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Stratobuoy III

Stratobuoy III. Montana State University Matthew Handley Riley Logan Jordan Maxwell Matt Voll. Mission Overview:. - Verify the data link between the payload and ground station in a highly dynamic envionment

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Stratobuoy III

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  1. Stratobuoy III Montana State University Matthew Handley Riley Logan Jordan Maxwell Matt Voll SHOT II Workshop, Boulder, CO

  2. Mission Overview: • - Verify the data link between the payload and ground station in a highly dynamic envionment • Test all interfaces remotely (LVDS, UART, SPI etc.) and store payload data and telemetry beacons on-board • No RF communications yet • Analyze data post-flight using GSE software • Look for bugs in flight software or electrical interfaces that cause a system reset or missed beacons SHOT II Workshop, Boulder, CO

  3. SHOT II / UN-7 Connection: • Use SHOT balloon flight as test bed to confirm essential UN-7 mission interfaces • Payload CDH • CDH Data Storage • System Health Telemetry Beacon • Current Spacebuoy flight software version used • Current electrical interfaces and payload emulator SHOT II Workshop, Boulder, CO

  4. SHOT II Design: System Diagram SHOT II Workshop, Boulder, CO 4

  5. SHOT II Design: Mechanical • Foam box construction used in previous SHOT and Borealis (MSGC) balloon flights • Foil shielding for thermal regulation and EMI protection • Total mass: 1.2 kg SHOT II Workshop, Boulder, CO

  6. SHOT II Design: Electrical • Two Microchip PIC24 development boards configured as “emulators”: • 1) CDH emulator runs simplified flight software • 2) Payload sends dummy science data packets • Custom battery charger and flight switch circuit • 2-cell Li-Ion battery (same model used for Spacebuoy EPS) • Current Multi-Function Interface Board (MFIB) electronics used for payload interface • Separate heater circuit next to Li-Ion batteries SHOT II Workshop, Boulder, CO 6

  7. SHOT II Design: Software • Payload emulator demonstrates a science run, sends dummy data packet every 1 second • CDH collects dummy science data and writes to on-board SD card for future downlink • CDH reads system health data and “transmits” telemetry beacon every 10 seconds • GSE software used to track system health (voltages, currents, temperatures) over duration of the flight SHOT II Workshop, Boulder, CO 7

  8. SHOT II Test Details: SHOT II Workshop, Boulder, CO

  9. SHOT II Test Details: • MFIB and PIC24 development boards already used in functional testing for Spacebuoy electronics • Battery charge circuit tested to verify mission lifetime goals • Mission simulation data loaded from SD card into GSE software to demonstrate data parsing and analysis • Structure design tested with flight heritage SHOT II Workshop, Boulder, CO 9

  10. Expected Results: • Confirm payload data and beacon timing with the system clock information stored in each packet • Payload data increments with each packet sent, no packets missed • Track battery voltage and current over flight: • 1) No large fluctuations in current • 2) <20% battery depth-of-discharge • Monitor 3.3V line regulation • Produce time-series plots with GSE software SHOT II Workshop, Boulder, CO

  11. Demonstration: • Power switches • GSE software SHOT II Workshop, Boulder, CO

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