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GNSS performance enhancement using measurement estimation in harsh environment.

Jae Hwan Bong1, Doyoung Kim1, Seongkyun Jeong1

  • 1Department of Human Intelligence Robot Engineering, Sangmyung University, Cheonan, Korea.

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Summary
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Global Navigation Satellite Systems (GNSS) performance degrades in urban areas due to signal blockage. This study introduces novel techniques to maintain accurate positioning even with reduced satellite visibility.

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Signal Processing

Background:

  • Global Navigation Satellite Systems (GNSS) are crucial for global positioning and timing, with expanding applications in commercial and social sectors.
  • GNSS performance significantly degrades in harsh environments like urban canyons due to signal blockage and multipath errors, increasing navigation solution errors.
  • Reduced satellite visibility exacerbates the dilution of precision (DOP), directly impacting the accuracy of GNSS-based navigation solutions.

Purpose of the Study:

  • To propose and validate methods for enhancing GNSS navigation performance in signal-degraded environments.
  • To mitigate the negative effects of reduced satellite visibility and multipath interference on positioning accuracy.
  • To ensure continuous and reliable navigation capabilities despite environmental challenges.

Main Methods:

  • Development of techniques including range differences, receiver clock error hold, and the utilization of virtual satellites.
  • Validation of proposed methods through simulations in environments with reduced visible satellites.
  • Comparative analysis of navigation performance before and after applying the proposed techniques.

Main Results:

  • Simulations demonstrated that proposed methods effectively improve navigation performance in harsh environments.
  • Each technique contributed to recovering navigation accuracy, creating conditions similar to normal operational environments.
  • Navigation performance, though initially deteriorated with fewer visible satellites, showed gradual recovery upon applying the proposed methods.

Conclusions:

  • The proposed techniques successfully maintain continuous navigation performance even when satellite signals are blocked.
  • These methods offer a viable solution for reliable GNSS operation in challenging urban and obstructed environments.
  • Continuous navigation accuracy can be achieved through the strategic application of these signal processing and augmentation techniques.