激光星间链路终端指向误差标定中的误差分离研究
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摘要
针对激光星间链路终端指向误差在轨标定中航天器姿态测量误差影响标定结果的问题,本文提出了基于多链路测量的航天器姿态测量误差分离方法。该方法利用了导航星座中同一航天器同时建立多条链路的特点,获取不同方向的LCT指向误差测量数据。通过同时估计航天器姿态测量误差与LCT自身指向误差参数,实现了航天器姿态测量误差与LCT自身指向误差的分离。仿真结果表明:航天器姿态测量误差对LCT指向误差标定结果有显著影响,利用本方法进行误差分离后,LCT指向误差标定结果最大偏差由分离前的64. 9μrad下降到误差分离(6条链路)后的21. 1μrad,有效降低了航天器姿态测量误差对LCT指向误差标定结果的影响。该方法的有效性取决于链路条数和链路拓扑构型。
The in-orbit calibration accuracy of the LCT pointing error is corrupted by the spacecraft 's attitude measurement errors. A method using measurements from multiple inter-satellite links to the separation of the spacecraft's attitude measurement errors is proposed. The measurement data of the LCT pointing errors are acquired from multiple directions corresponding to the inter-satellite links established in navigation constellation. The spacecraft 's attitude measurement errors and LCT pointing error parameters are estimated simultaneously utilizing those measurements. The simulation results show that the calibration accuracy of the LCT pointing error is severely affected by the spacecraft's attitude measurement errors. While applying parameters estimation with this method,the maximal error of the resulting estimated pointing error parameters is reduced from 64. 9 μrad to 21. 1 μrad( with 6 links),demonstrating the validity of this error separation method. It also shows the accuracy of this method is dominated by the number and the topology of the inter-satellite links observed.
The in-orbit calibration accuracy of the LCT pointing error is corrupted by the spacecraft 's attitude measurement errors. A method using measurements from multiple inter-satellite links to the separation of the spacecraft's attitude measurement errors is proposed. The measurement data of the LCT pointing errors are acquired from multiple directions corresponding to the inter-satellite links established in navigation constellation. The spacecraft 's attitude measurement errors and LCT pointing error parameters are estimated simultaneously utilizing those measurements. The simulation results show that the calibration accuracy of the LCT pointing error is severely affected by the spacecraft's attitude measurement errors. While applying parameters estimation with this method,the maximal error of the resulting estimated pointing error parameters is reduced from 64. 9 μrad to 21. 1 μrad( with 6 links),demonstrating the validity of this error separation method. It also shows the accuracy of this method is dominated by the number and the topology of the inter-satellite links observed.
引文
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[2]于思源.卫星光通信瞄准捕获跟踪技术[M].北京:科学出版社,2016:288-297.
[3]林益明,程竟爽,何善宝,等.激光星间链路快速捕获技术综述[J].航天器工程,2018,27(1):102-109.[Lin Yi-ming,Cheng Jing-shuang, He Shan-bao, et al. Review on fast acquisition techniques of inter-satellite laser links[J]. Spacecraft Engineering,2018,27(1):102-109.]
[4] Pittelkau M E. Autonomous on-board calibration of Attitude Sensors and Gyros[C]. The 20th International Symposium on Space Flight Dynamics,Annapolis,Maryland,September 24-28,2007.
[5] Nielsen T T,Oppenhaeuser G. In orbit test result of an operational optical intersatellite link between ARTEMIS and SPOT4,SILEX[C]. SPIE Free-Space Laser Communication TechnologiesⅪⅤ,San Jose,California,USA,January 20-25,2002.
[6] Takashi J,Yoshihisa T,Nobuhiro K,et al. OICETS on-orbit laser communication experiments[C]. SPIE Free-Space Laser Communication TechnologiesⅩⅤⅢ,2006,6105:610505-1-610503-11.
[7]武凤,于思源,马仲甜,等.星地激光通信链路瞄准角度偏差修正及在轨验证[J].中国激光,2014,6(1):154-159.[Wu Feng,Yu Si-yuan,Ma Zhong-tian,et al. Correction of pointing angle deviation and in-orbit validation in satellite-ground laser communication links[J]. Chinese Journal of Lasers,2014,6(1):154-159.]
[8] Yu S Y,Wu F,Tan L Y,et al. Static position errors correction on the satellite optical communication terminal[J]. Optical Engineering,2017,56(2):026112.
[9] Jono T,Takayama Y,Koyama Y,et al. In-orbit test results of the inter satellite laser link by OICETS[C]. The 25th AIAA International Communications Satellite Systems Conference,Seoul,South Korea,April 10-13,2007.
[10] Fields R,Lunde C,Wong R,et al. NFIRE-to-Terra SAR-X laser communication results:satellite pointing,disturbances,and other attributes consistent with successful performance[C]. SPIE Sensors and Systems for Space ApplicationsⅢ,Orlando,Florida,USA,April 13-17,2009.
[11] Burnside J,Conrad S,Pillsbury A,et. al. Design of an inertially stabilized telescope for the LLCD[C]. SPIE Free-Space Laser Communication TechnologiesⅩⅩⅢ,San Jose,California,USA,January 22-27,2011.
[12]程竟爽,林益明,何善宝,王海红.一种改进的激光星间链路终端指向误差在轨标定方法[J].宇航学报,2018,39(1):67-75.[Cheng Jing-shuang,Lin Yi-ming,He Shan-bao,Wang Hai-hong. An improved in orbit pointing error calibration method of laser communications terminal[J]. Journal of Astronautics,2018,39(1):67-75.]
[13] Psiaki M L. Estimation of a spacecraft's attitude dynamics parameters by using flight data[J]. Journal of Guidance,Control and Dynamics,2005,28(4):594-603.
[14] Springmann J C,Cutler J W. Attitude-independent magnetometer calibration with time-varying bias[J]. Journal of Guidance,Control and Dynamics,2012,35(4):1080-1088.
[15] Springmann J C,Cutler J W. On-orbit calibration of photodiodes for attitude determination[J]. Journal of Guidance,Control and Dynamics,2014,37(6):1808-1823.
[16] Lee Y J,Yilmaz A. Boresight calibration of the aerial multi-head camera system[C]. SPIE Evolutionary and Bio-Inspired Computation:Theory and Applications V,San Jose,California,USA,May 11,2011.
[17]北斗卫星导航系统空间信号接口控制文件公开服务信号B1C(1. 0版)[R].中国卫星导航系统管理办公室,2017年12月.
[18]张忠山,谢平,闫俊刚,等.双层规划求解兼顾测量与通信的星间链路设计[J].宇航学报,2016,37(5):576-585.[Zhang Zhong-shan,Xie Ping,Yan Jun-gang,et al. Bilevel programming for solving the inter-satellite link designing problem while giving consideration to both ranging and communication[J]. Journal of Astronautics,2016,37(5):576-585.]