抗差估计在天绘一号卫星定轨中的应用

Application of Robust Estimation in TH -1 Orbit Determination

本文首先将抗差估计引入动力平滑中，构建了卫星轨道的抗差动力平算法，然后分别采用动力平滑和抗差动力平滑对天绘一号卫星进行定轨计算，最后采用重叠弧段法进行轨道精度评定。结果表明：①天绘一号卫星轨道的重叠弧段不符值小于2米；②采用抗差估计的动力平滑轨道的内部精度优于采用最小二乘估计的动力平滑轨道精度。

The paper firstly introduces the robust estimation into the dynamic orbit smoothing, and designs a robust dynamic orbit smoothing algorithm. Then the TH - 1 satellite orbits are determined using the dynamic orbit smoothing and the robust dynamic orbit smoothing algorithm respectively. Finally, the accuracy of satellite orbit is evaluated using orbit overlap arc method. The results indicate that the discrepancy of TH - 1 satellite orbit overlap arcs is less than 2 meters, and the internal accuracy of dynamic orbit smoothing orbits using the robust estimation is better than that using the least squares estimation.