Narrative:

I was working ar-V; the final for 26R atl. We've been using fusion on final for some time. Today; the lzu ASR feed is in ibi [interim beacon initiative] mode. We were getting a lot of aircraft within 10 miles of the airport jumping; identing; and seeing a lot of false primary targets (that would be there for less than 10 seconds; then disappear). I got aircraft X in the downwind; and told him 8-10 mile base. He hurried down. I had aircraft Y fed in the base (too fast; but they were training and it wasn't unworkable). I turned aircraft X from downwind to base to hit the gap and keep him tight behind his traffic. I waited and waited to see the turn; but didn't. When it was past time to do something; I told him to stop his turn if he hadn't started it. He said he was through a 150 heading. Just after he unkeyed; the tag jumped and showed him southbound. He was in the hole fine; I got aircraft Y to see the traffic and follow; and all was ok.I said something aloud; and the ar-a controller had been watching the whole thing. I commented something like; 'I must be crazy'; and she said; 'no; I was watching it; I saw the exact same thing'. She commented that she was watching it because it [would create a problem] if the aircraft wasn't turning (exactly why I made the transmission I did). We talked to the third final controller (ar-O); and we all agreed the presentation was unacceptable; and we advised the supervisor on the wall we were going to go to single sensor; atl ASR on all three final positions.when I got the briefing for the position; the controller on position said there were issues and he was seeing the same thing. He had a lot of histories on his tracks; and you could see them jumping up to .5 miles away from what appeared to be the track the aircraft was taking. I'm all for switching to fusion on final; but when the tags jump this much; it's unacceptable. The replay won't show anything because they look at it on a single sensor (atl); so it won't see the fused display I was seeing. Lzu was brought out of ibi mode as I write this and tech ops enabled the mode-south and then put the finals back on fusion.

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Original NASA ASRS Text

Title: A80 controllers report of using fusion radar on the final sectors. Controller turns an aircraft into a hole; the aircraft did not turn as the controller thought it would; then jumped showing it on a different then assigned heading.; The controller had visual separation so all was good separation wise; but didn't like the way the aircraft jumped. Controller exclaimed and another controller also saw what happened. Controller thought the jumping of radar targets on final is unacceptable.

Narrative: I was working AR-V; the final for 26R ATL. We've been using Fusion on final for some time. Today; the LZU ASR feed is in IBI [Interim Beacon Initiative] mode. We were getting a lot of aircraft within 10 miles of the airport jumping; identing; and seeing a lot of false primary targets (that would be there for less than 10 seconds; then disappear). I got Aircraft X in the downwind; and told him 8-10 mile base. He hurried down. I had Aircraft Y fed in the base (too fast; but they were training and it wasn't unworkable). I turned Aircraft X from downwind to base to hit the gap and keep him tight behind his traffic. I waited and waited to see the turn; but didn't. When it was past time to do something; I told him to stop his turn if he hadn't started it. He said he was through a 150 heading. Just after he unkeyed; the tag jumped and showed him southbound. He was in the hole fine; I got Aircraft Y to see the traffic and follow; and all was OK.I said something aloud; and the AR-A controller had been watching the whole thing. I commented something like; 'I must be crazy'; and she said; 'No; I was watching it; I saw the exact same thing'. She commented that she was watching it because it [would create a problem] if the aircraft wasn't turning (exactly why I made the transmission I did). We talked to the third final controller (AR-O); and we all agreed the presentation was unacceptable; and we advised the supervisor on the wall we were going to go to single sensor; ATL ASR on all three final positions.When I got the briefing for the position; the controller on position said there were issues and he was seeing the same thing. He had a lot of histories on his tracks; and you could see them jumping up to .5 miles away from what appeared to be the track the aircraft was taking. I'm all for switching to fusion on final; but when the tags jump this much; it's unacceptable. The replay won't show anything because they look at it on a single sensor (ATL); so it won't see the fused display I was seeing. LZU was brought out of IBI mode as I write this and Tech Ops enabled the Mode-S and then put the finals back on fusion.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.