1. University of Maryland DYMAFLEX SHOT II Post-Flight Presentation
July 1, 2012

2. Summary
Goal: Receive packets to analyze packet loss with the satellite link margin
Test preliminary satellite software and C&DH configuration
Began receiving packets immediately after power on of payload
Received packets for the duration of the flight, with some exceptions
Began recording packets with the ground station shortly after balloon released
Temperatures looked accurate throughout flight

3. Temperature Data

4. Packet Loss Analysis 207 total packets sent, recorded 129 packets
First 42 not recorded due to ground station setup delay
26 dropped during communications loss
3 dropped during anomalous behavior
7 other unexplained dropped packets
3.38% of packets dropped
Unable to determine accurate cause of anomalous packets drops due to lack of sensor data from the payload
Packet drops possibly caused by:
Low temperatures
Condensation
Neil Patrick Harris on a Unicorn (Pegasus?)

5. Flight Anomalies
Lost contact with payload during descent at ~24,000 ft
Contact regained at ~10,000 ft
Attempted to transmit command to payload
During this portion, could not record received packets, accounting for 2 dropped packets
Changed log files to make sure logging was correct, allowing a packet to be dropped
Temperature consistency
Temperature remained static at -5.84°C for some portions of flight
Repeated packet
Contained anomalous data: odd temperature data and static time stamp

6. Future Testing Input voltage monitoring Internal logging
Uplink commands
Fully tested ground station
Thermal protection on C&DH
9600 baud RF
Stream protocol testing

7. Any Questions?