| 摘要: |
| 针对传统正侧视和斜视雷达无法对雷达载机前方场景进行成像的缺点，提出了一种基于距离多普勒算法(RDA)的毫米波前视合成孔径雷达(SAR)成像方法。给出了系统的结构模型，分析了系统成像原理。基于空间几何模型和回波信号形式，分析了点目标回波的多普勒历程，给出了方位向多普勒调频率，得到各相位补偿因子和距离徙动校正公式。对成像场景大小和方位向成像分辨率进行了详细分析，采用MATLAB对6个点目标进行了成像仿真，〖JP2〗并对仿真结果中点目标峰值中心的64×64点切片和方位向、距离向进行了分析。理论推导和实验仿真表明，基于RDA的前视合成孔径雷达可以对场景中目标有效成像且方位向成像分辨率可达到2 m，该系统可应用与侦查和制导领域。 |
| 关键词: 前视合成孔径雷达 毫米波；距离多普勒；成像；前视；方位向；距离向 |
| DOI： |
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| 基金项目:国防装备预研项目(40405050302)；装备预研基金项目（9140A17010213Bq03003） |
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| A millimeter-wave forward-looking SAR imaging algorithm |
| CHEN Lei,CHEN Dian-ren,LIU Ying |
| () |
| Abstract: |
| For the disadvantage that the squint-looking and side-looking synthetic aperture radar (SAR) can not image the scene in front of the radar, a new millimeter-wave forward-looking SAR imaging algorithm is presented in this paper.The system architecture model is given and the system imaging principle is analyzed.Based on the spatial geometry and the pattern of echo signals,the target echo Doppler history is analyzed,the azimuth Doppler FM ratio is deduced and a Range-Doppler algorithm (RDA)is proposed. The phase compensation factors and range migration correction fomula are given.The imaging scene′s size and azimuth imaging resolution are anlyzed in detail. Six points target imaging is simulated with MATLAB，64×64 points slice of the target peak center,peak-to-sidelobe ratio(PSLR) of azimuth and range are analyzed.Simulation results demonstrate the validity of the system and the direction resolution ratio can reach 2 meters.This system can be used in the field of investigation and guidance. |
| Key words: forward-looking SAR millimeter-wave RD imaging forward-looking azimuth range |
《电讯技术》编辑部 