4Charles R.Cahn,Donald K.Leimer,Charles L.Marsh,et al.Software Implementation of a PN Spread Spectrum Receiver to Accommodate Dynamics[J].IEEE Trans.on Communications,1977:25(8):832-840.
5European Space Agency,Galileo Joint Undertaking.Galileo Open Service Signal In Space Interface Control Document (OS SIS ICD) Draft 0[S].May 23,2006.
6Guenter W.Hein,Jeremie Godet,Jean-Luc Issler,et al.Status of Galileo Frequency and Signal Design[J].Proc of ION GPS-2002,2002:266-278.
7Klobuchar J A. Propagation Environmental Effects on GPS [C]//ION GPS-2001 Tutorial, Salk Lake City, Utah, 2001.
8Zemin Wang et al, Triple-Frequency Method for High-Order Ionospheric Refractive Error Modeling in GPS Mod- ernization [ C ] //The International Symposium on GNSS/GPS, 2004.
9Bassiri S. Three-Frequency Ranging System and Their Applications to Ionospheric Delay Calibration [ R TDA Progress Report 42-103, 1990: 14-20.
