HY-2卫星星载DORIS和SLR的cm级综合精密定轨仿真研究

Simulation of Centimeter-Level Precise Orbit Determination for HY-2 Satellite Using DORIS and SLR

为了实现cm级HY-2卫星精密定轨,提出了基于DORIS和SLR的HY-2卫星综合定轨方法。模拟了DORIS信标站与SLR跟踪站的观测数据,确定了定轨方法和流程,探讨了分别赋予不同观测精度时各定轨精度,并分别分析了不同的信标站分布以及两种观测技术综合精密定轨中权对定轨精度的影响。实验表明,观测精度的高低直接影响着单一技术的定轨精度;优化信标站的分布,可明显提高定轨精度并节约计算时间;多种技术综合定轨时,合理分配各观测量的权可使定轨精度达到最佳;分别赋予DORIS和SLR观测量0.3mm/s和10mm的权,则使HY-2卫星定轨精度达到cm级。

In order to achieve the centimeter-level precise orbit determination for the HY-2 satellite, the methods of orbit determination based on DORIS and SLR are discussed. We have simulated DORIS and SLR observation data for the HY-2 satellite, defined the methods and processes of precise orbit determination. In addition we have discussed the orbit determi- nation accuracy using simulated data given different observation errors, and analyzed the im- pact of different distribution of ground beacons on orbit determination accuracy and consu- ming time. In order to obtain more accuracy results, we also analyzed the effect of two ob- servation technique weights on orbit determination accuracy. Experiment results indicate that the optimization of beacon stations can significantly improve the orbit determination precision and save consuming time. Reasonable weights on a variety of technology measurements can make the accuracy of result to achieve the best during the integrated technology orbit deter- mination, if we give DORIS and SLR observations 0.3 mm/s and 10 mm weights respective- ly, and the obit determination accuracy can achieve centimeter level.