An assessment of smartphone and low-cost multi-GNSS single-frequency RTK positioning for low, medium and high ionospheric disturbance periods

Robert Odolinski, Peter J.G. Teunissen

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)
82 Downloads (Pure)

Abstract

The emerging GNSSs make single-frequency (SF) RTK positioning possible. In this contribution two different types of low-cost (few hundred USDs) RTK receivers are analyzed, which can track L1 GPS, B1 BDS, E1 Galileo and L1 QZSS, or any combinations thereof, for a location in Dunedin, New Zealand. These SF RTK receivers can potentially give competitive ambiguity resolution and positioning performance to that of more expensive (thousands USDs) dual-frequency (DF) GPS receivers. A smartphone implementation of one of these SF receiver types is also evaluated. The least-squares variance component estimation (LS-VCE) procedure is first used to formulate a realistic stochastic model, which assures that our receivers at hand can achieve the best possible ambiguity resolution and RTK positioning performance. The best performing low-cost SF RTK receiver types are then assessed against DF GPS receivers and survey-grade antennas. Real data with ionospheric disturbances at low, medium and high levels are analyzed, while making use of the ionosphere-weighted model. It will be demonstrated that when the presence of the residual ionospheric delays increases, instantaneous RTK positioning is not possible for any of the receivers, and a multi-epoch model is necessary to use. It is finally shown that the low-cost SF RTK performance can remain competitive to that of more expensive DF GPS receivers even when the ionospheric disturbance level reaches a Kp-index of 7−, i.e. for a strong geomagnetic storm, for the baseline at hand.

Original languageEnglish
Pages (from-to)701–722
Number of pages22
JournalJournal of Geodesy
Volume93 (2019)
DOIs
Publication statusPublished - 28 Aug 2018

Keywords

  • B1 BDS
  • E1 Galileo
  • Ionosphere-weighted models
  • Kp-index
  • L1 GPS
  • L1 QZSS
  • Low-cost RTK receiver
  • Multi-GNSS
  • Smartphone RTK

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