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IEEE Aerospace Conference Yellowstone Conference Center Big Sky, Montana 4 March 2007

Development of an Off-the-Shelf Bus for Small Satellites. IEEE Aerospace Conference Yellowstone Conference Center Big Sky, Montana 4 March 2007. http://www.kysat.com. KySat1 Background . CubeSat Standard CalPoly / Stanford 1kg, 10cm Cube 80 Universities

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IEEE Aerospace Conference Yellowstone Conference Center Big Sky, Montana 4 March 2007

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  1. Development of an Off-the-Shelf Bus for Small Satellites IEEE Aerospace Conference Yellowstone Conference Center Big Sky, Montana 4 March 2007 http://www.kysat.com

  2. KySat1 Background • CubeSat Standard • CalPoly / Stanford • 1kg, 10cm Cube • 80 Universities • 24 Launched, 6 Operational, 14 Lost • Management • Multi-disciplinary, multi-university • Public, private, academic “owners” • 7 Students, 5 Universities • 10 Week “Intenrship” in California

  3. KySat1 Requirements • Infrastructure Creation • Continuous-Wave and Digital Beacons • Data Collection and Storage (Telemetry Windows) • HAM Radio Communication • High-Speed Communication • Photo Capture • Satellite Health Reports

  4. KySat1 Spacecraft Bus • PC104 Form-Factor • Processing Module • VHF/UHF HAM Radio Module • S-Band Radio • Electrical Power System • System Support Module • Camera System

  5. KySat1 Spacecraft Bus

  6. Bus: Processing Module • Pumpkin Inc. • Texas Instruments MSP430F1612 • 8 MIPS @ 500uA / MHz • Power Regulation (linear) • Over-Current Protection • Remove Before Flight and Launch Switches • JTAG Programming Connector • Crystal Oscillators (2) • USB Connector (pre-launch debug) • SD Card Slot

  7. Bus: Radios • UHF / VHF • StenSat • AX.25 Compatible • 1/4 Watt EIRP (now 1 Watt) • 1200 bits-per-second over-the-air • Current / Voltage Monitoring on TX and RX • Analog Audio Output / Input • S-Band • Microhard MHX2400 • 1 Watt • 2.4 GHz • 115200 baud

  8. Bus: Power • Clyde Space Limited • Hands-Off Device • I2C Telemetry & Control • Rail Reset • 3.5 to 25 Vin • > 90% Efficiency • 8.4 Volt Lithium-Polymer, 7.2 Watt-Hours • Automatic Battery Heater Control • VBat @ 2A, 5V @ 1.2A, 3.3V @ 1A

  9. Bus: System Support Module • KySat Team Designed / Developed • Real Time Clock • Watch Dog Timer • Temperature Compensated Oscillator (2ppm) • DTMF Receiver / Decoder • Supervisory Microcontroller • Antenna Deployment Switches • Camera Power Control Switches • Camera Heater Control Switches • Camera Connection Header

  10. Bus: Camera Module • CO Media • 5 grams • JPEG Compression • 4 Resolutions: 640 x 480 to 80x64 • 0 to 25 Celsius (heated)

  11. Mechanical Systems • Frame from Pumpkin Inc. • MIL-W-16878/6 Type ET Wiring • Spectrolab Products for Solar Cells • Three “Tape” Antennas • Cotton Line Deployer

  12. Ground Stations • Multiple VHF/UHF Stations • Single S-Band Station • SatPC32 Rotor and Radio Control • Custom Ground Station Software

  13. Flight Software • Salvo Non-Preemptive Operating System • EFFS-THIN FAT File System

  14. Payloads Photographs S-Band Radio (High Bandwidth) Audio Playback Cross-Band Repeater Data Morse Code Digital Beacons File Transfer Audio Telemetry Other DTMF Commanding Command Schedule Power Mode Switching What Will KySat1 Do?

  15. ______________ Virtual Network Partner “ First, the vision for space exploration is a multi-generational program. It will require decades. The people who will be taking us to Mars and beyond are in elementary and middle school. ” - NASA Administrator Mike Griffin 6/10/2005 http://www.kysat.com

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