Ionospheric correction method for precise positioning with GPS active network

Shan Gao, Wu Chen, Cong Wei Hu, Yong Qi Chen, Xiaoli Ding

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The ionospheric delay error is a major error source which degrades the positioning accuracy in network real time kinematic (RTK) positioning over a long distance. Different approaches are proposed to estimate GPS errors based on GPS reference network, such as virtual reference stations (VRSs) and network corrections. A new method is used to model the ionospheric total electronic content (TEC) distribution in space. Unlike most ionospheric models, only the ionospheric delays along the satellite tracks are modelled. Therefore, the models are of high precise resolution of the ionospheric TEC distribution in both spatial and temporal scales. A new algorithm is used to solve the equation singularity problem. Experiments demonstrate that the new ionospheric correction method can be used to describe the ionospheric variation at a low latitude area where ionospheric activities are strong. Also, the accuracy of the ionospheric model is enough to support centimeter-level positioning within the network. As ionospheric models are satellite-based models (each satellite has one model), the model parameters can be easily incorporated with the existing differential GPS Radio Technical Commission for Maritime Service (DGPS RTCM) 104 format.
Original languageEnglish
Pages (from-to)107-114
Number of pages8
JournalTransactions of Nanjing University of Aeronautics and Astronautics
Volume22
Issue number2
Publication statusPublished - 1 Jun 2005

Keywords

  • GPS
  • Ionospheric model
  • Precise positioning

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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