Constant false alarm rate with low probability of false alarms

Details Constant false alarm rate with low probability of false alarms Constant false alarm rate with low probability of false alarms

1989-11-20

1991-08-06

Hellner, Mark

Communications: directive radio wave systems and devices (e.g.,

Return signal controls radar system

Receiver

342 91, 342159, G01S 728

Patent

active

050381458

ABSTRACT:
A constant false alarm rate (CFAR) circuit uses three windows for calculating mean level thresholds. In addition to a lead window and a lag window each separated from a cell of interest by a predetermined number of cells, a straddle window is used which includes the cell of interest. Each of the lead, lag and straddle windows are subjected to editing to remove three adjacent cells including the cell with the highest power level. The remaining cells are used to calculate a mean level threshold for each of the three windows. The largest of the three mean level thresholds is used, unless it is derived from the straddle window and it is significantly larger than the largest of the mean level thresholds derived from the lead and lag windows. In addition, use of the mean level threshold derived from the straddle window may be excluded for range cells associated with one or more range and azimuth.

REFERENCES:
patent: 4649394 (1987-03-01), Minker et al.
patent: 4749994 (1988-06-01), Taylor, Jr.

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