基于数字实验场的国产测绘卫星影像定位精度评估及优化

Positioning Accuracy Evaluation and Optimization for Domestic Surveying and Mapping Satellites Images Based on Digital Experiment Field

提出了一种基于数字实验场的国产测绘卫星影像定位精度评估及优化方法。该方法利用超高分辨率遥感卫星影像及其测绘产品,在境外等无地面控制区域建立可满足国产测绘卫星全球定位评估验证需求的数字化实验场;以实验场控制基准为基础,通过构建国产测绘卫星影像的几何定位模型和精度优化模型,实现国产测绘卫星影像的定位精度评估及优化。利用天绘一号、资源三号卫星影像数据进行了实验和分析,结果表明:该方法能够在无地面控制区域对国产测绘卫星影像定位精度进行有效评估;并通过对系统误差进行补偿,显著提升影像定位精度。

A positioning accuracy evaluation and optimization method is proposed for domestic surveying and mapping satellites,which is based on digital experiment field.In the method,firstly,digital experiment field in the uncontrolled overseas regions is established utilizing ultra-high resolution remote sensing satellite imagery and its mapping products,which can meet the global positioning assessment and verification requirements for domestic mapping satellites.Subsequently,based on the established experiment field,the geometric positioning model and accuracy optimization model are built up for domestic mapping satellite.Finally,positioning accuracy assessment and optimization are realized for domestic mapping satellites based upon the above models.Experiments and analysis were carried out using the TH-1 and ZY-3 images.Test results show that the proposed method can effectively evaluate the positioning accuracy of the domestic mapping satellite images in the area without ground control,and significantly improve the positioning accuracy of the image by compensating the systematic error sources.