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6[2]Hofmann-Wellenhof B,Lichtenegger H,Collins J.Global Positioning System Theory and Practice[M].New York:Springer Wien,2001
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8[4]Kelly R J,Davis J M.Required Navigation Performance(RNP) for Precision Approach and Landing with GNSS Application[J].Navigation.1994.41(1):1-30
9Hansen A J. Tomographic Estimation of the Ionosphere Using Terrestrial GPS Sensors[M].Silicon Valley: Stanford University Press, 2002.
