【作者】 徐韶光； 熊永良； 张文皓； 赵班； 张芮；

【Author】 Shaoguang Xu;Yongliang Xiong;Wenhao Zhang;Ban Zhao;Rui Zhang;Faculty of Geoscience and Environmental Engineering,Southwest Jiaotong University;School of Civil and Environmental Engineering,University of New South Wales;

【机构】 西南交通大学； 新南威尔士大学；

【摘要】 低轨卫星精密轨道确定是空间气象、大地测量和遥感等领域得以应用的前提。为提高准确度和计算效率,这里建议一种逐历元确定低轨卫星精密轨道的几何法。利用GRACE、CHAMP和GOCE等低轨卫星GPS观测量采用卡尔曼滤波逐历元确定精密轨道。通过几何法的解算结果与简化动力学结果进行对比显示,在卫星颗数充分的情况下(≥6),几何法定轨精度与简化动力学定轨精度相当,可以达到厘米级的准确度如3-4 cm。这意味着随着GNSS多星座的发展和完善,低轨卫星接收的GNSS观测量越多,其几何条件可以得到改善的幅度越大,那么几何法将有可能取代简化动力学法成为低轨卫星轨道精密确定的主流方法。。更多还原

【Abstract】 Precise orbit determination of the LEO is the base for application of spatial meteorology,geodesy and remote sensing.In order to improve the accuracy and simply the computation burden,geometric method of precise orbit determination epoch by epoch is purposed in this paper.GNSS observations from GRACE,CHAMP and GOCE are used for precise orbit determination by kalman filter for test.The results of geometric solution are compared to the results of reduced-dynamic solution and other institutes,it shows that the geometric solution’s accuracy is generally similar to the reduced-dynamic one if there are enough GPS satellites(≥ 6) to be tracked,and the geometric solution’s accuracy can reach centimeter level such as 3-4 cm accuracy.These results mean that with the development and complement of multi GNSS,the Low earth orbiter can track more and more observations,the geometric condition can be improved largely,then the geometric method may replace the reduced-dynamic method as a main method for the low earth orbiter orbit determination in the future.更多还原