MTG. Scan assembly electronics (SCAE)

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  • Client: ESA
  • Country: Spain
  • Start date: 2012
  • Ending date: 2017
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The main function of the MTG (Meteosat Third Generation) scan assembly electronics (SCAE) is to provide a controlled, high precision scan and sweep movement of the mirror of the main telescope.

To achieve this, the electronics house the following functions:

  • Accurate control and input of the dual axis motors: N/S (North/South) and E/W (East/West)
  • Control and input of blocking/unblocking motors of the mechanism
  • Monitoring and fault management
  • Communications with the spacecraft
  • Conditioning and internal distribution of power
  • Data processing and management 

Most of these functions take place in SW developed by SENER on a LEON2 platform. 

The unit consists of a nominal and a redundant section, both identical. Each of these sections houses the modules:

  • Modules:
  • DC/DC converter
  • Backplane, to interconnect modules
  • Processing module
  • Acquisition and motor drive module 
  • Mass: 5 Kg
  • Size: Length: 247; height: 150; width: 175
  • Thermal power:
    • Operating range: -20ºC: +50ºC
    • With start at - 25ºC
  • Redundancy: Two fully redundant sections in a single box.
  • Input: Input bus: +28 V
    • Power consumption: 25-30 W (approximate values according to the operating mode)
  • Observability and controllability:
    • Each section has various 1553 MilBus and SpaceWire communication buses for control and monitoring and dispatch of data, respectively
    • The unit implements a reduced set of PUS services
  • Features of the processing module:
    • Processor: LEON2 AT913E
    • Link SpW up to 80 Mbit/s (with capacity of 200 Mbit/s)
    • PROM memory: 32 kB
    • EEPROM memory: 4Mbit
    • SRAM memory: 5 MB (including fault detection and correction (EDAC)

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