The difficulty in evaluating the effectiveness of multi-radar jamming lies in analyzing the impact of jammers on non target radars.In response to the problem of estimating the detection probability when a jammer unintentionally interferes with another linear frequency modulation(LFM)radar by forwarding a signal from one LFM radar,the reception gain of the jammed radar in the spatial,frequency,and time domains of the interference signal is calculated firstly.Secondly,the statistical characteristics of the interference signal in the decision unit are modeled as a non-central chi-square distribution,and the calculation methods for detection probability and false alarm probability are provided.The simulation results show that under the unintentional interference of a jammer,the estimated detection probability can serve as the upper limit of the detection probability of the jammed radar.To achieve the same jamming effect,transmitting signals from non target radars requires less jamming power than transmitting signals from target radars.

关 键 词：线性调频雷达 转发干扰 无意干扰 雷达检测概率 非相参积累 

分 类 号：TN974[电子电信—信号与信息处理]