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GNSS Precise Relative Positioning Using A Priori Relative Position in a GNSS Harsh Environment.

Euiho Kim1

  • 1Department of Mechanical & System Design Engineering, Hongik University, 94, Wausan-ro, Mapo-Gu, Seoul 04066, Korea.

Sensors (Basel, Switzerland)
|March 6, 2021
PubMed
Summary
This summary is machine-generated.

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This study presents a new method for Global Navigation Satellite System (GNSS) precise relative positioning. It achieves reliable centimeter-level accuracy quickly, even with few satellites, outperforming traditional real-time kinematic (RTK) systems.

Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Geodetic Surveying

Background:

  • Real-time kinematic (RTK) systems are crucial for Global Navigation Satellite System (GNSS) precise relative positioning.
  • RTK systems face challenges with incorrect integer ambiguity fixing and long initialization times, especially with limited satellite visibility.

Purpose of the Study:

  • To develop a novel GNSS carrier phase-based precise relative positioning method.
  • To enable reliable and rapid integer ambiguity fixing, even in GNSS-challenging environments with few visible satellites.

Main Methods:

  • Introduced a method utilizing a fixed baseline length and initial heading measurements.
  • Developed an iterative integer rounding scheme for sequential ambiguity resolution based on satellite geometry and averaging epochs.
Keywords:
GNSSrelative positionvehicle formation

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  • Analyzed required averaging epochs through simulations considering baseline lengths and heading uncertainties.

    • Main Results:

    • The proposed method achieved positioning accuracy better than 10 cm in static and dynamic field tests.
    • Demonstrated significantly superior performance compared to conventional RTK solutions in GNSS-harsh environments.
    • Successfully fixed integer ambiguities in a short time using the developed rounding scheme.

    Conclusions:

    • The novel GNSS positioning method offers a reliable and efficient alternative to traditional RTK.
    • The technique is particularly effective in environments with limited satellite visibility, providing high-accuracy relative positioning.
    • Fixed baseline length and heading measurements are key enablers for rapid and accurate integer ambiguity resolution.