Acta Geodaetica et Cartographica Sinica ›› 2019, Vol. 48 ›› Issue (9): 1073-1087.doi: 10.11947/j.AGCS.2019.20190176

• Review •     Next Articles

Review of the development of LEO navigation-augmented GNSS

ZHANG Xiaohong1,2, MA Fujian1,2   

  1. 1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China;
    2. Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan 430079, China
  • Received:2019-05-07 Revised:2019-06-06 Online:2019-09-20 Published:2019-09-25
  • Supported by:
    The National Science Fundation for Distinguished Young Scholars (No. 41825009);The Wuhan Science and Technology Project (No. 2018010401011270)

Abstract: Low Earth orbit (LEO) constellation has the advantages of stronger received signal and rapider change of spatial geometry, which can be complementary to the GNSS constellation of medium-or high-Earth orbit, and has significant advantages in augmenting the accuracy, integrity, continuity and availability of GNSS, and has become a hotspot in the field of current satellite navigation. Firstly, this paper briefly presents the existing GNSS augmentation systems and summarizes the developing actuality of LEO navigation augmentation constellations at home and abroad.In allusion to LEO navigation augmentation, the advantages and disadvantages of the low-, medium-and high-Earth orbits used for satellite navigation are compared and analyzed. Moreover, the opportunities that LEO navigation augmentation system brings in terms of the combined precise orbit determination (POD), rapid and precise positioning, space weather monitoring, and indoor positioning are emphatically discussed.The challenges that the space segment, ground segment and user segment will face are also analyzed and pointed out.

Key words: low Earth orbit (LEO) navigation augmentation, LEO constellation, GNSS, satellite-based augmentation system, navigation and positioning, combined precise orbit determination (POD)

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