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Delfi-C3 CDHSAdding backup for essential
functionsin case of OBC failure
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Introduction

• ME
• Eddie van Breukelen, MSc student
• Attitude Control and Command and Data handling
  Engineer for the Delfi-C3 mission
• TU Delft, Aerospace Engineering, Space Systems
  Engineering and Technology

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Introduction

• Mission
• Command and Data Handling System (CDHS)
• OBM Backup concept
• Voltage Controlled Oscillator
• Conclusion

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Mission
Intro - Mission - CDHS - OBM - VCO - Conclusion
Autonomous Wireless Sun Sensor

• In-orbit test of

Primary payload Thin Film Solar Cells
Advanced Transceiver
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Mission
Intro - Mission - CDHS - OBM - VCO - Conclusion
Start of project December 2004 Current
status Preliminary design Launch date End
of 2006
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CDHS Development Framework
Intro - Mission - CDHS - OBM - VCO - Conclusion

• Satellite design is still flexible
• Pumpkin Inc. Flight mcu board
• Wish for redundant architecture for primary
  payload -gt OBM concept
• KISS, for instance resulting in the wish not to
  utilize a battery

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System architecture
Intro - Mission - CDHS - OBM - VCO - Conclusion
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Physical architecture
Intro - Mission - CDHS - OBM - VCO - Conclusion
PC/104 size PCBs
PC/104 bus connector
No Microhard Trx
Dual-sided connector
Flight mcu board
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Available hardware software
Intro - Mission - CDHS - OBM - VCO - Conclusion

• Development equipment
• Development board
• Flash Emulation Tool
• Compiler
• Integrated Development Environment
• Prototype OBM

• For flight
• Texas Instruments MSP430F149 microcontroller
• Pumpkin Flight mcu Board
• Salvo RTOS

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OBM On-Board MORON
Intro - Mission - CDHS - OBM - VCO - Conclusion
Space technology Its all about acronyms

• OBM
• On-Board MORON
• Malfunctioning OBC Recovery OptioN
• On-Board Computer

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OBM Essential functions
Intro - Mission - CDHS - OBM - VCO - Conclusion

• Achieve deployment
• OBC watchdog (reset or shut off)
• Interface with TFSC measurement system
• Convert TFSC measurements for transmission
• Interface with AMSAT Transceiver

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OBM concepts
Intro - Mission - CDHS - OBM - VCO - Conclusion

• From least likely to most likely
• Launch 2 satellites -)
• 2 flight mcu boards
• Redundant microcontroller for TFSC measurement
• Smart EPS -gt deployment, external watchdog for
  OBC
• Voltage controlled oscillator

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Voltage controlled oscillator
Intro - Mission - CDHS - OBM - VCO - Conclusion
Voltage Period
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Voltage controlled oscillator
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Voltage controlled oscillator
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Voltage controlled oscillator
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Conclusion
Intro - Mission - CDHS - OBM - VCO - Conclusion

• Pumpkin flight mcu board
• No custom solution
• Shorter development time
• Added redundancy
• Deployment control and external watchdog
• TFSC measurement

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Thank you for you attention

• Questions?
• Contact info
• Eddie van Breukelen
• e.d.vanbreukelen_at_delfic3.nl
• www.delfic3.nl

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Additional slides

• VCO signal conversion (2)
• VCO block diagram
• VCO schematic diagram
• VCO pictures (2)

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Voltage controlled oscillator
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Voltage controlled oscillator
Voltage Period
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Voltage controlled oscillator
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Voltage controlled oscillator
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Voltage controlled oscillator
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Voltage controlled oscillator