Sentinel-1 European Radar Observatory is a polar orbiting satellite for operational SAR applications (Synthetic Aperture Radar). The constellation of two C-band radar satellites will provide continuous all-weather day/night imagery for user services, especially those identified in ESA’s GMES service elements programme and on projects funded by the European Union (EU) Framework Programmes.

The ICM (Instrument Control Module) is in charge of controlling the SAR and interfaces directly with the on-board computer The ICM is to be equipped with a comprehensive set of interfaces for communicating with the platform, and for control and monitoring of the modules and units within the instrument.

The ICM includes :

  • 10 full duplex bidirectional SpaceWire links (ASIC)
  • 1 redundant MIL-STD-1553 bus controller and interface operating in RT mode (Bus A and Bus B)
  • 2 independent CAN controller and interface bus
  • Standard devices like timers, UART, general purpose I/O, Watchdog
  • A Debug Support Unit (DSU) to permit non-intrusive debug and LEON control via a dedicated serial link

The main critical functions are:

  • ECSS-40-B fully compliant BSW
  • 3MB for ASW storage
  • SpaceWire @200 MHz
  • Scalability in interfaces

Swiss Quality

Since the Sentinel 1 satellite launch in April 2014, the radar has been delivering high quality images showing that the ICM is meeting expectations. The mission has now passed into operational mode. 

Engineering talent

It is one of the first missions successfully flying with LEON 2 processor and SpaceWire router. It demonstrates Syderal’s extensive engineering experience in ICM which dates back to the  early ’90s.


Syderal has demonstrated support and flexibility throughout the product’s evolution and development phases.