A Differential Measurement Method for Solving the Ephemeris Observability Issues in Autonomous Navigation. (November 2015)

• Record Type: Journal Article
• Authors: Liao, Shilong; Qi, Zhaoxiang; Tang, Zhenghong
• Is Part Of: Journal of navigation. Volume 68:Number 6(2015)
• Page Start: 1133
• Page End: 1140
• Publication Date: 2015-11
• Subjects: Navigation -- Periodicals; 623.8905
• DOI: 10.1017/S0373463315000417
• Languages: English
• ISSNs: 0373-4633

Abstract

<abstract abstract-type="normal"> <title> <x content-type="archive" xml:space="preserve">Abstract</x> </title> <p>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.</p> </abstract>