基于天基发射源的SISAR全息信号表示及其成像方法  

Radio holographic signal expression and shadow imaging method of space-based SISAR

作　　者：马恒[1] 许江宁[1] 朱涛[1] 

机构地区：[1]海军工程大学导航工程系,湖北武汉430033

出　　处：《系统工程与电子技术》2010年第4期694-698,共5页Systems Engineering and Electronics

摘　　要：针对地基双基地前向散射栅栏雷达只能探测低空飞行器且侧影轮廓像不能直接表现目标侧影等问题,提出利用天基发射源组成天基阴影逆合成孔径雷达(shadow inverse synthetic aperture radar,SISAR),分析了天基SISAR在探测高度、探测效果及成像上的优势。在地基SISAR侧影成像原理的基础上,重新定义了坐标系统,推导了天基SISAR下目标全息信号的公式。分析其成像原理,提出在小衍射角条件下,目标顶部轮廓与目标全息信号之间实际上是经过幅度压缩后的傅里叶变换关系。仿真实验证明了目标顶部轮廓与目标全息信号关系的正确性。The present bistatic forward scattering barrier radar can only detect the low altitude stealthy target,and its shadow image is not directly equal to the silhouette of targets.In view of these problems,this paper puts forward a SISAR based on space transmitter and analyzes its advantages in detection and shadow imaging.Then a new SISAR coordinate system is redefined and a new expression of radio holographic signals（RHS） is deducted based on the shadow imaging theory in ground bistatic barrier radar.The conclusion is drawn that the radio holographic signal is the Fourier transform of the scaled outline of targets according to shadow imaging theory.Simulation experiments prove the correctness of this conclusion.

关 键 词：阴影逆合成孔径雷达 阴影成像 坐标变换 前向散射 

分 类 号：TN958[电子电信—信号与信息处理]