PAGE CONTENTS
Objectives
The objective of the STRIVING cIU in-orbit validation/demonstration project was to gain flight heritage for the Beyond Gravity Finland Automotive/COTS component based Interface Electronics circuits.
The cIU electronics circuits are used in Beyond Gravity Constellation Onboard Computer (cOBC) and constellation Remote Terminal Unit (cRTU) products Power Drive and Analog IO board (PDIO Board).
Challenges
The main technical challenge was the spacecraft payload interface power supply voltage range incompatibility.
The spacecraft is supplying 18V-25.2V operation voltage to payload and cIU was designed to 22V-38V operation voltage range. The cIU DCDC converter redesign was required.
System Architecture
cOBC/PDIO is based on Automotive/COTS components. All components are TID tested to >30 RAD level by Beyond Gravity team. Design is latchup free, and components are SEE tested.
The product is highly integrated, providing spacecraft avionics and key interfaces in a single unit.
The PDIO Key features
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Off-the-shelf solution available at short lead times and an attractive price point
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Fast and easy integration into the cOBC, at the quantity needed, using backplane-less solution
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Highly configurable in software
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Support for both redundant and single string solutions
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Manufacturing highly automated and optimized for large quantities.
PDIO key functions:
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DCDC Converter
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CAN bus TM/TC protocol
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Automotive grade, dual core lock step
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Pulse Matrix Command outputs
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Secondary Voltages
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Stepper Motor drive for SADM and antenna mechanisms
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Magnetorquer drive interface
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Analog and Digital signal acquisition interface.
Plan
The key tasks:
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System design related to cIU interfacing with Spacecraft payload interface.
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The cIU health telemetry data collection SW implementation
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Additional load and stimuli board design and MAIT
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PFM and FM board MAIT
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cIU interoperability testing against the spacecraft payload interface simulator.
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The cIU health telemetry data analysis after the IOD mission
Current Status
The project was completed without in-orbit demonstration due the cancellation of SITAEL’s STRIVING maiden in-orbit demonstration/validation mission. However, applicable cOBC/PDIO Flight Model deliveries are ongoing. Flight heritage for the product will be achieved on upcoming customer missions.
