AVSIG: Tracon Radar Snafu? wwswsigarch.jpg (7236 bytes)

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AVSIG Discussion Sections >> Air Traffic Control

B. Butler (Oregonian)
Top Gun


Reged: 05/15/04
Posts: 9760
Loc: Ashland, Oregon
Re: Tracon Radar Snafu?
      12/19/17 04:49 PM

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.

--------------------
"Why not be a nihilist? A man has to believe in something."
-Bernie Gunther

Edited by B. Butler (Oregonian) (12/19/17 04:51 PM)

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Entire topic
Subject Posted by Posted on
* Tracon Radar Snafu? Scott Dyer [HPN/NY] 12/19/17 01:38 PM
. * * Re: Tracon Radar Snafu? B. Butler (Oregonian)   12/19/17 01:45 PM
. * * Re: Tracon Radar Snafu? Scott Dyer [HPN/NY]   12/19/17 01:55 PM
. * * Re: Tracon Radar Snafu? Jeff Hartmann CIC   12/19/17 04:11 PM
. * * Re: Tracon Radar Snafu? Scott Dyer [HPN/NY]   12/19/17 08:07 PM
. * * Re: Tracon Radar Snafu? Jeff Hartmann CIC   12/19/17 11:19 PM
. * * Re: Tracon Radar Snafu? B. Butler (Oregonian)   12/19/17 04:49 PM
. * * Re: Tracon Radar Snafu? Scott Dunham (RDU)   12/19/17 06:32 PM
. * * Re: Tracon Radar Snafu? Russell Holton   12/19/17 02:33 PM
. * * Re: Tracon Radar Snafu? Scott Dyer [HPN/NY]   12/19/17 08:06 PM
. * * Re: Tracon Radar Snafu? Bill Bridges - 9S1   12/19/17 01:51 PM
. * * Re: Tracon Radar Snafu? B. Butler (Oregonian)   12/19/17 02:57 PM
. * * Re: Tracon Radar Snafu? Bill Bridges - 9S1   12/19/17 05:01 PM

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