宽带雷达目标特性建模与回波仿真  

Wide-Band Radar Target Modeling and Echo Simulation

作　　者：姜淼 张培瑶 李俊平 盛蒙蒙 JIANG Miao;ZHANG Peiyao;LI J unping;SHENG Mengmeng(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,China;Beijing Racobit Electronic Information Technology Co.,Ltd.,Beijing 100081,China)

机构地区：[1]北京理工大学信息与电子学院,北京100081 [2]北京理工雷科电子信息技术有限公司,北京100081

出　　处：《上海航天》2019年第4期71-75,共5页Aerospace Shanghai

摘　　要：根据宽带雷达目标电磁散射特性,采用基于几何绕射理论的GTD(几何绕射)模型对目标电磁散射特性进行建模;在此基础上,构建宽带雷达目标回波信号模型,结合回波信号特征,提出了一种基于去斜的宽带雷达目标回波仿真方法。对宽带雷达发射信号进行去斜处理以及傅里叶变换,得到去斜后的频域发射信号,将该信号与表征目标频域散射特性的数据在频域相乘并进行逆傅里叶变换,实现时域卷积,获取去斜后的宽带雷达回波信号。经过ISAR(逆合成孔径雷达)处理,对回波数据进行成像,验证了该方法的有效性。该方法能够有效减少运算量,降低工程化实现难度,可用于ISAR回波信号模拟设备。According to the electromagnetic scattering characteristics of wide-band radar target,the GTD(geometrical theory of diffraction)model based on the geometrical theory of diffraction is adopted to get the electromagnetic scattering characteristics model of the target.On this basis,the wide-band radar echo signal model is constructed?Combined with the echo signal characteristics,a wide-band radar echo simulation method based on dechirp is proposed.The transmitting signal in frequency domain after dechirp can be obtained by dechirp processing and Fourier transform.By multiplying this signal with the data representing the scattering characteristics of the target in frequency domain and the inverse Fourier transform,the echo signal after dechirp in time domain is obtained.By ISAR(inverse synthetic aperture radar)processing,the imaging result of echo data is obtained,which can verify the validity of the method.This method can reduce the computational complexity and the difficulty of engineering implementation,which can be used in ISAR echo signal simulation equipment.

关 键 词：宽带雷达 目标散射特性 几何绕射理论 回波仿真 去斜 

分 类 号：TN955[电子电信—信号与信息处理]