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Fast Phase-Only Positioning with Triple-Frequency GPS.

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Summary
This summary is machine-generated.

Fast, precise positioning using Global Positioning System (GPS) phase-only data is achievable with minimal changes in satellite geometry. This study explores two-epoch processing for single, dual, and triple-frequency GPS, demonstrating its effectiveness even with short time spans.

Keywords:
Ambiguity Dilution of Precision (ADOP)GPSambiguity resolutionphase-onlysuccess-rate

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Geodesy

Background:

  • Traditional Global Positioning System (GPS) ambiguity resolution relies on both phase and code measurements, necessitating benign multipath environments.
  • Phase-only processing mitigates multipath effects but typically requires significant changes in receiver-satellite geometry, precluding instantaneous resolution.

Purpose of the Study:

  • To investigate the feasibility of rapid phase-only ambiguity resolution and assess the positioning performance of GPS for short baselines.
  • To determine the necessary changes in relative receiver-satellite geometry for successful phase-only ambiguity resolution and high-precision baseline solutions.

Main Methods:

  • Analysis of two-epoch phase-only performance for single-, dual-, and triple-frequency GPS over time spans from 60 seconds down to 1 second.
  • Empirical and formal demonstrations of phase-only ambiguity resolution and positioning accuracy.
  • Formal analyses conducted over a large geographical area including Australia, parts of Asia, the Indian Ocean, and the Pacific Ocean.

Main Results:

  • Demonstrated that fast, phase-only Global Positioning System (GPS) positioning with high precision is achievable.
  • Identified the specific circumstances enabling successful and rapid phase-only ambiguity resolution.
  • Validated the performance across various GPS frequencies and short time intervals.

Conclusions:

  • Phase-only processing offers a viable alternative for precise GPS positioning, especially in environments where code measurements are unreliable due to multipath.
  • The study confirms that minimal changes in receiver-satellite geometry are sufficient for effective two-epoch phase-only ambiguity resolution.
  • Fast, precise positioning using GPS phase-only data is attainable, expanding the applicability of high-accuracy GNSS techniques.