摘要
前视合成孔径雷达(前视SAR)可以获取平台前下方区域的图像信息,相较于侧视SAR,前视SAR具有合成孔径短、作用距离近、距离向场景宽度较宽、方位向调频率随距离空变等特点,采用传统的SAR成像算法进行方位压缩会造成图像扇形畸变。通过分析前视阵列SAR的回波特性,在方位压缩后,将距离徙动校正(RCMC)引起的数据倾斜通过逆距离徙动校正(IRCMC)还原目标的距离信息,经过坐标映射完成地面的二维成像。最后通过仿真数据验证了本文分析的正确性和方法的有效性。
Forward-looking synthetic aperture radar(forward-looking SAR)can acquire image information in the area below the front of the platform.Compared with side-looking SAR,forward-looking SAR has the characteristics of short synthetic aperture,close action distance,wider distance-to-scene width,and azimuthal tuning frequency with distance null,etc.Azimuthal compres‐sion using traditional SAR imaging algorithm will cause image sector distortion.In this paper,by analyzing the echo characteris‐tics of the forward-looking array SAR,the data skew caused by the range cell migration correction(RCMC)is restored to the dis‐tance information of the target by the inversed range cell migration correction(IRCMC)after the azimuth compression,and the two-dimensional imaging of the ground is completed by coordinate mapping.Finally,the correctness of the analysis and the effec‐tiveness of the method are verified by simulation data.
作者
刘金升
张朝晖
韩松
Liu Jinsheng;Zhang Chaohui;Han Song(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100190,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《电子技术应用》
2023年第11期153-159,共7页
Application of Electronic Technique
关键词
合成孔径雷达
前视成像
线性调频连续波
逆距离徙动校正
synthetic aperture radar
forward-looking imaging
frequency modulated continuous wave
inversed range cell migra‐tion correction
