Autonomous Time-tag Error Measurement Applying Two Way Time Transfer for Earth Gravity Satellites
-
摘要: 星间时标误差的自主测量对于中国自主研发地球重力卫星具有重要意义. 提出利用双向时间传递法实现重力卫星时标误差的自主测量, 设计了测量方案, 建立了包含卫星运动导致的链路非对称、电离层效应、设备零值以及随机测时误差在内的测量模型. 结合地球重力卫星相关特性, 分析了时标误差测量中各误差源的影响及相应的误差校正方法. 以GRACE重力卫星为例, 利用提出的方法和校正措施, 星间时标误差自主测量精度可以达到0.62ns, 其中误差主要来自系统零值标定误差和随机测时误差.Abstract: Autonomous time-tag error measurement is of importance for development of Chinese Earth gravity satellites. In this paper, Two Way Time Transfer (TWTT) method is introduced for the autonomous time-tag error measurement of gravity satellites. A measurement scenario is presented, and a model which includes satellite-motion-induced path asymmetry, ionosphere effect, instrument delay, and random time measurement error is built. Combining the characteristics of Earth gravity satellites adopting TWTT, the influences of above mentioned error sources are analyzed and the relevant correction methods are proposed. Take GRACE (Gravity Recovery And Climate Experiment) system for example, based on the TWTT method with correction means, the achieved measurement precision of autonomous time-tag error can be better than 0.62ns, most of which is induced by the calibration error of instrument delay and the random time measurement error.
-
[1] Wolff M. Direct measurements of the Earth's gravitational potential using a satellite pair[J]. J. Geophys. Res., 1969, 22:5295-5300 [2] Dunn C, Bertiger W, Franklin G, et al. The instrument on NASA's GRACE mission: augmentation of GPS to achieve unprecedented gravity field measurements[C]//Proceeding of the 15th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GPS 2002). Portland: Institute of Navigation, 2002 [3] Kim J, Lee S W. Flight performance analysis of GRACE K-band ranging instrument[J]. Acta Astron., 2009, 65:1571-1581 [4] Kim J, Lee Y J. Measurement interpolation methods for dual one-way ranging systems[J]. J. Spacecr. Rocket., 2009, 3:707-712 [5] Enzer D G, Wang R T, Klipstein W M. GRAIL: a microwave ranging instrument to map out the lunar gravity field[C]//Frequency Control Symposium, 2010 IEEE International. Newport Beach: Institute of Electrical and Electronics Engineers, 2010. 572-577 [6] Steele J, Markowitz W, Lidback A. Telstar time synchronization[J]. IEEE Trans. Instr. Meas., 1964, 4:164-170 [7] Xu Yong, Chang Qing, Yu Zhijian. On new measurement and communication techniques of GNSS inter-satellite links[J]. Sci. China: Tech. Sci., 2012, 55:285-294 [8] Cao Hui, Xiong Zhi, Yu Feng. Autonomous constellation positioning and timing by dual-frequency inter-satellite measurement[J]. J. Appl. Sci., 2009, 27(2):216-220. In Chinese (曹辉, 熊智, 郁丰. 星座双频测距测速自主定位与守时[J]. 应用科学学报, 2009, 27(2):216-220) [9] Huang Feijiang, Lu Xiaochun, Wu Haitao, et al. An algorithm of dynamic two-way time transfer based on intersatellite range variation[J]. Geomat. Inf. Sci. Wuhan Univ., 2010, 35(1):13-16. In Chinese (黄飞江, 卢晓春, 吴海涛, 等. 基于星 间距离变化的动态双向时间同步算法[J]. 武汉大学学报: 信息科学版, 2010, 35(1):13-16) [10] Sun Wenchao, Chang Qing, Xu Yong, Qi Wei. Analysis and correction on relativistic effect of inter-satellites using dual one-way ranging/time synchronization[J]. J. Beijing Univ. Aeron. Astron., 2012, 38(3):335-339. In Chinese (孙文超, 常青, 徐勇, 齐巍. 星间DOWRT中的相对论效应分析与修正[J]. 北京航 空航天大学学报, 2012, 38(3):335-339) [11] Bertiger W, Bar-Sever Y, Desai S, et al. GRACE: millimeters and microns in orbit[C]//Proceedings of ION GPS. Manassas: Institute of Navigation, 2002. 2022-2029 [12] Han Yong, Li Qingbo. Measurement error and correction of the ionospheric effect[J]. Chin. J. Space Sci., 2012, 32(1):55-59. In Chinese (韩勇, 李庆波. 电离层效应的 测时误差及其修正[J]. 空间科学学报, 2012, 32(1):55-59) [13] Bilitza D, Reinisch B W. International reference ionosphere 2007: improvements and new parameters[J]. Adv. Space Res., 2008, 42:599-609 [14] Lee C K, Han S C, Bilitza D, Chung J K. Validation of international reference ionosphere models using in situ measurements from GRACE K-band ranging system and CHAMP planar Langmuir probe[J]. J. Geodesy, 2011, 85:921-929 [15] Merck P, Achkar J. Design of a Ku band delay difference calibration device for TWSTFT[J]. IEEE Trans. Instr. Meas., 2005, 54(2):814-818 [16] Zhong Xingwang, Chen Hao. The system and its delay calibration method on inter-satellite dual one-way ranging and timing[J]. J. Elect. Meas. Instr., 2009, 23(4):13-17. In Chinese (钟兴旺, 陈豪. 双向单程距离与时差测量系统及零值标定 方法[J]. 电子测量与仪器学报, 2009, 23(4):13-17) [17] Parker T E, Zhang V. Sources of instabilities in two-way satellite time transfer[C]//Frequency Control Symposium and Exposition, Proceeding of the 2005 IEEE International. Vancouver: Institute of Electrical and Electronics Engineers, 2005.745-751 [18] Gotoh T, Amagai J, Hobiger T, et al. Development of a GPU-based two-way time transfer modem[J]. IEEE Trans. Instr. Meas., 2011, 60(7):2495-2499 [19] She Shigang. Research on the Technology of High-precision K-band Inter-satellite Microwave Ranging[D]. Lanzhou: Lanzhou University, 2008. In Chinese (佘世刚. 高精度K频段星间微波测距技术研究[D]. 兰州: 兰州大学, 2008)
点击查看大图
计量
- 文章访问数: 2314
- HTML全文浏览量: 60
- PDF下载量: 865
- 被引次数: 0