航空学报 > 2005, Vol. 26 Issue (2): 208-213

方位扫描SAR区域成像研究

朱岱寅, 朱兆达   

  1. 南京航空航天大学 电子工程系, 江苏 南京 210016
  • 收稿日期:2004-03-08 修回日期:2004-09-23 出版日期:2005-04-25 发布日期:2005-04-25

Study on Patch Mapping by Azimuth Scan SAR

ZHU Dai-yin, ZHU Zhao-da   

  1. Department of Electronic Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2004-03-08 Revised:2004-09-23 Online:2005-04-25 Published:2005-04-25

摘要: 研究在SAR区域成像中,通过天线波束方位扫描扩大成像区方位宽度的机理以及信号处理方法。首先描述天线波束扫描的几何关系,推导出为达到要求的成像分辨率以及成像区方位宽度所需的天线波束扫描角速度和扫描角度的计算公式。分析了成像区位置与载机航迹的几何关系。然后讨论方位扫描SAR区域成像信号处理方法,并给出系统点目标响应仿真结果。最后,用试飞实测数据成像做了验证。

关键词: 合成孔径雷达, 天线波束扫描, 区域成像, 扫描角度, 扫描角速度

Abstract: The operation and processing for an azimuth scan mode patch-mapping synthetic aperture radar (SAR) system are studied, which serves for moderate fine-resolution mapping of medium-sized terrain patches. First, the geometry of the scan mode is depicted, and the scan angular velocity and scan angular scope are determined according to the desired imagery patch size and cross-range resolution respectively. Then, the geometric relation between the mapped area and the flight path of the antenna is determined. The signal processing approaches are discussed in the following. The linear range Doppler and polar format algorithms are employed in image formation, and simulation is conducted to get the point target response. Finally, the experimental result of the test campaign with the described system is also presented to verify the proposed scheme.

Key words: synthetic aperture radar (SAR), beam scan, patch-mapping, scan angular velocity, scan angular scope

中图分类号: