On Board Data Handling & Control Units

DHOB Data Handling On Board Computer - Unmanned Space Vehicle (USV), 2007
GNOB - Unmanned Space Vehicle (USV, 2007)
Remote Terminal Unit - Unmanned Space Vehicle (USV, 2007)
Mux-DeMux Board - ARGO Satellite (2007)
ACS & HK Boards - SAR Lupe Satellite (2006)
Data Handling Unit - Foton 12  (1999), Foton M1 (2002), Foton M2 (2005)

The range of products dedicated to On Board Data Handling & Control includes:

 • Avionic System
 • On Board Data Handling Units
 • On Board Computers
 • Remote Terminal Units
 • SpaceWire Routers and MUX/DEMUX
 • Actuator Driver Units
 • Harness

The units are all available in different versions up to full rad-hard in order to fulfil a wide range of technical and budget mission requirements


Data Handling Unit

 • Multiprocessor/multitasking unit based on the VME standard bus
 • Modular Architecture
 • Flexible Power Management
 • Architecture based on parallel processing techniques
 • High performances and multitasking capability
 • 32 bits microprocessor dedicated to the management of the image processing     resources
 • 16 bits microprocessor dedicated to the data communication and low power     management
 • 16 bits microprocessor dedicated to the high rate data downloading
 • Eight 8 bits microcontrollers (each dedicated to a specific payload)
 • 3 H/W processors for real time image preocessing 


Attitude Control System I/F and Housekeeping Boards  for Earth Observation Satellites 

 • Fully radiation hardned design
 • Digital section entirely based on FPGA
 • Redundant MIL-STD 1553
 • 98 analog signals (temperatures, currents, voltages)    Conditioning and Multiplexing
 • 4 analog outputs
 • 12 bit A/D and D/A
 • 5 asynchronous serial I/Fs
 • 16 I/O bi-level signal 


DHOB-Data Handling On Board Computer

 • Modular platform based on VME64 standard bus
 • PowerPC processor running at 400MHz
 • VxWorks Real Time OS
 • Redundant MIL-STD 1553 transfer rate: 1Mbit/s
 • CCSDS standard Telemetry up to 10Mbit/s
 • CCSDS standard Telecommand up to 4kbit/s
 • Three SpaceWire I/Fs up to 40Mbit/s each
 • 4 Gigabit SSMM with 40Mbit/s of transfer rate
 • Redundant and fault tolerant power conditioning 


GNOB-Guidance,Navigation & Control On Board Computer

 • Modular platform based on VME64 standard bus
 • PowerPC processor running at 400MHz
 • VxWorks Real Time OS
 • 4 LVDT  Conditioning and Current Transmitters
 • 1 Shut Off Valve driver
 • 1 Pressure and 1 Temperature sensor acquisition
 • 4 Gigabit SSMM with 40Mbit/s of transfer rate
 • Redundant MIL-STD 1553 transfer rate: 1Mbit/s
 • Three SpaceWire I/Fs up to 40Mbit/s each
 • Redundant and fault tolerant power conditioning

 


RTU Remote Terminal Unit

 • Modular microcontrolled platform based on custom bus
 • Redundant MIL-STD 1553 transfer rate: 1Mbit/s
 • Three different conditioning and acquisition modules:
       1.Temperature Acquisition Board (TAB)
       2. Accelerometers Acquisition Board (ACAB)
       3. Strain gauge & Pressure Acquisition Board (SPA)
 • Acquisition Modules provided with local control and processing capabilities     (based on FPGAs)
 • Selectable acquisition parameters and operating modes
 • 256 Mbytes solid state mass memory


DHU Central Unit

 • Modular Platform based on VME64 standard bus
 • PowerPC 750 processor running at 400MHz
 • VxWorks Real Time OS
 • Data collection and command distribution to up to 16 Payloads
 • Temporarily storage of downloadable TM
 • Permanent storage of TM onto the FSM (Fast Storage Memory)
 • Direct/time tagged commands distribution
 • HK data management
 • FDIR management
 • Up to 16 bidirectional RS-422 asynchronous serial links, individually configurable
 • Up to 4 spacewire channels working up to 50Mbit/s
 • Links and protocols are managed by 3 Actel FPGA´s


ACS, HK Boards

TSD designed, developed and manufactured the EM, the QM and FMs of the Housekeeping (HK) and of the Attitude Control System (ACS) I/F for the SAR-LUPE Satellite Management Unit.

 • Fully radiation hardened design
 • Digital section entirely based on ACTEL Rad-tolerant FPGA
 • differential [-5;5]V analog I/O
 • differential (configurable via jumper [0;5]V or  [-5;5]V) analog inputs
 • differential bi-level & single ended I/O
 • 12 differential analog inputs[0:100]mV
 • 48 channels for the conditioning/ acquisition of PT1000 Thermistors
 • 8 RS422 differential I/O
 • 1 SpaceWire I/F running @ 50Mbit/s
 • 8 full-duplex fully configurable UART controllers
 • 8 ports (2 acting as master and 6 acting as slave) SpaceWire MUX-DEMUX working at 50Mbit/s
 • 4 D/A converter with 12 bit resolution 3 full H-bridge drivers with over-current protection 


Mux-Demux Board

The Mux-DeMux board is dedicated to on board space application for the route the Spacewire packets between 8 nodes Spacewire. It is based on a Rad-Tolerant RT-AX FPGA and has the following main specifications:

 • Fully radiation hardened design
 • 100% Error free
 • Hard Wired Routing Matrix
 • 2 Master nodes
 • 6 Slave nodes
 • Programmable Asymmetric Node Routing
 • Selectable Priority on Node transfer
 • Error Management Control
 • Virtual Channel to configure MuxDemux and debug purpose
 • Power Consumption : 1.25 W
 • Average data rate: 50Mbits/s for each node
 • Dimension : 143 (W) × 100 (L) [mm]
 • Mass : 0.2 kg