一种星敏感器/陀螺地面高精度组合定姿与精度验证方法

A Method of High-Precision Ground Processing for Star Sensor and Gyro Combination and Accuracy Verification

卫星姿态精度是制约高分辨率光学影像几何定位精度的一个重要因素,针对当前卫星姿态数据处理精度不高且难以验证的问题,提出一种基于双向滤波整体加权平滑的高精度卫星姿态数据地面处理算法,实现了卫星姿态数据地面精细化处理,进一步采用几何定标场的数字正射影像图/数字高程模型数据进行精度验证。以2014年11月发射的遥感-24号高分辨率光学卫星为例,分析结果表明,本文设计的姿态数据处理模型是稳健可靠的,姿态数据相对精度可以达到0.8″,且基于地面处理姿态数据得到的全色相机无控制点条件下影像几何纠正精度可以达到15m。

The accuracy of satellite attitude data is an important factor restricting the geometric positioning accuracy of high-resolution images.For the current problems that the accuracy of satellite attitude data processing is not high and data assessment is difficult,an algorithm of satellite attitude data ground processing is proposed based on bilateral filtering and overall weighted smoothing to achieve high-accuracy processing for attitude data.Furthermore,the numbers are digital orthophoto map and digital elevation model reference data of geometric calibration field is used for accuracy assessment.By using high-resolution optical satellite of Yaogan-24 launched in November 2014 as an example,the processing results illustrate that the proposed method is robust and feasible.The relative accuracy of attitude data can reach 0.8″,and the positioning accuracy of panchromatic camera geometric correction image can increase to 15 m via using the refinement attitude data.