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Satellite-based augmentation system (SBAS) is an auxiliary satellite positioning system, which is a crucial method for enhancing the accuracy of global navigation satellite systems (GNSS) positioning. The paper will first introduce development and principles of SBAS, and de- scribes system's workflow, with a focus on analyzing the error terms in current GNSS positioning navigation. Then, error correction methods are introduced, with an analysis of ionospheric delay errors and tropospheric delay errors. Subsequently, system accuracy is analyzed, and key indica- tors in the performance evaluation process are introduced. Finally, the paper summarizes the entire content, provides conclusions, and suggests possible future research directions.

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Research on Key Technologies of Navigation and Positioning Based on GAGAN and Analysis of System Accuracy

  • 会议论文

  • 发表日期：

    2026年

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  • Weiqi Wang,
  • Hongzheng Zeng,
  • Qizhen Sun,
  • Wei Wei,
  • Wen Zeng,
  • Xue Feng

摘要

Satellite-based augmentation system (SBAS) is an auxiliary satellite positioning system, which is a crucial method for enhancing the accuracy of global navigation satellite systems (GNSS) positioning. The paper will first introduce development and principles of SBAS, and de- scribes system's workflow, with a focus on analyzing the error terms in current GNSS positioning navigation. Then, error correction methods are introduced, with an analysis of ionospheric delay errors and tropospheric delay errors. Subsequently, system accuracy is analyzed, and key indica- tors in the performance evaluation process are introduced. Finally, the paper summarizes the entire content, provides conclusions, and suggests possible future research directions.