Aviation > Pilot/Controller Forum

Mode-S ADS-B

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BMT:
How will Mode-S help ATC??

BMT

pgarside:
Mode S tansponders offer everything that Mode C transponders are capable of with the addition of offering ACAS II.  Thus, it doesnt necessarily give the controler any extra information to work with, but could help eliminate mid-air collisions.

Many G1000 equiped airplanes now come with Mode S.  On the multifunction display I can see up to I believe 8 airplanes within about 5 miles.  It gives a good idea of what direction the plane is traveling as well as altitude in relation to my airplane.

goowe:
I don't know much about this technology, but I do have a picture from the ADS-B panel in the planes our school flies...

http://www.facebook.com/photo.php?pid=30103766&l=17e00&id=1411492282

This was taken in a C172 on approach to 7L at KDAB (Daytona Beach Intl) with two airplanes (the triangles) in front of us and a whole bunch on the ground. A few minutes earlier you could see all of the aircraft (four or five!) on final in front of us... it was very neat to watch the controller vector traffic from the airplane's ADS-B display...

pgarside:
The only thing is that there shouldnt be any planes on the ground being displayed.  The system works by basically 'stealing' the information from a radar facility.  Therefore, it would not be able to pick up any planes on the ground as they would not be visible to the radar facility.  I believe it is rated to work above 500 AGL, even though radar would pick up airplanes below that. 

Very cool though to see the planes lined up for final, I have never seen that from the airplane before.

goowe:
"ADS-B uses satellite navigation and datalink to enable an aircraft to broadcast its identification, position, altitude, velocity, and intent to every other aircraft in the vicinity as well as to the ground tracking system. This broadcast information may be received and processed by other aircraft or ground systems for use in improved situational awareness..."
Commercial Aviation Safety, Fourth Edition

I don't think the ADS-B steals any information :-\

I know we've been taxiing on the ground before, with the ADS-B display zoomed in and you can see all other aircraft currently squawking on the ground.

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