提高星载合成孔径雷达图像几何校正精度的算法

依据合成孔径雷达 (SAR)距离方程和多普勒方程 ,用 SAR成像参数可实现 SAR图像的几何校正。星载 SAR平台存在定位误差 ,特别是在轨迹向和垂直轨迹向 ,将影响几何校正的精度 ,主要是降低图像的几何逼真度及增大目标定位误差。文中提出了采用有限数量的地面控制点抑制卫星在轨迹向和垂直轨迹向的定位偏差 ,从而有效地提高了 SAR图像的几何校正精度

An Algorithm Improving Geometric Calibration of Spaceborne SAR Image

According to the Range Doppler equations,the geometric calibration of SAR image can be realized using SAR imaging parameters.The satellite positioning errors,especially in along track and cross track direction,can mostly result in degradation in image fidelity and increment in target position error.Using a number of ground control points(GCP)to restrain satellite position bias errors,we can effectively improve precision of geometric calibration.