北京航空航天大学学报 ›› 2000, Vol. 26 ›› Issue (3): 282-285.

• 论文 • 上一篇    下一篇

星载SAR天线指向稳定度对成像质量的影响

黄岩, 李春升, 陈杰, 周荫清   

  1. 北京航空航天大学 电子工程系
  • 收稿日期:1998-12-02 出版日期:2000-03-31 发布日期:2010-09-27
  • 作者简介:黄 岩(1971-),女,北京人,博士生,100083,北京.

Effects of Stability of Antenna Pointing on Spaceborne SAR Imaging Quality

HUANG Yan, LI Chun-sheng, CHEN Jie, ZHOU Yin-qing   

  1. Beijing University of Aeronautics and Astronautics,Dept. of Electronic Engineering
  • Received:1998-12-02 Online:2000-03-31 Published:2010-09-27

摘要: 从星载合成孔径雷达(SAR)天线指向不稳定对成像质量影响的角度研究天线指向稳定度.对均匀加权天线,详细推导了天线指向不稳定引起的成对回波的位置和幅度,分析了成对回波对点目标冲激响应的峰值旁瓣比、积分旁瓣比的影响.研究了天线指向不稳定造成的多普勒中心频率误差,根据多普勒中心频率误差与图像位置偏移的关系,给出了图像质量对天线指向稳定度的要求.最后进行了计算机仿真,验证了分析结果.

Abstract: The stability of antenna pointing is researched from the viewpoint of the effects of antenna pointing instability of spaceborne synthetic aperture radar(SAR) on image quality. Based on uniformity weighting antenna, the location and amplitude of the paired-echo resulting from instability of antenna pointing are derived in detail. And the effects of paired-echo on peak sidelobe ratio and integrated sidelobe ratio of impulse response function are analyzed. Moreover the Doppler center frequency error due to instability of antenna pointing is studied. According to the offsets of SAR imaging dependant on the Doppler center frequency error, the required stability of antenna pointing is given. At last the computer simulation is made to verify the analysis.

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