ENVISAT1 Mission Planning System


F. Spoto, F. Demond, F. Allard - D/OEE-N-NW
FSPOTO@JW.ESTEC.ESA.NL
ESA/ESTEC 

Abstract

The Envisat1 Ground Segment  Mission Planning system is functionally split
between three distinct entities: the Payload Data Segment,  the Flight
Operation Segment, and the Reference Operation Office.

The PDS Mission Planning function is specified to perform the regional
Envisat1 mission which is the contribution to the mission for which the
user community can request a great variety of different operational modes
for the ASAR and for the MERIS instruments used in their high resolution
modes.
It schedules the utilisation of X band stations, utilisation of DRS, and
produces all relevant parameters to be uplinked to the satellite by the FOS
to support the mission.

The FOS Mission Planning function is specified to carry the Global
monitoring mission for which permanent operation of all Envisat1 payload
instrument is requested. It also monitors satellite resources availability
and is in charge of the failure handling.

The reference Operation Office is in charge of the coordination of the
operational request between the PDS and the FOS MPS.

The paper will therefore present the overall MPS architecture and the
organization of the different functions between the Reference Operation
Office, the PDS, and the FOS.

The paper will introduce for each Envisat1 microwave and optical payload
instruments the specificities relevant for mission planning aspects: type
of mission, rules, operational constraints.
The paper will present a solution retained for the harmonisation and
configuration and control of key functions of the Mission planning system
which are ensured by the development of CFI software packages by the
project at ESTEC to be integrated within one or several of the three
elements of the MPS: Orbit propagator, DRS terminal pointing vector
generator, station and DRS visibility determination software, star pointing
vector generators, specific instrument parameter generators, swath
representation software, etc...

The paper will explain the solution retained to merge different operational
requests, and to report the planned and already performed operations to the
users.

The paper will also address the verification programme foreseen which
culminates with the utilisation of the MPS at the opportunity of a
Satellite Verification Test prior to the launch.