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Optimal Divergence-Free Hatch Filter for GNSS Single-Frequency Measurement.

Byungwoon Park1, Cheolsoon Lim2, Youngsun Yun3

  • 1School of Aerospace Engineering, Sejong University, Seoul 05006, Korea. byungwoon@sejong.ac.kr.

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Summary
This summary is machine-generated.

This study introduces an improved single-frequency Hatch filter using satellite-based augmentation system messages. The new filter enhances accuracy and reduces errors, making low-cost receivers perform like dual-frequency ones.

Keywords:
GNSSHatch filterSBASdivergence-free Hatch filtersmoothing window width

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Area of Science:

  • * GNSS (Global Navigation Satellite System) positioning
  • * Signal processing and filtering techniques

Background:

  • * The Hatch filter is a carrier phase-based code-smoothing technique.
  • * It effectively reduces pseudo-range noise but can introduce ionospheric errors for low-elevation satellites.
  • * Single-frequency (SF) receivers are prevalent but often limited in accuracy compared to dual-frequency (DF) systems.

Purpose of the Study:

  • * To propose an optimal single-frequency (SF) divergence-free Hatch filter.
  • * To mitigate ionospheric divergence errors using satellite-based augmentation system (SBAS) messages.
  • * To enhance the performance of low-cost SF GNSS receivers.

Main Methods:

  • * Development of an optimal SF divergence-free Hatch filter.
  • * Integration of SBAS messages to correct ionospheric divergence.
  • * Application of an optimal smoothing constant for the filter's window width.

Main Results:

  • * The proposed filter demonstrates performance comparable to DF divergence-free Hatch filters.
  • * Horizontal error was reduced from 57 cm to 37 cm.
  • * Vertical accuracy improved by 25% compared to the conventional Hatch filter.

Conclusions:

  • * The optimized SF Hatch filter effectively reduces ionospheric errors using SBAS data.
  • * This advancement significantly improves positioning accuracy for SF GNSS receivers.
  • * The proposed filter offers a cost-effective solution to achieve DF-level DGPS performance with SF receivers.