Orbit determination and time synchronization of spatial information network combining sparse regional ground stations

doi:10.11947/j.AGCS.2021.20210009

Abstract

Abstract: The development of global low earth orbit (LEO) satellite communication constellations and the technology advancement of global satellite navigation system (GNSS) orbit and clock determination lay a necessary foundation for moving the continuous operation reference system (CORS) to near-Earth space, which is helpful to break through the limitation of ground reference station distribution and realize global space-based CORS positioning service with few regional ground stations. However,space information network has many different characteristics such as high dynamics, network reconstruction, and significant flexibility. How to determine the orbit of LEO satellites and time datum for a space information network with few regional ground stations is the key to realize global high-precision positioning service of the space-based CORS network. This paper studied the method of unifying space and time datum determination based on the backbone network and the access network strategy. Experiments show that an orbit determination accuracy of about 7 cm is achievable for GNSS and LEO satellites with only five ground stations in China,one in Arctic, one in Antarctica, and 12 LEO satellites. Based on the known precise orbit of space nodes, about 10 cm accuracy is realized for other LEO space nodes that did not participate in orbit determination. For the time synchronization of space information network, the inter-satellite and satellite-ground time comparison method is proposed with the strategy of network layering autonomy and new inter-satellite link. Results show that the time synchronization of 10 ns precision level can be achieved with communication signal system.

Key words: time datum, spatial datum, LEO, orbit determination, GNSS

CLC Number:

P228

CHEN Ruizhi, YU Baoguo, WANG Fuhong, GONG Xuewen, BAO Yachuan, WANG Lei, LIU Wanke, FU Wenju. Orbit determination and time synchronization of spatial information network combining sparse regional ground stations[J]. Acta Geodaetica et Cartographica Sinica, 2021, 50(9): 1211-1221.

References

[1] GE Haibo, LI Bofeng, GE Maorong, et al. Initial assessment of precise point positioning with LEO enhanced global navigation satellite systems (LeGNSS)[J]. Remote Sensing, 2018, 10(7): 984.
[2] LI Xingxing, MA Fujian, LI Xin, et al. LEO constellation-augmented multi-GNSS for rapid PPP convergence[J]. Journal of Geodesy, 2019, 93(5): 749-764.
[3] WANG Lei, CHEN Ruizhi, LI Deren, et al. Initial assessment of the LEO based navigation signal augmentation system from Luojia-1A satellite[J]. Sensors, 2018, 18(11): 3919.
[4] 王磊, 陈锐志, 李德仁, 等. 珞珈一号低轨卫星导航增强系统信号质量评估[J]. 武汉大学学报(信息科学版), 2018, 43(12): 2191-2196. WANG Lei, CHEN Ruizhi, LI Deren, et al. Quality assessment of the LEO navigation augmentation signal from Luojia-1A satellite[J]. Geomatics and Information Science of Wuhan University, 2018, 43(12): 2191-2196.
[5] 王磊, 李德仁, 陈锐志, 等. 低轨卫星导航增强技术——机遇与挑战[J]. 中国工程科学, 2020, 22(2): 144-152. WANG Lei, LI Deren, CHEN Ruizhi, et al. Low Earth orbiter (LEO) navigation augmentation:opportunities and challenges[J]. Strategic Study of CAE, 2020, 22(2): 144-152.
[6] ZHAO Qile, WANG Chen, GUO Jing, et al. Enhanced orbit determination for BeiDou satellites with FengYun-3C onboard GNSS data[J]. GPS Solutions, 2017, 21(3): 1179-1190.
[7] 杨宇飞, 杨元喜, 徐君毅, 等. 低轨卫星对导航卫星星座轨道测定的增强作用[J]. 武汉大学学报(信息科学版), 2020, 45(1): 46-52. YANG Yufei, YANG Yuanxi, XU Junyi, et al. Navigation satellites orbit determination with the enhancement of low earth orbit satellites[J]. Geomatics and Information Science of Wuhan University, 2020, 45(1): 46-52.
[8] 曾添, 隋立芬, 贾小林, 等. 风云3C增强北斗定轨试验结果与分析[J]. 测绘学报, 2017, 46(7): 824-833. DOI:10.11947/j.AGCS.2017.20170033. ZENG Tian, SUI Lifen, JIA Xiaolin, et al. Results and analysis of BDS precise orbit determination with the enhancement of FengYun-3C[J]. Acta Geodaetica et Cartographica Sinica, 2017, 46(7): 824-833. DOI:10.11947/j.AGCS.2017.20170033.
[9] ZHU S, REIGBER C, KÖNIG R.Integrated adjustment of CHAMP, GRACE, and GPS data[J]. Journal of Geodesy, 2004, 78(1): 103-108.
[10] MONTENBRUCK O, GILL E, KROES R. Rapid orbit determination of LEO satellites using IGS clock and ephemeris products[J]. GPS Solutions, 2005, 9(3): 226-235.
[11] 耿江辉, 施闯,赵齐乐, 等. 联合地面和星载数据精密确定GPS卫星轨道[J]. 武汉大学学报(信息科学版), 2007, 32(10): 906-909. GENG Jianghui, SHI Chuang, ZHAO Qile, et al. GPS precision orbit determination from combined ground and space borne data[J]. Geomatics and Information Science of Wuhan University, 2007, 32(10): 906-909.
[12] 李建成, 张守建, 邹贤才,等. GRACE卫星非差运动学厘米级定轨[J]. 科学通报, 2009, 54(16): 2355-2362. LI Jiancheng, ZHANG Shoujian, ZOU Xiancai, et al. Precise orbit determination for GRACE with zero-difference kinematic method[J]. Chinese Science Bulletin, 2009, 54(16): 2355-2362.
[13] 周乐韬. 连续运行参考站网络实时动态定位理论、算法和系统实现[D]. 成都: 西南交通大学, 2003. ZHOU Letao. Theory, algorithms and implementation of network real-time kinematic positioning based on continuously operating reference stations[D]. Chengdu: Southwest Jiaotong University, 2003.
[14] 邹璇, 唐卫明, 葛茂荣, 等. 基于非差观测的网络实时动态定位方法及其在连续运行基准站跨网服务中的应用[J]. 测绘学报, 2011, 40(S1): 1-5. ZOU Xuan, TANG Weiming, GE Maorong, et al. Method of network RTK based on undifferenced observations correction and its functional realization in cross-CORS service[J]. Acta Geodaetica et Cartographica Sinica, 2011, 40(S1): 1-5.
[15] 张绍成. 基于GPS/GLONASS集成的CORS网络大气建模与RTK算法实现[D]. 武汉: 武汉大学, 2010. ZHANG Shaocheng.The GPS/GLONASS integrated CORS network atmosphere modeling and RTK algorithm implementation[D]. Wuhan: Wuhan University, 2010.
[16] 郭靖, 赵齐乐, 李敏,等. 利用星载GPS观测数据确定海洋2A卫星厘米级精密轨道[J]. 武汉大学学报(信息科学版), 2013, 38(1): 52-55. GUO Jing, ZHAO Qile, LI Min, et al. Centimeter level orbit determination for HY2A using GPS data[J]. Geomatics and Information Science of Wuhan University, 2013, 38(1): 52-55.
[17] HAINES B, BAR-SEVER Y, BERTIGER W,et al. One-centimeter orbit determination for Jason-1: new GPS-based strategies[J]. Marine Geodesy, 2004, 27(1-2): 299-318.
[18] JÄGGI A, DAHLE C, ARNOLD D,et al. Swarm kinematic orbits and gravity fields from 18 months of GPS data[J]. Advances in Space Research, 2016, 57(1): 218-233.
[19] 袁俊军, 赵春梅, 吴琼宝.资源三号01星及02星星载GPS天线PCO、PCV在轨估计及对精密定轨的影响[J]. 测绘学报, 2018, 47(5): 672-682. DOI: 10.11947/j.AGCS.2018.20170703. YUAN Junjun, ZHAO Chunmei, WU Qiongbao. Phase center offset and phase center variation estimation in-flight for ZY-3 01 and ZY-3 02 spaceborne GPS antennas and the influence on precision orbit determination[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(5): 672-682. DOI: 10.11947/j.AGCS.2018.20170703.
[20] 刘经南, 赵齐乐, 张小红. CHAMP卫星的纯几何定轨及动力平滑中的动力模型补偿研究[J]. 武汉大学学报(信息科学版), 2004, 29(1): 1-6. LIU Jingnan, ZHAO Qile, ZHANG Xiaohong. Geometric orbit determination of CHAMP satellite and dynamic models’ compensation during orbit smoothing[J]. Geomatics and Information Science of Wuhan University, 2004, 29(1): 1-6.
[21] 秦显平, 杨元喜. 平方根滤波/平滑/双向滤波在LEO星载GPS定轨中的应用[J]. 武汉大学学报(信息科学版), 2009, 34(10): 1176-1180. QIN Xianping, YANG Yuanxi. Application of square root filtering/smoothing/bidirectional filtering on GPS-based orbit determination for LEO[J]. Geomatics and Information Science of Wuhan University, 2009, 34(10): 1176-1180.
[22] 许龙霞. 基于共视原理的卫星授时方法[D]. 西安: 中国科学院大学, 2012. XU Longxia. A new common-view based timing method[D]. Xi’an: University of Chinese Academy of Sciences, 2012.
[23] FU Wenju, HUANG Guanwen, ZHANG Qin, et al. Multi-GNSS real-time clock estimation using sequential least square adjustment with online quality control[J]. Journal of Geodesy, 2019, 93(7): 963-976.
[24] 王甫红, 夏博洋, 龚学文. 顾及钟差变化率的GPS卫星钟差预报法[J]. 测绘学报, 2016, 45(12): 1387-1395. DOI: 10.11947/j.AGCS.2016.20150480. WANG Fuhong, XIA Boyang, GONG Xuewen. A GPS satellite clock offset prediction method based on fitting clock offset rates data[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(12): 1387-1395. DOI: 10.11947/j.AGCS.2016.20150480.
[25] WANG Lei, XU Beizhen, FU Wenju, et al. Centimeter-level precise orbit determination for the Luojia-1A satellite using BeiDou observations[J]. Remote Sensing, 2020, 12(12): 2063.
[26] 张睿. BDS精密定轨关键技术研究[D]. 西安: 长安大学, 2016. ZHANG Rui.Research on key technologies of BDS precise orbit determination[D]. Xi’an: Chang’an University, 2016.