Description: In this paper, the positioning accuracy of the positioning of each single GNSS constellation system inadequate, small visible star, positioning reliability problems, the Beidou GPS, GLONASS and GALILEO constellation information in the unified coordinates using least squares method combination of navigation and positioning. Compass/GPS/GLONASS/of GALILEO constellation group navigation and positioning can effectively improve the positioning accuracy and reliability of the user, the implementation of the multi-constellation receiver reference value
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