Galileo signal and positioning performance analysis based on four IOV satellites

Changsheng Cai, Xiaomin Luo, Zhizhao Liu, Qinqin Xiao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)


With the availability of Galileo signals from four in-orbit validation (IOV) satellites, positioning with Galileo-only observations has become possible, which allows us to assess its positioning performance. The performance of the Galileo system is evaluated in respect of carrier-to-noise density ratio (C/N0), pseudorange multipath (including noise), Galileo broadcast satellite orbit and satellite clock errors, and single point positioning (SPP) accuracy in Galileo-only mode as well as in GPS/Galileo combined mode. The precision of the broadcast ephemeris data is assessed using the precise satellite orbit and clock products from the Institute of Astronomical and Physical Geodesy of the Technische Universität München (IAPG/TUM) as references. The GPS-Galileo time offset (GGTO) is estimated using datasets from different types of GNSS receivers and the results indicate that a systematic bias exists between different receiver types. Positioning solutions indicate that Galileo-only SPP can achieve a three-dimensional position accuracy of about six metres. The integration of Galileo and GPS data can improve the positioning accuracies by about 10% in the vertical components compared with GPS-only solutions.
Original languageEnglish
Pages (from-to)810-824
Number of pages15
JournalJournal of Navigation
Issue number5
Publication statusPublished - 1 Jan 2014


  • Galileo
  • GPS
  • Navigation

ASJC Scopus subject areas

  • Oceanography
  • Ocean Engineering


Dive into the research topics of 'Galileo signal and positioning performance analysis based on four IOV satellites'. Together they form a unique fingerprint.

Cite this