Stratobuoy III

Friday, June 29, 2012 SHOT II Workshop, Boulder, CO

Stratobuoy III

Montana State University

Matthew Handley

Riley Logan

Jordan Maxwell

Matt Voll

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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

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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

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SHOT II Design: System Diagram

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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

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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 batteries6


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

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SHOT II Test Details:

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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

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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

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Demonstration:

- Power switches

- GSE software

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Stratobuoy III

Documents

Transcript of Stratobuoy III