Telecommunication & Observation


Since 2006, the IASI instrument has equipped European Metop satellites. Its strength: in addition to temperature and humidity, it measures more than 25 atmospheric components with great precision. CNES is working on its "evolution": IASI-NG so that these essential data for weather forecasts, pollution and climate monitoring do not stop.

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- Mechanism

Image IASI
Image espace


Comat is developing the mechanical part of the SCan Mechanism (SCM) of the IASING instrument (Infrared Atmospheric Sounding Interferometer, New Generation), which belongs to the series of MetOp- SG satellites (Meteorological Operational Satellite, Second Generation).

This development is performed in collaboration with ADS, in charge of building the IASI-NG instrument (and also of supplying le electronic part of the SCM).


2-axis Pointing Mechanism

Stop-and-stare motion to scan the Earth (across the spacecraft track)
Continuous motion to offset spacecraft velocity

Innovative Parallel Architecture


Mechanical stress during launch
-25°C to +55°C (non-operational)
0°C to 35°C (operational)

Pointing Performances (requirements)

Accuracy: ≤ 250 μrad (1σ)
Stability: ≤ 50 μrad (1σ)

7.75 years Lifetime + 15 years Storage