Narrative:

Aircraft X was level at 090 and aircraft Y was climbing from 050 to 070; both in the same area. The conflict alert went off and I saw traffic in front of aircraft X indicating 090 and 20 KTS faster displaying a unique transponder code. I issued traffic to aircraft X who did not have the traffic in sight. The traffic seemed to disappear and reappear in different relative positions to aircraft X (12 o'clock; 3 o'clock; 9 o'clock) and the transponder codes were different each time. The codes being displayed were different from any other aircraft I was working including pending aircraft in my strip bay. Eventually the traffic disappeared and did not return. I was using fusion during the entire event.I think this is an issue with our surveillance system; but I don't know which component (stars; ASR; etc.).

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Original NASA ASRS Text

Title: DAB Controller reports of erroneous targets appearing in front of traffic being worked with different transponder codes at each hit of the radar.

Narrative: Aircraft X was level at 090 and Aircraft Y was climbing from 050 to 070; both in the same area. The Conflict Alert went off and I saw traffic in front of Aircraft X indicating 090 and 20 KTS faster displaying a unique transponder code. I issued traffic to Aircraft X who did not have the traffic in sight. The traffic seemed to disappear and reappear in different relative positions to Aircraft X (12 o'clock; 3 o'clock; 9 o'clock) and the transponder codes were different each time. The codes being displayed were different from any other aircraft I was working including pending aircraft in my strip bay. Eventually the traffic disappeared and did not return. I was using FUSION during the entire event.I think this is an issue with our surveillance system; but I don't know which component (STARS; ASR; etc.).

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.