| X射线脉冲星导航中钟差的可观测性问题 |
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| 引用本文： | 陈拯民,黄显林,卢鸿谦. X射线脉冲星导航中钟差的可观测性问题[J]. 宇航学报, 2011, 32(6). DOI: 10.3873/j.issn.1000-1328.2011.06.009 |
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| 作者姓名： | 陈拯民 黄显林 卢鸿谦 |
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| 作者单位： | 哈尔滨工业大学控制理论与制导技术研究中心,哈尔滨,150001 |
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| 摘 要： | 标准X射线脉冲星导航(XNAV)能够求解航天器的位置信息,但航天器钟差会导致XNAV的结果产生误差.鉴于脉冲星周期的稳定性,在利用XNAV进行轨道估计中,将钟差作为状态变量进行估计的授时方案已被相关学者提出.一种针对卫星轨道修正专门设计的可观测性分析工具在文中给出,利用其能够有效地判断各个状态的可观测性情况.利用该方法分析将钟差作为状态变量的导航方案,其结果表明仅需2颗脉冲星就可以对全部轨道六根数,以及卫星钟差进行观测;仿真结果验证了可观测性分析结论,双脉冲星导航时系统可以达到60m的定位精度和60ns的授时精度.对比仿真同时揭示了该方案能够有效地抑制钟差对导航精度的影响,将由于钟差引起的定位误差减小20倍以上.理论分析与仿真表明,将钟差作为状态变量的导航方案是一种能够有效地估计钟差,并抑制钟差影响、提升系统估计精度的导航方案.
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| 关 键 词： | 脉冲星 钟差 可观测性 卫星 卡尔曼滤波 |
The Observability of Clock Error in Orbit Determination Using X-Ray Pulsar Based Navigation |
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| CHEN Zheng-min,HUANG Xian-lin,LU Hong-qian. The Observability of Clock Error in Orbit Determination Using X-Ray Pulsar Based Navigation[J]. Journal of Astronautics, 2011, 32(6). DOI: 10.3873/j.issn.1000-1328.2011.06.009 |
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| Authors: | CHEN Zheng-min HUANG Xian-lin LU Hong-qian |
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| Affiliation: | CHEN Zheng-min,HUANG Xian-lin,LU Hong-qian(Control Theory and Guidance Research Center,Harbin Institute of Technology,Harbin 150001,China) |
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| Abstract: | Standard X-ray pulsar based navigation(XNAV) can provide spacecrafts with autonomous positioning services,but the clock error of spacecraft will cause an approximate static measurement error in XNAV.In the light of the stability of pulsar's period,a new clock error estimation method taking the clock error as an extended state in orbit determination using XNAV is proposed by fellow researchers.An observability analysis tool specifically designed for the obit determination is given.The observability analysis ... |
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| Keywords: | Pulsar Clock error Observability Satellite Kalman filter |
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