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AMSAT Fox-1 Overview

AMSAT Fox-1 Overview . AMSAT Engineering Team 2011 Space Symposium. Fox-1 Introduction. AO-51 replacement 1-Unit CubeSat (4" x 4" x 4") Target orbit 650 km Magnetically stabilized FM transponder IHU for telemetry and command Science experiment. Fox-1 Operational Modes.

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AMSAT Fox-1 Overview

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  1. AMSAT Fox-1 Overview AMSAT Engineering Team 2011 Space Symposium

  2. Fox-1 Introduction • AO-51 replacement • 1-Unit CubeSat (4" x 4" x 4") • Target orbit 650 km • Magnetically stabilized • FM transponder • IHU for telemetry and command • Science experiment

  3. Fox-1 Operational Modes • Transponder Mode • FM repeater • Telemetry data sent as low-speed FSK in sub-audible band • Command Mode • Transmitter dedicated for data downlink • High-speed FSK • More power available for running experiment

  4. Special "ZombieSat" Features • Designed to extend usable life • FM Transponder will operate with dead cpu • FM Transponder will operate without ground station intervention • FM Transponder will operate while in sunlight even with dead (shorted) battery

  5. Fox-1 Systems • Power System • Internal Housekeeping Unit (IHU) • RF System • Antennas • Science Experiment

  6. RF System Fox-1 System Diagram Power System Solar Cells Battery Power bus 70 cm Antenna 2 m Antenna Science Experiment IHU Sensors

  7. Power System - Solar Panels • 6 solar panels • 2 cells per panel • Spectrolab Ultra Triple Junction • Space-rated, high radiation tolerance • 28% conversion efficiency

  8. Solar Cell Characteristics Spectrolab UTJ, 27cm2, Full Sun, 28C

  9. Maximum Power Point Tracking

  10. Generated Solar Power

  11. MPPT Operation Switching Supply Solar Panel Power Bus Pulse Width Control Max-voltage Sense Tracking Algorithm

  12. Power System - Block Diagram SPV1040 +Z Panel Power Bus MPPT Battery Protection SPV1040 X,Y Panels MPPT (x2) SPV1040 -Z Panel PIC I2C Interface Battery 3 x NiCd MPPT

  13. Power System - Battery • 3 x NiCad cells • 3.6 V nominal • 10 watt-hours • 10% depth of discharge • Charge: 0 to +45 C • Discharge: -20 to +60 C

  14. DC Power Available • 1.9 watts min in sunlight (no battery) • 2.2 watts average (max eclipse) • 2.8 watts average (no eclipse) • 10 watts peak power

  15. Internal Housekeeping Unit • Collects telemetry information • Supports science experiment • Sends telemetry as low speed FSK w/FEC in transponder mode • High speed FSK w/FEC in command mode • Executes commands from ground control

  16. IHU Block Diagram

  17. IHU Microcontroller • STMicroelectronics STM32L151VBT6 • ARM3 Cortex CPU (32-bit) • Up to 33 MIPS @32 MHz • Designed for "ultra" low power consumption • 128K FLASH program memory • 16K RAM • On board RTC, D/A, A/D

  18. IHU Non-volatile FRAM Memory

  19. RF System • 70 cm FM receiver (uplink) • 2 m FM Transmitter (downlink) • Transponder mode provides FM repeater • Command mode for running experiment

  20. FM Transmitter Transponder Mode CTCSS Decoder 2-minute Timer PTT 70 cm Antenna 2 m Antenna FM Receiver Audio IHU Commands Low Speed FSK

  21. FM Transmitter Command Mode 70 cm Antenna 2 m Antenna FM Receiver IHU Commands FSK Experiment

  22. RF System Design

  23. RF Power Amp

  24. Antennas 2 meter whip 70 cm whip

  25. VHF Antenna Pattern

  26. 2.0 1.5 SWR 1.1 1.0 VHF Antenna SWR

  27. UHF Antenna Pattern

  28. 2.0 1.5 SWR 1.1 1.0 UHF Antenna SWR

  29. Science Experiment • Penn State University - senior design project • 3-axis MEMs gyro sensor • Measures satellite spin rate, spin direction and wobble about the magnetic axis in orbit • May include GPS receiver

  30. Fox-1 Team Developers Advisors Logo by Steve Kenwolf

  31. Sound Like Fun? • AMSAT is always hiring! • Engineering: mechanical, electrical, systems, software, project management • Satellite construction: PCB layout, parts procurement, surface mount construction, parts machining, testing Contact Tony Monteiro, aa2tx@amsat.org

  32. Any Questions? AMSAT Engineering Team 2011 Space Symposium

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