ZFW controller reported that the operational error detection program (oedp) reported a loss of separ...

Narrative:

Aircraft X was instructed to cross dodje at 9;000 ft. Ground speed at time was 335 KTS and stayed constant in descent from FL220. However; when he reached 9;500 ft; his ground speed dropped drastically to 285 KTS in one sweep. Approach control called me and said they were not getting a good target to declare radar at that time; but should pick him up at dodje. They instructed me to keep him coming on the arrival. I noticed some target jumps prior to aircraft X approaching a BE20; which had a constant ground speed of 245 KTS until he started his descent from FL180. It increased to 265 KTS and stayed there until I turned him 30 degrees left as a precaution/prevention from losing 5 NM [separation]; 7 NM from dodje. The two aircraft were consistently 6 to 7 NM apart based on leader lines. I believe the target jumps caused the system to alert that separation was lost. Fix radar coverage in the donie low sector.

Original NASA ASRS Text

Title: ZFW controller reported that the Operational Error Detection Program (OEDP) reported a loss of separation between two aircraft. Reporter references jumping targets and poor radar coverage as contributory.

Narrative: Aircraft X was instructed to cross DODJE at 9;000 FT. Ground speed at time was 335 KTS and stayed constant in descent from FL220. However; when he reached 9;500 FT; his ground speed dropped drastically to 285 KTS in one sweep. Approach Control called me and said they were not getting a good target to declare radar at that time; but should pick him up at DODJE. They instructed me to keep him coming on the arrival. I noticed some target jumps prior to Aircraft X approaching a BE20; which had a constant ground speed of 245 KTS until he started his descent from FL180. It increased to 265 KTS and stayed there until I turned him 30 degrees left as a precaution/prevention from losing 5 NM [separation]; 7 NM from DODJE. The two aircraft were consistently 6 to 7 NM apart based on leader lines. I believe the target jumps caused the system to alert that separation was lost. Fix radar coverage in the Donie Low sector.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	981078
Time
Date	201111
Local Time Of Day	1801-2400
Place
Locale Reference	ZFW.ARTCC
State Reference	TX
Aircraft 1
Make Model Name	Citation V/Ultra/Encore (C560)
Operating Under FAR Part	Part 91
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	Super King Air 200
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Enroute
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

ZFW controller reported that the operational error detection program (oedp) reported a loss of separation between two aircraft. Reporter references jumping targets and poor radar coverage as contributory.