结合景象匹配与惯导信息的SAR平台定位方法

发布时间：2018-11-20 19:46

【摘要】：利用高度传感器提供高度信息,结合高精度异源图像匹配技术与惯导系统漂移修正方法实现SAR平台定位。根据成像中间时刻SAR平台与SAR图像中心线上物点在水平面的投影共线的特性,在单帧图像中心线上均匀选取若干点与光学基准图进行高精度景象匹配;计算平台在水平面上投影位置,并利用高度信息确定其空间位置;使用序列图像定位结果估计惯导系统漂移参数,对惯导系统输出的位置数据进行修正,实现高精度的SAR平台定位。对各误差因素的影响进行分析,推导了精度估计公式。仿真和实际序列图像实验结果表明,方法正确可行,具有较高的平台定位精度,具备一定工程实用价值。
[Abstract]:Using height sensor to provide height information, combining with high precision heterologous image matching technology and inertial navigation system drift correction method to achieve SAR platform positioning. According to the characteristics of the projection collinear between the SAR platform and the object point on the center line of SAR image in the horizontal plane, a number of points on the center line of a single frame image are uniformly selected to match the optical reference image with high precision scene matching. The projection position of the platform on the horizontal plane is calculated, and the spatial position of the platform is determined by using the height information. The drift parameters of inertial navigation system (ins) are estimated by using the sequence image localization results, and the position data of ins output are corrected to achieve high precision SAR platform positioning. The influence of various error factors is analyzed and the accuracy estimation formula is derived. The simulation and experimental results show that the method is correct and feasible, and has high accuracy of platform positioning, and has practical value in engineering.
【作者单位】：国防科技大学航天科学与工程学院;国防科技大学图像测量与视觉导航湖南省重点实验室;中国人民解放军96656部队;
【基金】：国家重点基础研究发展计划资助项目(2013CB733100)
【分类号】：TN957.52

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