X-ray pulsar-based navigation system with the errors in the planetary ephemerides for Earth-orbiting satellite |
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| Authors: | Yidi Wang Wei Zheng Shouming Sun Li Li |
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| Institution: | 1. College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2. The State Key Laboratory of Astronautic Dynamics, Xi’an Satellite Control Center, Xi’an 710043, China;3. Science and Technology on Aerospace Flight Dynamics Laboratory, Beijing 100094, China |
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| Abstract: | The objective of this paper is to investigate and reduce the impact of the errors in the planetary ephemerides on X-ray pulsar-based navigation system for Earth-orbiting satellite. Expressions of the system biases caused by the errors in the planetary ephemerides are derived. The result of investigation has shown that the impact of the error in Earth’s ephemeris is must greater than the errors in the other ephemerides and would greatly degrade the performance of X-ray pulsar-based navigation system. Moreover, the system bias is modeled as a slowly time-varying process, and is handled by including it as a part of navigation state vector. It has been demonstrated that the proposed navigation system is completely observable, and some simulations are performed to verify its feasibility. |
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| Keywords: | X-ray pulsar-based navigation Planetary ephemerides Navigation error |
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