Please note that the Envisat mission ended on 08 April 2012, following the unexpected loss of contact with the satellite. (See related news from 09 May 2012)
The details below are presented for historical and technical purposes, for the information of data users.
Specific Instrument Planning - Envisat
ASAR has 5 modes of operations: ASAR Image Mode, ASAR Alternating Polarization Mode, ASAR Wide Swath Mode, ASAR Globlal Monitoring Mode and ASAR Wave Mode, being the first three high bit rate modes and the remaining low bit rate modes. All these modes are mutually exclusive: at a single time, the ASAR instrument can only be operated with a single mode and sub-mode (i.e. unique imaging swath and polarisation).
Fixed planning and 'user on-demand' planning
The ASAR Low Bit Rate is used following a predefined and systematic planning; ASAR Global Monitoring mode over land and polar areas and ASAR Wave mode over oceans, when the instrument is not operated in High Rate mode. ASAR is operated according to a predefined Background Mission (BM) for ASAR low bit rate modes.
The ASAR High Bit Rate is operated according to user demand. In case of no user demand for a particular time slot, ASAR is operated according to predefined Background Regional Mission (BRM) for ASAR high bit rate modes.
During the period immediately following the Envisat orbital change of October 2010, the ASAR high Bit Rate is operated using a pre-defined observation scenario; this is for a period up to 3 month with a temporary reduced capacity
Background Regional Mission (BRM)
The aim of the BRM is to systematically cover some areas in the operations mode most requested by the user community and to fully exploit the resources of the satellite.
MERIS FR over Europe, Australia and Asia
ConstraintsWhile performing the instruments planning, the Mission Planners have to cope with the following system constraints:
More information on what is planned in the BM and in the BRM click here
Specific Instrument Planning - ERS
The SAR Wave Mode is switched on by default for the orbit segments in which the SAR Image Mode is not switched on, unless descoping is required due to limited tape recorder capacity or ATSR-2 high resolution activity.
Click here for detailed information on the planning of the SAR instrument.
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