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Area of Science:

  • Geodesy and Geomatics
  • Satellite Navigation Systems
  • Computational Science

Background:

  • High-rate clock corrections are essential for precise satellite positioning.
  • Current methods face computational challenges with increasing data and multi-GNSS integration.
  • Existing epoch-differenced methods complicate absolute clock alignment.

Purpose of the Study:

  • To develop an efficient high-rate clock estimation method for GNSS satellites.
  • To reduce the computational burden in Precise Point Positioning (PPP).
  • To enable reliable multi-GNSS positioning services.

Main Methods:

  • Proposed an efficient "carrier-range" method using PPP with integer ambiguity resolution.
  • Developed processing procedures for both post-processing and real-time applications.
  • Utilized epoch-differenced observations to eliminate ambiguities.

Main Results:

  • Reduced computation time to approximately one-sixth of existing methods for post-processing.
  • Achieved real-time processing of a single epoch in under 1 second for a 200-station network.
  • Demonstrated the feasibility of high-rate clock estimation for multi-GNSS networks.

Conclusions:

  • The proposed "carrier-range" method significantly enhances computational efficiency for GNSS clock estimation.
  • This strategy supports high-rate clock estimation for future multi-GNSS networks.
  • The method is viable for both post-processing and potentially real-time applications.