Detector with variance sensitivity

Details Detector with variance sensitivity Detector with variance sensitivity

1983-04-08

1984-12-18

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5CF, 367 98, G01S 730, G01S 1302

Patent

active

044893191

ABSTRACT:
In a radar or sonar system wherein the detection of a target is to be accomplished with a constant false alarm rate (CFAR), a circuit is provided for adjusting the input to a comparator which compares the received echo signals against the value of a threshold in order to detect targets of interest. The mean value of the background noise is subtracted from the signal, and the resulting difference is divided by the square root of the variance of background noise. The use of the variance compensates for sweep-to-sweep correlation and non-stationarity (in the statistical sense) as is found in clutter so that the clutter, upon the customary sweep-to-sweep integration of the signal, does not tend to introduce a false echo.

REFERENCES:
patent: 2842761 (1958-07-01), Downs
patent: 3946382 (1976-03-01), Kossiakoff et al.
patent: 3968490 (1976-07-01), Gostin
patent: 3995270 (1976-11-01), Perry et al.
patent: 4031364 (1977-06-01), Wilmot
patent: 4047172 (1977-09-01), Bauer et al.
patent: 4074264 (1978-02-01), Wilmot
patent: 4148025 (1979-04-01), Seiersen
patent: 4213127 (1980-07-01), Cole
patent: 4249177 (1981-02-01), Chen

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