4Brunner F K, Welsch W M. Effect of the troposphere on GPS measurements [J]. GPS World, 1993,4(1) :42-51.
5Van Der Marel H. Virtual GPS reference stations in the netherlands [C]//Proceedings ION GPS-98, Nashville, 1998 : 49-58.
6Hopfield H S. Applied Phys. lab report CPO 15[R]. Baltimore, Maryland: Johns Hopkins University, 1972.
7Hopfield H S. Two-quadratic tropospheric refractivity profile for correcting satellite data[J] Journal of Geophysical Research, 1969,74(18) : 4487-4499.
8Hopfield H S. Tropospheric effect on electromagtically measured range: prediction from surface weather data[J]. Rad Sci. , 1971(6) : 357-367.
9Saastamoinen J. Contributions to theory of atmospheric refraction[J] Journal of Geodesy, 1972,105 (1) :279-298.
10Saastamoinen J. Introduction to practical computation of astronomical refraetion[J]. Journal of Geodesy, 1972,106(1) : 383-397.