天绘一号卫星影像与行时对应关系检查方法研究

天绘一号卫星是一颗传输型立体测绘卫星,其职能是实现全球无控精确定位。为此,后期处理过程中需要准确获知每行影像摄影时刻的卫星姿态和轨道数据,卫星产品中的行时文件起到了影像与姿轨数据对应的桥梁作用。本文在分析影像数据、行时文件、辅助数据3者间关系的基础上,通过试验方式验证了1A级影像与行时不对应时对产品定位精度的影响,最后提出了一种有效检查影像与行时文件对应关系的方法,并对该方法进行了试验验证。

Checking Image-linetime Relationship for TH-01 Satellite

The TH-01 satellite is a transmission type mapping satellite,it’s able to realize global precise positioning without ground control point.However, precise satellite attitude and orbit parameters of every photographing time line are required in post process.Linetime data in archived satellite product actually serve as a bridge between image data and attitude and orbit data.We analyze the intrinsic relationship of image data，linetime data and auxiliary data, and the experiments demonstrate the influences of mismatch of 1A image and timeline data on positioning precision.Then, we propose an approach to checking the matching attribute of 1A image and timeline data.Processing results validate the availability of the proposed method.