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CFAR Detection
Richards — Constant False Alarm Rate Detectors
CFAR Type
CA-CFAR (Cell Averaging)
GO-CFAR (Greatest Of)
SO-CFAR (Smallest Of)
OS-CFAR (Ordered Statistic)
CFAR Parameters
Reference Cells (each side)
16
Guard Cells (each side)
4
P
fa
(log
10
)
-4
OS rank k
24
Scenario
Number of targets
3
Clutter Edge?
No Clutter Edge
Step Clutter (+15 dB)
Sloped Clutter
Noise floor (dB)
0
Regenerate Scene
Results
Targets present
—
Detections
—
False alarms
—
Threshold factor α
—
CA-CFAR Threshold
T = α · (1/2N) Σ x
ref
α = N(P
fa
-1/N
- 1)
GO-CFAR:
max(lead,lag) — good for clutter edges
SO-CFAR:
min(lead,lag) — good for close targets
OS-CFAR:
k-th sorted value — robust to outliers