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- About btrakr
-
- btrakr runs on the Amiga computer, and given appropriate input
- information, will attempt to predict the landing location of a
- weather-balloon type package. Such a package is flown by Amateur
- Radio balloonists, with various kinds of radio gear, experiments,
- and photographic equipment on board. The package is lifted by
- a rubber balloon of the type used to fly the dozens of weather
- balloons sent up by the National Weather Service in the USA
- each day.
-
- The version of btrakr associated with this file is: 0.2
- A separate version of this program runs on MSDOS computers,
- and has the same functionality as does the Amiga version.
- Get in contact with the author if you need the MSDOS version.
-
- This version of btrakr will only work west of the zero meridian,
- and north of the equator. More specifically, I have not made the
- math work all over the world, only in North America. If you have
- the need to run btrakr elsewhere, let me know, and I will get to
- work on the changes.
-
- A Frequently Asked Questions file about Amateur Radio ballooning
- is on the World Wide Web. See:
- http://www.usa.com/~rickvg/pubs/faqloon.htm
-
- The program btrakr will accept upper air wind data from either the
- keyboard or from a file. To get an appropriate file, from the WWW,
- key in the URL:
- http://www-das.uwyo.edu/upperair/sounding.html
-
- You will need to grab the text version of the SKEW-T file
- appropriate for your balloon. A sample file is included with
- the btrakr archive. The only part of the file actually used
- is the wind data at the very beginning. The program needs that
- specific format to properly read data from a file. If you don't
- have the data in that format, use the keyboard. If you find
- wind data in a different text format, let me know and I can add
- a routine to the program specifically for that new type of wind
- data file. Note that wind speeds in the text file are specified
- in knots (nautical miles per hour) and altitudes are recorded in
- meters.
-
- When you start btrakr, you will have to key in your own launch
- coordinates, by latitude and longitude. The default coordinates
- are for a real launch location used by the Kansas Near Space Project,
- near Manhattan, Kansas. The KNSP URL is:
- http://www.ksu.edu/humec/knsp
-
- You may also change the default climb rate of the balloon, as well
- as the rate at which it descends on its parachute. The program allows
- you to change the expected altitude at which the balloon will burst.
- The highest balloon flight I have personally experienced (so far)
- is 111-thousand feet. The program allows burst altitudes of up to
- 150-thousand feet. The default burst altitude is 90-thousand.
-
- The output from btrakr starts with an estimate of the time in
- minutes for the balloon flight, from launch to touchdown, and then
- a predicted landing site coordinate pair, latitude and longitude,
- and a distance (range) from the launch site in miles, followed by
- a bearing from the launch site in degrees.
-
- As of this writing, I have had the opportunity to test the program
- with only one real flight. The program predicts the landing location
- of the 07 June 1997 KNSP flight within about six miles of where it
- actually landed, which seems *very* good for a first effort. Some of
- the math routines in the program are, at best, suspect. I don't fudge
- calculations, but I do some really simple calcuations when more
- complicated math might be appropriate. I need more data for testing.
- If you have balloon data, I would like to see it. I need the
- latitude and longitude of the launch and landing points, and the
- wind data from the nearest weather service site at the time nearest
- your balloon launch. That will usually be the data for 1200 Z.
- Please send such data to:
- bobdavis@cadvantage.com
-
- The files you will find in this archive are:
- btrakr (the balloon prediction program)
- btrakr.info (the associated .info file)
- btrakr.text (this text file about the program)
- top1200_07 (the upper air wind text file from
- Topeka, Kansas at 1200Z on 07 June 1997)
- btrakr.readme (the readme file required for aminet)
-
- This program is EMAILWARE. If you use it, please send to me
- an email and feel free to include comments or suggestions.
-
- bobdavis@cadvantage.com
-