Recently I published a story on a High Altitude Balloon (HAB) flight I help with for my friend Andy from Melbourne. I was asked about the data collected.
The flight data was only stored from transmissions from the Payloads on the balloon. The payload did not carry a recording device for such data. There were two sets of data returned. RTTY on UHF frequencies and HAM radio APRS. APRS relies, like RTTY, on a number of stations picking up the transmissions and sending the resulting data to the network for storage and display (maps) on a server via the Internet.
Simply this post is to display the data collected and help decode the data. I have not cleaned up the results. They are simply in Text and Word (Docx) format.
Sorry about the formatting in the above file. I will try and fix that shortly, but it does not matter. The formatting is only in the legend for the data.
This from the data file:
This is the breakdown of the raw HAM Radio APRS data strings. I have chosen the first line of APRS data as an example:
Server Date 2014-02-08
Server Time 00:43:06 UTC
Beacon TX time 004300h (time of transmission from the payload)
Latitude and Longitude 3532.44S/14456.90E
Course O052/ Note “O” + course in degrees “052”
Speed 000/ knots
Altitude A=000314 feet above sea level
Packet number 143 – starts at “1” with the first packet of data and increases with each packet.
After this point, the data strings are determined by the user / builder of the tracking unit and spaced by commas. This unit is configured with the following:
Number of satellites 9
GPS lock (3D) 3
Navigation Mode 6 Will work over 60,000 feet
Not used 0.0,0.0,
Volts (mV) of Battery 3296 Note, the battery voltage falls over time and with temperature. The voltage increases as the battery warms before landing
The first few APRS packets of data transmitted every 36 seconds by the tracker:
2014-02-08 00:43:06 UTC: VK3YT-11>APRS,WIDE1-1,WIDE2-1,qAR,VK3YT-7:/004300h3532.44S/14456.90EO052/000/A=000314,143,9,3,6,0.0,0.0,3296
2014-02-08 00:43:42 UTC: VK3YT-11>APRS,WIDE1-1,WIDE2-1,qAR,VK3YT-7:/004336h3532.44S/14456.90EO052/000/A=000318,144,10,3,6,0.0,0.0,3296
2014-02-08 00:44:18 UTC: VK3YT-11>APRS,WIDE1-1,WIDE2-1,qAR,VK3YT-7:/004412h3532.44S/14456.90EO052/000/A=000318,145,9,3,6,0.0,0.0,3296
2014-02-08 00:44:54 UTC: VK3YT-11>APRS,WIDE1-1,WIDE2-1,qAR,VK3YT-7:/004448h3532.44S/14456.90EO052/000/A=000318,146,9,3,6,0.0,0.0,3296
2014-02-08 00:45:30 UTC: VK3YT-11>APRS,WIDE1-1,WIDE2-1,qAR,VK3YT-7:/004524h3532.44S/14456.90EO052/000/A=000318,147,9,3,6,0.0,0.0,3296 (launch)