利用视线向量的资源三号卫星影像严格几何处理模型

Building of Rigorous Geometric Processing Model Based on Line-of-Sight Vector of ZY-3 Imagery

根据资源三号立体测绘卫星三线阵传感器的成像原理,利用卫星影像的视线角等状态构建资源三号卫星影像的严格几何处理模型。经验证发现,因资源三号卫星视线角及相机安置等卫星状态获取存在误差,在无控状态下直接利用卫星姿态数据和严格几何处理模型进行定位精度较差。为有效消除卫星轨道位置、姿态角元素等存在的固定系统误差,引入视线向量修正模型进行修正,修正后精度提升明显,平坦区域仅采用3个地面控制点在X和Y方向的定位精度即可优于3m。

A rigorous geometric processing model for ZY-3 satellite images based on image- forming principles for three-line array sensors equipped in ZY-3 was built using satellite state data such as the line-of-sight angle. The validation results show that positional accuracy was not good when satellite state data and a rigorous geometric processing model was directly applied without processing. This was caused by errors created when obtaining satellite state data such as the line-of-sight angle and sensor position. In order to decrease original system errors in satellite orbital position and attitude angles, a modified model based on the line-of-sight vector was introduced to modify these system errors. After the processing, positonal accuracy in flat areas was more precise than 3 meters even when only 3 control points were included in x-y directions.