The Envisat dataset was provided by the CTOH/
LEGOS and covers the period from cycle 10 to cycle 93
(October 2002 to October 2010), up to the orbit change.
These GDR products consist in a compilation of several
standards (GDR-A, GDR-B and GDR-B + new POE
(Precise Orbit Ephemeris)) which principally differ in the
orbit determination (Table 1). For more details concerning
the precise orbit determination and the
terrestrial reference frames used