| 天线波束指向控制对TOPSAR成像质量的影响 |
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| 引用本文： | 吴越,李春升,王鹏波,陈杰.天线波束指向控制对TOPSAR成像质量的影响[J].宇航学报,2012,33(4):487-491. |
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| 作者姓名： | 吴越 李春升 王鹏波 陈杰 |
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| 作者单位： | 北京航空航天大学电子信息工程学院,北京,100191 |
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| 摘 要： | 星载TOPSAR模式天线波束指向控制对其成像质量有重要影响。基于成对回波原理,分析了星载TOPSAR模式波束指向控制对方位向信号的调制规律,建立了星载TOPSAR模式方位向波束指向步进控制的数学模型,并利用傅里叶级数展开给出了波束步进控制下的天线方向图表达式,最终推导出了方位向成对回波的幅度和位置的表达公式,定量描述了波束指向步进控制与成对回波幅度和位置之间的联系,为星载TOPSAR模式波束指向步进控制指标的合理设计奠定了基础。最后,计算机仿真表明了理论分析结果的正确性。
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| 关 键 词： | 合成孔径雷达 TOPSAR模式 波束指向控制 成对回波 |
Effects of Antenna Beam Steering on TOPSAR Imaging Quality |
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| WU Yue
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LI Chun-sheng
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WANG Peng-bo
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CHEN Jie.Effects of Antenna Beam Steering on TOPSAR Imaging Quality[J].Journal of Astronautics,2012,33(4):487-491. |
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| Authors: | WU Yue LI Chun-sheng WANG Peng-bo CHEN Jie |
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| Institution: | (School of Electronic Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100191,China) |
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| Abstract: | The step-by-step steering of antenna beam for spaceborne TOPSAR(Terrain Observation by Progressive Scan SAR) mode has significant impacts on image quality.The modulation law of spaceborne TOPSAR mode beam steering for azimuth signal is analyzed,and a mathematical model of azimuth beam step-by-step steering is implemented.Besides,based on the theory of paired echoes,the formulas of the amplitude and position of azimuth paired echoes are derived.The relationship between beam stepped steering and both amplitude and position of paired echoes is quantitatively described.Finally,the computer simulation is used to verify the validity of theoretical analysis. |
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| Keywords: | Synthetic aperture radar(SAR) TOPSAR mode Beam steering Paired echoes |
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