UZAY

On Board Computer and Flight Software

SMU

Satellite Management Unit

SMU is a robust, reliable and powerful flight computer compatible with different space orbits. Because of high reliable LEON3 processor architecture and modular structure of SMU it can be adapted to different space platform needs.

SMU provides the following features to the satellite flight segment:

Processing resources for the flight mission software
TM-TC services and interfaces with the RF communication chain
Controlling and Monitoring of satellite equipment through redundant databusses based on MIL-STD-1553B or CAN
Discrete commanding and monitoring interfaces compatible with ECSS-E-ST-50-14C
Time synchronization and distribution
Failure tolerant architecture based on redundancy and hardware protection

SMU Features

Key Features

Dual Core, High Reliable LEON3FT Based Microprocessor
RTEMS Real Time Operating System
CCSDS and ESCC Compatible TM-TC
Bootloader, Drivers and Board Support Packages, Flight Software (including AOCS software)
8 MB SRAM, 256 MB SDRAM, 2 MB PROM (All ECC protected)

Hardware FDIR Features

Over Current Protected Secondary Power Switches
Auto Reset Functionality for Power Switches after Current Protection
Soft Start Feature
Warm Redundant Processing Units (with SpaceWire communication)
High Reliable System Controller
Real Time Clocks (EMXO) with Cross Strapping
Internal Temperature Monitoring
Internal Current and Voltage Monitoring
Redundant Internal Databus

Budget

Supply 28V nominal (15V to 50V input voltage range)
Power: 38W (nominal)
Dimension: 293 mm x 279 mm x 294 mm (W x L x H)
Weight 12.7kg

Interfaces

2 x 3 TC Input (RS-422), 2 x 3 TM Output (RS-422)
4 + 4 System Alarm (RS-422)
2 x 2 MIL-STD-1553 2 x 4 CAN
2 x 2 UART (RS-422)
2 x 1 JTAG
Synchronization :
2 x 2 PPS In (RS-422)
2 x 6 Sync Out (RS-422)
HV-HPC 2 x 16
LPC 2 x 10
ASM 2 x 18
TSM1 2 x 128
TSM2 2 x 33
BSM/BDM 2 x 16

Heritage / Platforms

IMECE, TURKSAT 6A, AYAP-1

Environments / Reliability

Thermal:-20 to +50 C
Vibration
Shock
EMI/EMC: MIL-STD-461
Lifetime: 5 to 15 years
SEU tolerant
Latchup Immune

Corporate

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