STI Remote Terminal Unit (RTU)
The cPCI-Serial-Space based Remote Terminal Unit (RTU) is designed to collect data from different avionic sensors and to control several avionic actuators.
The main part is a cPCI-Serial-Space based IO-Module that can be used centralized inside an onboard-computer (e.g. small satellites) or decentralized in a RTU (large satellites with distributed I/O’s).
The RTU is scaleable by using one or more I/O-modules. Based on this concept also cold- and hot redundancy architectures can be realized.
A dual core LEON3 processor provides enough processing power to perform pre-processing of sensor data.
Based on STI’s Core Avionics concept, the RTU provides also all protected supply voltages necessary to power the connected avionic components.
cPCI-Serial-Space IO-module, 6U, Engineering and qualification model
Remote Terminal Unit (RTU) key features
- Analogue and digital standard interfaces
- LCL protected supply voltages to power avionic or payload components
- Switched power outlets for heaters and coldgas thrusters
- Dual Core LEON3 processor, also usable for data pre-processing
- Connection to an onboard-computer via CAN-Bus or SpaceWire
- Standardized IO-module based on cPCI-Serial-Space standard
RTU architecture I/O-module example
Interfaces to external components (e.g. avionic components):
|Analogue voltage input||8|
|Analog input resistive pressure transducer||2|
|Supply voltage resistive pressure transducer||2|
|Discrete digital input||2|
|Discrete digital output||4|
|Supply voltage, analogous +/-5.. 10V||1|
|UART interface (TX+RX)||5|
|LCL protected power outlets||3|
|Pressure valve outlet||10|
The IO-module was developed within the “Onboard Computer System Architecture (OBC-SA) project which is cofounded by the German Federal Ministry of Economics and Technology.