Whole Link Time Calibration of Mars Orbiter and Launch Day Timing
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摘要:根据火星环绕器的设计特点及器上配置,针对环绕器全链路时间标定进行了研究与验证,分析了环绕器器地时间传输路径,给出了适用于火星探测任务的环绕器全链路时间标定方法,介绍了用于时间标定的硬件设备、软件设计和系统组成。实际应用效果表明:火星环绕器全链路时间标定方法合理,发射日当天授时准确,地面测试数据得到了在轨运行的实际证实。对后续火星探测以及相关深空型号任务的探测器时间标定系统设计和标定方法具有良好的参考价值。Abstract:According to design characteristics and configuration of Mars orbiter, the whole link time calibration of mars orbiter was studied and validated, the time transmission path of Mars orbiter was analyzed, and a whole link time calibration method suitable for Mars exploration missions was given. Time calibration of hardware equipment, software design and system configuration was introduced. The actual application results show that the calibration method of the whole link time of Mars orbiter was reasonable, the launch day timing was accurate, and the ground test data were verified by the actual operation in orbit. This paper provides important reference for the design of time calibration system and calibration method for subsequent Mars exploration and related deep space missions.
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Key words:
- Mars/
- orbiter/
- deep space exploration/
- time calibration
Highlights● Analyse the whole link time transfer path of Mars orbiter. ● A whole link time calibration method applicable to Mars missions. ● Hardware and software design for time calibration system. ● Mars orbiter ground timing method of launch day. -
表 1时间稳定度标定记录表
Table 1Calibration results of time stability
阶段 振荡值
σ/ms斜率/
m精度/
ms结论 加电初始状态 0.35 0.1 加电初期晶振稳定后,时间漂移恒定 均匀校时后 2 < 0.01 0.1 时间漂移扣除后,时间差值拟合后趋于恒定 表 2器上时间补偿值标定表
Table 2Time compensation value on Mars orbiter
码速率
r/(bit.s–1)编码后
帧长
f/ByteFPGA
周期数
Nf遥测帧头
解调时间
Tf/ms器上
时延
Tq
/ms实际时差
测量值
Tt/ms器上时间
补偿值
Tb/ms8 512 4 100 4 000 8 937.189 5 124.213 1 029 441 32 512 4 100 1 000 2 234.039 1 280.653 257 363 1 024 512 4 099 31.25 69.477 2 39.754 33 8 045.157 16 384 512 4 095 1.953 125 4.452 777 2.232 33 506.438 6 表 3发射日授时及在轨复核表
Table 3Launch day timing results
阶段 修正值/ms 器地时差/ms 均匀校时 精度/ms 结论 发射日当天授时 31 < 0.1 关 0.1 发射前9 h,使用综合测试系统完成授时,扣除地面误差后完成器地时统 入轨后3天时间复核 43 < 0.1 关 0.1 入轨后,使用地面测站系统,根据器地时延补偿估算,进行时间复核与修正。实测值表明,在均匀校时不启动的情况下,器上时间误差及趋势与地面标定一致。 -
[1] 耿言,周继时,李莎,等. 我国首次火星探测任务[J]. 深空探测学报(中英文),2018,5(5):399-405.GENG Y,ZHOU J S,LI S,et al. Review of first Mars exploration mission in China[J]. Journal of Deep Space Exploration,2018,5(5):399-405. [2] 刘建军,苏彦,左维,等. 中国首次火星探测任务地面应用系统[J]. 深空探测学报(中英文),2018,5(5):414-425.LIU J J,SU Y,ZUO W,et al. Ground research and application system of China's first Mars exploration mission[J]. Journal of Deep Space Exploration,2018,5(5):414-425. [3] 黄承强,杨旭梅,陈亮. 卫星双向时间比对的设备时延标定方法[J]. 飞行器测控学报,2015,34(3):297-279.HUANG C Q,YANG X H,CHEN L. A calibration method of equipment time delay based on two-way satellite time comparison[J]. Journal of Spacecraft TT& C Technology,2015,34(3):297-279. [4] 杨同智,盛开明. 卫星星地时差测量监控方法研究[J]. 遥测遥控,2018(1):17-23.doi:10.3969/j.issn.2095-1000.2018.01.004YANG T Z,SHENG K M. Research on Time difference measurement method between satellite clock and ground clock[J]. Journal of Telemetry,Tracking and Command,2018(1):17-23.doi:10.3969/j.issn.2095-1000.2018.01.004 [5] 撒文彬,李勤毅,王松,等. 一种卫星地面测试中高精度星地时差测量方法[J]. 兵器装备工程学报,2016(11):70-73.doi:10.11809/scbgxb2016.11.016SA W B,LI Q Y,WANG S,et al. High precision satellite ground time difference measuring method in satellite ground test[J]. Journal of Ordnance Equipment Engineering,2016(11):70-73.doi:10.11809/scbgxb2016.11.016 [6] 杨天社,李怀祖. 在轨卫星与地面时钟精确同步方法研究[J]. 系统工程与电子技术,2002,24(5):1-3.doi:10.3321/j.issn:1001-506X.2002.05.001YANG T S,LI H Z. On the methods to keep satellite/ground clocks synchronous accurately[J]. Systems Engineering and Electronics,2002,24(5):1-3.doi:10.3321/j.issn:1001-506X.2002.05.001 [7] 孙杰,潘继飞. 高精度时间间隔测量方法综述[J]. 计算机测量与控制,2007,15(2):1-4.doi:10.16526/j.cnki.11-4762/tp.2007.02.002SUN J,PAN J F. Methods of high precision time-interval measurement[J]. Computer Measurement & Control,2007,15(2):1-4.doi:10.16526/j.cnki.11-4762/tp.2007.02.002 [8] 刘一栋,屈战涛. 高精度星间时差测量探讨[J]. 载人航天,2012,18(1):1-3.doi:10.3969/j.issn.1674-5825.2012.01.001LIU Y D,QU Z T. Study on high accuracy satellites time difference measurement[J]. Manned Spaceflight,2012,18(1):1-3.doi:10.3969/j.issn.1674-5825.2012.01.001 [9] 许龙霞. 基于共视原理的卫星授时方法[D]. 北京: 中国科学院大学, 2012.XU L X. A new common-view based timing method [D]. Beijing: University of Chinese Academy Sciences, 2012. [10] 江志恒. GPS全视法时间传递回顾与展望[J]. 宇航计测技术, 2007(增刊1): 53-71.JIANG ZH H. Review and perspective of GPS all in view time transfer [J]. Journal of Astronautic Metrology and Measurement, 2007(Zl. 1): 53-71.
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