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BDS Dual-Frequency Carrier Phase Multipath Hemispherical Map Model and Its Application in Real-Time Deformation

Ao Sun1, Qiuzhao Zhang1, Xingwang Gao1

  • 1School of Environmental and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China.

Sensors (Basel, Switzerland)
|July 29, 2023
PubMed
Summary

This study introduces a new method to reduce BeiDou Navigation Satellite System (BDS) multipath errors in deformation monitoring. The technique effectively mitigates errors from various satellite types, improving coordinate precision and ambiguity fixing rates.

Keywords:
BDSdeformation monitoringmultipathmultipath hemispherical mapsingle difference residuals

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Geodesy

Background:

  • Multipath delay errors in BeiDou Navigation Satellite System (BDS) monitoring are significant and influenced by the environment.
  • Existing algorithms struggle to efficiently mitigate multipath errors from diverse BDS satellite orbits (GEO, IGSO, MEO) in real-time.
  • The double difference observation model is insufficient for eliminating these complex errors.

Purpose of the Study:

  • To propose a novel dual-frequency multipath error reduction method for BDS real deformation monitoring.
  • To address the challenge of multipath error mitigation considering various BDS satellite orbit types.
  • To enhance the accuracy and reliability of deformation monitoring using BDS.

Main Methods:

  • Extraction of single-satellite error residuals based on a "zero mean" assumption.
  • Development of a dual-frequency multipath hemispherical map model tailored for different BDS satellite orbits (GEO, IGSO/MEO) with optimized grid densities.
  • Application of the model for multipath error elimination across different orbits and frequencies.

Main Results:

  • Effective elimination of low-frequency multipath delay errors in both observation and coordinate domains.
  • Post-correction precision achieved: 1.7 mm for horizontal coordinates and 4.6 mm for height coordinates.
  • Significant improvements: 50% increase in horizontal coordinate precision, 60% increase in height coordinate precision, and a 5-7% rise in ambiguity fixed rate.

Conclusions:

  • The proposed method effectively reduces BDS multipath errors for diverse satellite orbits.
  • The technique substantially enhances the precision of deformation monitoring coordinates.
  • Improved accuracy and reliability of BDS-based deformation monitoring are demonstrated.