gnss-ppp

代码说明：

/*------------------------------------------------------------------------------ * ppp.c : precise point positioning * *          Copyright (C) 2010-2016 by T.TAKASU, All rights reserved. * * options : -DIERS_MODEL  use IERS tide model *           -DOUTSTAT_AMB output ambiguity parameters to solution status * * references : *    [1] D.D.McCarthy, IERS Technical Note 21, IERS Conventions 1996, July 1996 *    [2] D.D.McCarthy and G.Petit, IERS Technical Note 32, IERS Conventions *        2003, November 2003 *    [3] D.A.Vallado, Fundamentals of Astrodynamics and Applications 2nd ed, *        Space Technology Library, 2004 *    [4] J.Kouba, A Guide to using International GNSS Service (IGS) products, *        May 2009 *&nb