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1 results

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

  • Shilong Liao, Zhaoxiang Qi, Zhenghong Tang
  • Journal:
    The Journal of Navigation / Volume 68 / Issue 6 / November 2015
    Published online by Cambridge University Press:
    25 May 2015, pp. 1133-1140
    Print publication:
    November 2015

  • 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.