B. Butler (Oregonian)
(Top Gun)
12/19/17 04:49 PM
Re: Tracon Radar Snafu?

Quote:

OK...I must have been in "coast".
Was the system predicting my position and not reporting it?
Pretty sure he said coast...




Yes. Thats what happens. The underlying radar gives real-time position, updated every 10 seconds (center radar) or 4 in terminal, but the computer that associates a data block with your transponder simultaneously predicts your next position based on track and speed history and if it doesn't see a radar target, it goes there anyway and announces "CST".

The computer is looking for your transponder in a fairly small circle of possibility and it is very easy to make a sharp turn, to join a course, for instance and sling the data block off on a tangent.

The system isnt hopelessly stupid though, and on each update it expands the circle of possibility, but there is an internal plausibility check it does, so you can CST for a while. It is precisely why every controller is supposedly taught to control the target, not THE FRAPPIN DATABLOCK!

Ahem...sorry.. I think the above fits your case.



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