Skylane 182/RG Turbo Skylane/RG
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 6.5
Confusion; Distraction; Human-Machine Interface; Situational Awareness; Troubleshooting; Workload
ATC Issue All Types; Deviation - Speed All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Other / Unknown
Air Traffic Control Provided Assistance; General Maintenance Action
ATC Equipment / Nav Facility / Buildings
We noticed a problem developing with our radar presentation. Targets were appearing and disappearing at various altitudes and speeds including targets we were working. Aircraft X showed a ground speed of 610 Knots at one point as well as target jumps greater than 1NM and rapid heading changes. I instructed the trainee to discontinue lateral separation until the problem could be resolved. Also; false targets appeared and disappeared but I couldn't be certain whether they were actually false or not. I advised the Controller In Charge who in turn advised Tech Ops.  The problem continued throughout the session.The radar presentation must be fixed.  We cannot use radar separation when radar identification is questionable.
Approach Controller reported that radar targets were showing rapid erroneous speed readouts and were jumping around the radar displaying false heading changes.