欢迎访问中国科学院大学学报,今天是

中国科学院大学学报 ›› 2020, Vol. 37 ›› Issue (6): 798-804.DOI: 10.7523/j.issn.2095-6134.2020.06.011

• 电子科学 • 上一篇    下一篇

基于距离方程组的机载SAR图像立体定位方法

潘志刚, 王超, 曹舸   

  1. 中国科学院空天信息创新研究院, 北京 100190
  • 收稿日期:2019-03-11 修回日期:2019-11-27 发布日期:2020-11-15
  • 通讯作者: 潘志刚
  • 基金资助:
    国家自然科学基金(61471340)资助

Stereo localization method for air-borne SAR image based on range equations

PAN Zhigang, WANG Chao, CAO Ge   

  1. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2019-03-11 Revised:2019-11-27 Published:2020-11-15

摘要: 提出一种基于距离方程组的机载SAR图像立体定位方法,该方法使用同一成像区域的3幅SAR图像进行无控制点定位,首先确定目标在3幅图像中对应的同名像点,解析该像点对应的雷达平台瞬时经纬度坐标、海拔高度以及目标到雷达平台的斜距值,在地心坐标系下建立3幅图像对应同名像点的距离方程组,对非线性方程组进行求解得到同名像点基于地心坐标系的坐标值,并通过坐标转换得到目标点的经纬度坐标及海拔高度,实现三维定位。对影响定位精度的系统误差因素进行仿真分析,利用实飞的机载SAR图像进行目标定位实验,结果验证了该方法的有效性。

关键词: 合成孔径雷达, 立体定位, 距离多普勒模型, 距离方程组

Abstract: A method of stereo localization for airborne SAR image based on range equations is proposed. This method uses three SAR images of the same imaging area to implement stereo localization without control points. Firstly, the corresponding image points (CIP) in the three images are determined, and the platform parameters corresponding to the CIP such as instantaneous geographic coordinates, altitude, and slant range are analyzed. The range equations for the CIP of three images are established in the geocentric coordinate system. The geocentric coordinates of the CIP are obtained by solving range equations, the geographic coordinates and altitude are obtained by coordinate transformation, so as to realize the three-dimensional positioning. The system error factors affecting the accuracy of stereo localization are simulated and analyzed. The positioning experiment is carried out using the actual flight airborne SAR image. The results show that the proposed method is effective.

Key words: synthetic aperture radar(SAR), stereo localization, range-Doppler model, range equations

中图分类号: