摘要
恒虚警检测(CFAR)算法在目标检测领域已经得到广泛应用,但当背景杂波的分布不满足均一性时,用单一分布进行阈值计算会引起整个检测平面的虚警概率的不恒定。生命探测雷达应用的场景较复杂,在探测场景以及所处的距离单元不同时背景杂波的分布是不一样的。针对非均一的背景杂波分布,提出了基于动态杂波分布拟合的CFAR检测算法,该算法根据实测数据的频率分布与预设的分布的差值选取最优的分布拟合,再根据不同的分布来计算相应的阈值,减小由于杂波模型不匹配引起的虚警概率的不恒定。用包含两个目标的实测数据对该算法进行了验证,结果显示该算法相较于采用单一分布进行杂波拟合能够有效地减少虚假目标的出现,不仅适用于较复杂的场景也适用于多个目标的情况。
The Constant False Alarm Rate(CFAR)algorithm has been widely used in the field of target detection.However,when the distribution of background clutter does not satisfy the uniformity,threshold calculation with a single distribution will cause the false alarm probability of the entire detection plane to be not constant.The scene of life detection radar application is more complicated.The distribution of background clutter is different when different detection scenes and distance units are different.Aiming at the non-uniform background clutter distribution,a CFAR algorithm based on dynamic clutter distribution fitting is proposed.The algorithm selects the optimal distribution based on the difference between the frequency distribution of the measured data and the preset distribution,and then calculate the corresponding threshold according to different distributions,and reduce the uncertainty of the false alarm probability caused by the mismatch of the clutter model.The algorithm is validated by the measured data of two targets.The results show that the proposed algorithm can effectively reduce the occurrence of false targets,not only in complex scenes,but also in multi-target situations,compared with clutter fitting using a single distribution.
作者
陈忠诚
叶盛波
刘新
吕晓华
纪奕才
Chen Zhongcheng;Ye Shengbo;Liu Xin;Lv Xiaohua;Ji Yicai(Key Laboratory of Electronic Radiation and Sensing Technology,Chinese Academy of Science,Beijing 100190,China;Institute of Electronics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Science,Beijing 100049,China)
出处
《电子测量技术》
2019年第18期132-137,共6页
Electronic Measurement Technology
基金
国家自然科学基金(61601438)项目资助
关键词
CFAR检测
背景杂波分布
生命探测雷达
分布拟合
CFAR detection
background clutter distribution
life detection radar
distribution fitting
