一种基于极化分解特征和SVDD的扩展目标检测算法  

A range spread target detection algorithm based on polarimetric features and SVDD

作　　者：李强[1] 姚远昕 孔祥琦 LI Qiang;YAO Yuanxin;KONG Xiangqi(Agency Service Bureau of the Ministry of Industry and Information Technology,Beijing 100804,China;West Institute of CAICT,Chongqing 401336,China;The State Radio Monitoring Center Testing Center,Beijing 100041,China)

机构地区：[1]工业和信息化部机关服务局,北京100804 [2]中国信息通信研究院西部分院,重庆401336 [3]国家无线电监测中心检测中心,北京100041

出　　处：《电信科学》2023年第10期64-73,共10页Telecommunications Science

摘　　要：多极化距离高分辨雷达是地面静止目标检测的重要手段,其回波中目标占据多个距离单元,成为扩展目标。传统基于回波能量的扩展目标检测方法的性能随信杂比的降低而下降。提出一种基于极化分解特征的扩展目标检测算法,利用目标和杂波之间的极化散射特性差异提升低信杂比下的检测性能。所提方法提取16种极化分解特征组成特征向量作为检测统计量,再使用支持向量数据描述(SVDD)算法估计判别门限。在判别门限的训练阶段,杂波数据的极化分解特征被提取用作训练数据。并且为保证虚警概率,在SVDD的目标函数中引入了两个惩罚参数。使用实测数据进行了实验验证,所提方法在戈壁背景、虚警概率为10-4、检测概率为90%的情况下,所需信杂比约为12.6 dB,相较于基于能量的对比方法降低约1.7 dB。Multi-polarization range high resolution radar is an important mean for ground target detection.In the echo formed by it,the target occupies multiple range cells and becomes an extended target.The traditional spread target detection method relies on energy,and the detection performance decreases when the signal-to-clutter ratio decreases.A spread target detection algorithm based on polarization decomposition features was proposed,which improved the detection performance under low signal-to-clutter ratio by using the difference of polarization scattering characteristics between target and clutter.Specifically,16 kinds of polarization decomposition features were extracted to form feature vectors as detection statistics,and then support vector data description(SVDD)was used to obtain the detection threshold.When training the detection threshold,the polarization decomposition features of clutter were extracted as training data.In order to ensure the false alarm probability,two penalty parameters were introduced into the objective function of SVDD.The experimental results show that the proposed method requires a signal-to-clutter ratio of about 12.6 dB in the case of Gobi background,false alarm probability of 10-4 and detection probability of 90%,which is about 1.7 dB lower than the energy-based methods.

关 键 词：极化高分辨雷达 扩展目标检测 极化分解 FAC-SVDD 

分 类 号：TN956[电子电信—信号与信息处理]