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A New Asynchronous RTK Method to Mitigate Base Station Observation Outages.

Yuan Du1,2, Guanwen Huang3, Qin Zhang1

  • 1College of Geomatics, Xi'an University of Science and Technology, Xi'an 710054, China.

Sensors (Basel, Switzerland)
|August 4, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a new asynchronous Real-Time Kinematic (RTK) positioning method to maintain centimeter-level accuracy during Global Navigation Satellite Systems (GNSS) observation gaps. The technique extends accuracy to 15 minutes, overcoming limitations of previous methods.

Keywords:
ARTKGNSS RTKasynchronous errorsbase stationobservation outages

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Geodetic Surveying

Background:

  • Real-Time Kinematic (RTK) positioning enhances Global Navigation Satellite Systems (GNSS) precision by reducing errors.
  • Current RTK methods struggle with base station data interruptions, rapidly degrading rover positioning accuracy.
  • Existing strategies maintain centimeter-level accuracy for only up to three minutes during data gaps.

Purpose of the Study:

  • To propose a novel asynchronous RTK method capable of bridging significant gaps in base station observations.
  • To enhance the robustness and reliability of RTK positioning during intermittent data availability.
  • To extend the duration of centimeter-level positioning accuracy in challenging GNSS environments.

Main Methods:

  • Elimination of satellite clock and orbital errors using precise ephemeris products.
  • Correction of tropospheric error via the Saastamoinen model.
  • Correction of asynchronous ionospheric delay using rover receiver carrier phase measurements.
  • Prediction of residual asynchronous error using a first-degree polynomial function.

Main Results:

  • The proposed asynchronous RTK method achieves centimeter-level accuracy for up to 15 minutes during base station observation interruptions.
  • The method demonstrates effectiveness in both real-time and post-processing scenarios.
  • Real-time accuracy is maintained for 15 minutes even with projected large systematic errors in the U direction.

Conclusions:

  • The novel asynchronous RTK method significantly improves positioning accuracy during GNSS data gaps.
  • This approach extends the reliable operational time of centimeter-level RTK positioning.
  • The method offers a robust solution for maintaining high-accuracy positioning in real-time and post-processing applications with intermittent data.