Small Aircraft; Low Wing; 1 Eng; Retractable Gear
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 6
Human-Machine Interface
ATC Issue All Types; Conflict Airborne Conflict; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance
General None Reported / Taken
Human Factors; ATC Equipment / Nav Facility / Buildings; Equipment / Tooling; Procedure
I was the radar controller sequencing multiple aircraft to the SNA ILS final. I cleared Aircraft X for an ILS approach at proper glide path altitude and intercept angle. Aircraft X was issued a speed control of 110 kts or faster for spacing. Aircraft initially went through the final and stated he was correcting. Aircraft then proceeded to over correct and turned almost opposite direction into Aircraft Y being sequenced behind on a right base.Fusion RADAR causes targets to jump around; especially for slow moving aircraft. This allows controllers to hesitate and observe if the track movement is false before taking action.
SCT TRACON Controller reported a loss of separation.  Controller reported FUSION Radar contributed to the inability to catch the error sooner.