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| From: | Rick Parrish |
| Subject: | Re: [Discuss-gnuradio] Homing in on the mystery of Pulsy McGrooder |
| Date: | Mon, 11 Sep 2006 23:30:47 -0500 |
| User-agent: | Thunderbird 1.5.0.5 (Windows/20060719) |
*giggle*Marcus ... that's an aircraft transponder. Except for some vintage 1930's aircraft that don't have an electrical system - every plane / helicopter has one. Hit Google or Yahoo! for "Mode-C" and "Mode-S" transponder.
The ground radar "pings" the aircraft's transponder (interrogation). The transponder sends back a reply. Some replies carry a 12 bit ID code plus altitude. Others might have actual GPS coordinates.
-rick
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