Fast Phase-Only Positioning with Triple-Frequency GPS

Kan Wang, Pei Chen, Peter J.G. Teunissen

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)
32 Downloads (Pure)


In this contribution, we study the phase-only ambiguity resolution and positioning performance of GPS for short baselines. It is well known that instantaneous (single-epoch) ambiguity resolution is possible when both phase and code (pseudorange) data are used. This requires, however, a benign multipath environment due to the severe effects multipath has on the code measurements. With phase-only processing, one would be free from such severe effects, be it that phase-only processing requires a change in receiver-satellite geometry, as a consequence of which it cannot be done instantaneously. It is thus of interest to know how much change in the relative receiver-satellite geometry is needed to achieve successful phase-only ambiguity resolution with correspondingly high precision baseline solutions. In this contribution, we study the two-epoch phase-only performance of single-, dual-, and triple-frequency GPS for varying time spans from 60 s down to 1 s. We demonstrate, empirically as well as formally, that fast phase-only very-precise positioning is indeed possible, and we explain the circumstances that make this possible. The formal analyses are also performed for a large area including Australia, a part of Asia, the Indian Ocean, and the Pacific Ocean. We remark that in this contribution "phase-only" refers to phase-only measurements in the observation model, while the code data are thus only used to compute the approximate values needed for linearizing the observation equations.

Original languageEnglish
Number of pages18
JournalSensors (Basel, Switzerland)
Issue number11
Publication statusPublished - 2018


  • Ambiguity Dilution of Precision (ADOP)
  • ambiguity resolution
  • GPS
  • phase-only
  • success-rate

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