摘要
低轨卫星编队的精密轨道和基线确定是分布式InSAR卫星系统完成科学任务的重要前提。目前,基于GNSS数据的缩减动力学绝对和相对轨道确定是获得高精度轨道和基线产品的主要手段。本文利用天绘二号编队星载GPS实测数据,采用缩减动力学定轨方法进行编队卫星绝对和相对定轨研究。GPS数据质量分析表明,A星与B星接收机的信号跟踪能力和数据质量基本相当。通过对轨道机动进行常值加速度建模,可以有效消除机动对天绘二号编队绝对和相对定轨的影响。单星绝对定轨结果表明,6 h重叠弧段轨道差值三维(3D)RMS小于1.2 cm,A星和B星绝对轨道的卫星激光测距数据检核残差RMS分别为2.76 cm和2.33 cm。双星相对定轨结果表明,6 h重叠弧段基线差值3D RMS达到0.66 mm,本文基线产品与西安测绘研究所基线产品互比对差值RMS在径向、切向、法向和3D方向分别为0.73、1.11、0.51和1.43 mm。
Precise orbit and baseline determination of formation-flying low Earth orbiters are prerequisites for the success of distributed InSAR satellite system mission.GNSS-based reduced-dynamic absolute and relative orbit determination method is the main method to obtain high-precision orbit and baseline products.The absolute and relative orbit determination for TH-2 satellite system is researched using the space-borne GPS data.The results show that the signal tracking abilities and data qualities of the receivers equipped on satellite A and satellite B are almost the same.By modeling orbital maneuvers with constant empirical accelerations,the influences of orbital maneuvers on absolute and relative orbit determination for TH-2 satellite formation can be effectively eliminated.For single-satellite absolute orbit determination,the three-dimensional(3D)RMS of 6 h overlapping orbit differences is less than 1.2 cm.The RMS values of satellite laser ranging data validation residuals for satellite A and satellite B are 2.76 cm and 2.33 cm,respectively.For dual-satellite relative orbit determination,the 3D RMS of 6 h overlapping baseline differences is about 0.66 mm.Baseline comparison RMS with the products of Xi’an Research Institute of Surveying and Mapping are 0.73 mm,1.11 mm,0.51 mm and 1.43 mm in radial,tangential,normal and 3D direction,respectively.
作者
邵凯
张厚喆
秦显平
黄志勇
易彬
谷德峰
SHAO Kai;ZHANG Houzhe;QIN Xianping;HUANG Zhiyong;YI Bin;GU Defeng(College of Liberal Arts and Sciences, National University of Defense Technology, Changsha 410073, China;Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China;Information Engineering University, Zhengzhou 450001, China;TianQin Research Center for Gravitational Physics and School of Physics and Astronomy, Sun Yat-sen University (Zhuhai Campus), Zhuhai 519082, China)
出处
《测绘学报》
EI
CSCD
北大核心
2021年第5期580-588,共9页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(41874028)。
