News helicopter telemetry decoding

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gariac

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Feb 1, 2004
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Every once in a while a youtube video is uploaded with telemetry on the audio track. This can be demodulated though every system is a little different.

For this chase:
miami chase on youtube
I have decoded this output that I have uploaded on pastebin
decoded output on pastebin
using this web page as an example
helicopter telem decoding

I am trying to pick out the position data. Here is a sample field:
AN 25 5195

BW 080 1920

C044

D083

E000841

K00002

L0438

l01201

Miami lat/lon is 25.830500 -80.180374. No obvious mapping is coming to mind but I figured I would do a post on the long shot someone sees a pattern, The pastebin has more data packets. The BW field never changes. I guess it is the L and l fields but the position data doesn't make sense.
 

gariac

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Joined
Feb 1, 2004
Messages
252
Perhaps this will be of help:
Yeah Windy Tan is the first link on that inplanesight.org page. She is quite the hacker if you look at the other things she has done.

Reading my own post at a more sane hour I just realized that the lat/lon is in the A and B fields. The B field isn't static looking at more of the data on pastebin.

AN 25 5195 is probably N25 51.95 . Now to do some scripting to make a tracking file.
 
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