After the first edition of this book was published at the end of 2003, I
was very happy to put the hard work of book writing behind me and
concentrate myself with my small team on the development of a
multi-functional GPS/Galileo software (MFGsoft). The experiences from
the practice and the implementation of the theory and algorithms into
the high standard software gave me a strong feeling that I would very
much like to revise and to supplement the original book, to modify parts
of the contents and to - port on the new progress and knowledge.
Furthermore, with the EU Galileo system now being realised and the
Russian GLONASS system under development; the GPS theory and algorithms
should be re-described so that they are also valid for the Galileo and
GLONASS systems. Therefore, I am grateful to all of the readers of this
book, whose int- est made it possible so that the Springer asked me to
complete this second edition. I remember that I was in a hurry during
the last check of the layout of the first edition. The description of a
numerical solution of the variation equation in Sect. 11. 5. 1 was added
to the book at the last minute in a limited extension of exactly one
page.