Communications: directive radio wave systems and devices (e.g. – With particular circuit – Digital processing
Patent
1993-08-28
1994-08-30
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
Digital processing
364726, G01S 7295, G06F 15332
Patent
active
053432088
ABSTRACT:
An FFT-like array architecture (500), for use on the Doppler filters of a radar system, includes a plurality of stages (505, 506) of weighted butterflies (501, 502, 503, 504), in which each butterfly is provided with four weighting multipliers (410-416). The weights (W1, W2, W3, W4) of the multipliers of the array are determined by an iterative process in which the input and output signals are selected, the input signals are applied to the array, and the actual output signals are compared with the desired output signals to produce error signals. The error signals are backpropagated through the array, to correct the weights. The input signals are again applied, and the corrected output signals are again compared with the desired output signals to produce new error signals, which are again backpropagated to correct the weights. This procedure is used iteratively until the array "learns" the weights which give the desired output signals. In a radar context, narrower Doppler filters and lower sidelobe result over a given range of frequencies.
REFERENCES:
patent: 3783258 (1974-01-01), Chwastyk
patent: 4075630 (1978-02-01), Shapiro et al.
patent: 4622552 (1986-11-01), Andrews et al.
patent: 4680589 (1987-07-01), Bryant et al.
patent: 4689762 (1987-08-01), Thibodeau, Jr.
Barron Jr. Gilberto
Martin Marietta Corporation
Meise W. H.
Nieves C. A.
Young S. A.
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