||In March 2002, the European Space Agency launched Envisat, an advanced polar-orbiting Earth
observation satellite which provides measurements of the atmosphere, ocean, land, and ice.
The Envisat satellite has an ambitious and innovative payload that will ensure the continuity of the
data measurements of the ESA ERS satellites. Envisat data supports earth science research and allows
monitoring of the evolution of environmental and climatic changes. Furthermore, the data will facilitate the
development of operational and commercial applications.
The PPF and Envisat Programmes have emerged from two basic roots:
- The development of a multimission Polar Platform for future Earth observation missions, initially
started as an element of the Columbus Space Station Programme.
- The Polar Orbiting Earth Observation Mission (POEM-1), initially conceived as a combined mission
with instruments for scientific application, research, and operational meteorology. This mission, to be
based on the Polar Platform, was to be the successor of ERS.
The Polar Platform (PPF) development activities started in 1990, following the selection of
the Polar Platform as a derivative of SPOT-4, by the ESA council. An industrial proposal was submitted and
evaluated at the end of 1990 and implemented starting in early 1991. Since then, the following major
external programmatic events have taken place:
- deletion of multimission requirements and related activities for cost saving reasons;
- splitting of the first mission POEM-1 into Envisat (the environmental mission) and METOP-1 (the
meteorological mission) in mid-1993;
- several iterations on cost savings/descoping actions executed in mid-1993, early 1994, and the end
of 1995 to reduce overall programme costs in industry and ESA;
Final negotiations were completed with industry in mid-1995 and the PPF phase C/D
contract for the development and integration of the Polar Platform with the Envisat instruments was signed
in July 1995.
The mission, the development of the payload instruments for Envisat started after the split
of POEM-1 into Envisat and METOP-1 at the Ministerial ESA council meeting in December 1993.