HA1LHigh Altitude 1U Laboratory

University of Michigan

Tom Heine

Ted Lorts

Hrishikesh Shelar1

Mission Overview

The central avionics of CADRE are included on HA1L and will demonstrate the following capabilities:

•Software modes

•Sensor and health checkouts

•Solar cells charging batteries

•UHF commanding and file transfer

•Beaconing and GPS tracking

•Watchdog-triggered reset

•Post-processed attitude determination

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Mission Expectations

Expectations at Launch:

•Receive beacons every 10sec

•Command heartbeat and file downlink

•Demonstrate autonomous reset in the absence of heartbeat

•Demonstrate charging of batteries from solar panels

•Operate CDH, EPS, and COM systems entire flight

•Maintain internal (aluminum), external (foam), and antenna structural integrity entire flight

Known Issues at Launch:

•No GPS fix (discovered Friday night…)

•No ADCS FPGA

•No board telemetry points (temperature, voltages) 3

Mission Performance

Actual Operation:

•Receive beacons every 10sec ✔

•Command heartbeat and file downlink ✖

•Demonstrate autonomous reset in the absence of heartbeat ✔

•Demonstrate charging of batteries from solar panels ✔

•Operate CDH, Battery, and Com systems entire flight ✔

•Maintain internal (aluminum), external (foam), and antenna structural integrity entire flight ✔

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Mission Results Mission Ops

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• Beacons received every 10 sec with 89.8% packet receipt by ground station.

• Observed two autonomous resets by the watchdog timer in telemetry beacon (triggered by actual FCPU errors).

• FCPU, power system, and radio beacon operated the entire flight.

• Ground system was unable to command the flight payload. Potential causes:

• Ground system transmitter was not powerful enough.

• Never accounted for effect of noise from board stack inside aluminum enclosure (modeled enclosure only).

• Possibly mis-interpreted “chase test” results

Mission Results Battery Charging

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Analysis Assumptions:•Same power load during testing and operation•Battery discharge profile is linear over this time period

Mission Results Communication

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Mission Results Communication

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Mission Results Structural Integrity

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Solar Panels in great shape!Solar Panels in great shape!

Antenna holding strong!Antenna holding strong!

Mission Results Structural Integrity

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Lost top clipLost top clip

OUCH!OUCH!

Now the good stuff…

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Now the good stuff…

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Thank you AFRL and COSGC!

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