4 Final Report - Emits - ESA

4 Final
Report
4.3.3.7 Electrical architecture
The electrical architecture is the essentially the same for all five focal planes:
• The focal plane comprising the detector array (for and ) and the Proximity Electronics Module
(PEM) housing all the functions requiring to be located close to the detector
• The Remote Electronics Module (REM) hosting the other functions specific to each focal plane
and providing the interface with the spacecraft data handling system. In order to minimise the
power dissipation on the PLM, the REM units are implemented on the SVM.
All detection chains are connected to a data bus interfacing with the spacecraft central processing unit
and the data downloading function. This modular architecture with an independent detection chain for
each focal plane allows flexibility in the PLM design and ensures robustness of the mission to a failure.
The control electronics (for thermal control and activation of calibration devices and filter wheels) can
be hosted in one of the REM as depicted in Figure 4.3-13 or in a dedicated electronics unit.
Thermal control
Calibration
Telescope
PAN optics UV-VNIR optics SWIR/MWIR optics TIR optics
CMOS array
PEM
PAN FPA
Video chain
Memory
Command/control &
data processing
Power supply
PAN REM
CMOS array
PEM
UV-Blue FPA
Video chain
Memory
Command/control &
data processing
Power supply
UV-blue REM
CMOS array
PEM
Red-NIR FPA
Video chain
Memory
Command/control &
data processing
Power supply
Red-NIR REM
TM/TC & data bus interface with SVM
Figure 4.3-13: Electrical architecture of the instrument
Hybrid array
Page 4-40 Doc. No: GOC-ASG-RP-002
Issue: 2
Astrium GmbH Date: 13.05.2009
PEM
MWIR FPA
Video chain
Memory
Command/control &
data processing
Power supply
MWIR REM
Hybrid array
PEM
TIR FPA
Video chain
Memory
Command/control &
data processing
Power supply
TIR REM
Cryocooler Cryocooler