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A Differential Measurement Method for Solving the Ephemeris Observability Issues in Autonomous Navigation

Published online by Cambridge University Press:  25 May 2015

Shilong Liao*
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030) (University of Chinese Academy of Sciences, Beijing 100049, China)
Zhaoxiang Qi
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030)
Zhenghong Tang
Affiliation:
(Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030)

Abstract

The autonomous navigation of navigation and positioning systems such as the Global Positioning System (GPS) and other Global Navigation Satellite Systems (GNSS) was motivated to improve accuracy and survivability of the navigation function for 180 days without ground contact. These improvements are accomplished by establishing inter-satellite links in the constellation for pseudo-range observations and communications between satellites. But observability issues arise for both ephemeris and clock since the pseudo-range describes only the relative distance between satellites. A differential measurement method is proposed to measure the rotation of the constellation as a whole for the first time. The feasibility of the proposed method is verified by simulations.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 2015 

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