外源雷达空时联合恒虚警检测分析与实验  

Analysis and Experiment on Space-Time Joint CFAR Detection Method for Passive Radar

作　　者：邹俊杰 程丰[1] 万显荣[1] ZOU Junjie;CHENG Feng;WAN Xianrong(School of Electronic Information,Wuhan University,Wuhan 430072)

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《雷达科学与技术》2022年第4期415-420,428,共7页Radar Science and Technology

基　　金：国家自然科学基金(No.61931015,62071335);湖北省技术创新专项重大项目(No.2019AAA061);湖北省自然科学基金创新群体项目(No.2021CFA002)。

摘　　要：外辐射源雷达杂波呈现复杂形态,其中在距离多普勒谱中固定分布的剩余杂波(简称固定杂波)局部强度较高,采用空域恒虚警检测方法会造成连续的虚警,严重影响目标检测性能。本文通过实测数据分析发现,固定杂波强度在时域变化平稳,可采用时域杂波图检测方法减少该类杂波造成的虚警。然而,非理想信号波形导致外辐射源雷达目标回波具有较高的副峰和旁瓣,仅采用杂波图检测方法会导致重复检测和虚假航迹。通过分析空域和时域恒虚警检测方法面临的问题,本文提出了针对外辐射源雷达的空时联合恒虚警检测方法。该方法在不影响检测概率的前提下,减少了单一恒虚警检测方法造成的虚警。实测数据处理结果验证了所提方法的有效性。The clutter of passive radar presents complex patterns,and the residual clutter with fixed distribution in range-Doppler spectrum has a high local intensity.The space domain CFAR causes continuous false alarms,which will seriously affect the performance of target detection.The analysis of measured data shows that the intensity of fixed clutter changes smoothly in time domain.These false alarms can be reduced by using clutter map detection method.However,the non-ideal signal waveform results in high sub-peak and sidelobe for passive radar.The clutter map detection method leads to repeated detection and false track in this case.By analyzing the problems of constant false alarm detection methods in space domain and time domain,this paper proposes a space-time joint CFAR method for passive radar.This method can reduce the false alarms without affecting the detection probability.The processing results of measured data verify the effectiveness of the proposed method.

关 键 词：外辐射源雷达 雷达目标检测 杂波图 空时联合 恒虚警检测 

分 类 号：TN958.97[电子电信—信号与信息处理]