Registers – Transfer mechanism – Traveling pawl
Patent
1975-11-10
1977-06-21
Ruggiero, Joseph F.
Registers
Transfer mechanism
Traveling pawl
23515113, 235156, 307358, 343 5DP, 358167, G06F 738, G01S 902
Patent
active
040313646
ABSTRACT:
An improved video clutter processor utilizing a multiple moment detector that provides a constant false alarm rate regardless of the probability distribution of the radar clutter. The processor provides an adaptive threshold that is a function of multiple moments to compensate for variation in parameter of a selected number of parameter probability distributors. In accordance with the invention either moments around the origin may be combined to establish the threshold or central moments may be combined for the threshold level. In one arrangement of the invention, digital delay lines store the quantized sample video and the second, third and fourth powers of the quantized video which are the mean values about the origin are estimated by dividing the sum of the quantized videos by a number equal to the number of combined values to provide the moments about the origin. The second, third and fourth moments about the mean which are the central moments are obtained by transform relations providing either the maximum likelihood method or substantially near to the maximum likelihood method. The threshold is then obtained by multiplying each of the central moments by multiplying factors K.sub.i and adding each of these factors plus a factor K.sub.o which corresponds to an offset term. Thus, the adaptive threshold T is a function of all the four moments and it is able to compensate for variations in the parameters of a single, double, triple or quadruple parameter probability distribution. The principles of the invention includes other arrangements for deriving the mean value and includes combining of any desired number of higher moments with the threshold determined from either the selected moments around the origin or the selected central moments.
REFERENCES:
patent: 3493874 (1970-02-01), Finkel et al.
patent: 3549877 (1970-12-01), Goldman
patent: 3755696 (1973-08-01), Nicolson et al.
patent: 3761922 (1973-09-01), Evans
patent: 3797014 (1974-05-01), Tompkins et al.
patent: 3838422 (1974-09-01), MacArthur et al.
Adam Walter J.
Hughes Aircraft Company
MacAllister W. H.
Ruggiero Joseph F.
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