天绘一号卫星境外几何定位精度初步验证

First results of geometrical positioning evaluation of TH-1 satellite at abroad

为验证天绘一号卫星在境外的几何定位精度,采用区域网平差的原理与方法对RPC模型、系统误差模型、RPC模型等进行描述,并选择国外几何定位精度较高的WorldView影像作为控制数据对其RPC模型定位精度进行评价.研究结果表明:天绘一号卫星的平面精度约为10.253 m,高程精度约为3.892 m;选择合理的平差数学模型和控制点分布进行平差后,可以较为显著的提高其平面定位精度,而高程定位精度改善并不明显.

To evaluate the positioning precision of TH-1 satellite at abroad, this paper briefly described the theory of the RPC sensor model, system err model and RPC block adjustment first. Then the World View images were chosen as control datas to evaluate the geometrical positioning of TH-1 satellite. The experiments demonstrated that the planar accuracy and vertical accuracy were about 10.253 meters and 3.892 meters. The planar positioning accuracy was improved greatly using right block math model and GCP distribution when the vertical positioning accuracy was almost unchanged.