Traffic Alert based on CPA (Closest Point of Approach)

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Traffic Alert based on CPA (Closest Point of Approach)

5/8/2020 3:01 PM

Paul Dirschka

Joined: 6/4/2019

Posts: 5

Re: Traffic Alert based on CPA (Closest Point of Approach)

I just completed 2 night flights and found the Traffic Radar to be a very effective aid. I particularly like the popup feature that makes it clear that something has changed and draws my attention to the display when nearby traffic is detected, but otherwise leaves the display uncluttered.

5/14/2020 10:53 AM

Don Maxwell

Joined: 1/13/2015

Posts: 1131

Re: Traffic Alert based on CPA (Closest Point of Approach) Modified By Don Maxwell on 5/14/2020 10:55:47 AM

Paul Dirschka wrote:

I just completed 2 night flights and found the Traffic Radar to be a very effective aid. I particularly like the popup feature that makes it clear that something has changed and draws my attention to the display when nearby traffic is detected, but otherwise leaves the display uncluttered.

Yes, I like the Traffic popup, too. That black square doesn't look like anything else in iFly, so it really gets my attention (usually).

Is there also an audio alert, such as "Traffic two o'clock high"? (I haven't been able to use the 740's audio in flight yet because it effectively mutes three other devices that are more important to me. Working to fix that, though, and hope to have it soon.)

5/14/2020 11:38 AM

Don Ellington

Joined: 7/24/2014

Posts: 22

Re: Traffic Alert based on CPA (Closest Point of Approach) Modified By Don Ellington on 5/14/2020 11:40:05 AM

Being an ATC at one of the airports where ASDE-X is installed I believe its principals are what we the OP is looking for,.

The ASDE-X system is a prediction system. It alerts on the prediction of a colission within the bounds of a runway. An aircraft approaching an intersection that is slowing while an aircraft is landing is not enough to generate an alert. The 2 aircraft have to be predicted to be at the same place in time.

As an example:
An aircraft on a 1 mile final with an aircraft crossing down field already past the centerline and not slowing will not be in conflict with the landing A/C.

To even drive the prediction aspect firther. There was an incedent where a ramp vehical was crossing the runway(without ATC permission) 7000' down the runway as a 737 was crossing the threshold and the ASDE-X didn't alert. The software never predicted a colission.

So to the idea of an aircraft behind you not being a factor... This would depend on speed. This is a valid method to limit alerts and make the system more of an "OMG WTF!!!" system then the boy who cries wolf.

With that said... The math is going to be fun!!!

Thanks
Delta Echo

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Traffic Alert based on CPA (Closest Point of Approach)

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