1. HA1L High Altitude 1U Laboratory
University of Michigan
Tom Heine
Ted Lorts
Hrishikesh Shelar

2. 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

3. 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)

4. 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 ✔

5. Mission Results Mission Ops
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

6. Mission Results Battery Charging
Analysis Assumptions:
Same power load during testing and operation
Battery discharge profile is linear over this time period

7. Mission Results Communication

8. Mission Results Communication

9. Mission Results Structural Integrity
Solar Panels in great shape!
Antenna holding strong!

10. Mission Results Structural Integrity
Lost top clip
OUCH!

11. Now the good stuff…

13. Now the good stuff…

14. Thank you AFRL and COSGC!