Method of tracking target in presence of clutter

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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343 171R, G01S 746, G01S 1304

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active

045595372

ABSTRACT:
A method of operating a Doppler radar to track a target when main beam clutter is present is shown to comprise the steps of: (a) forming, from all signals exceeding a predetermined amplitude that are received by the pulse Doppler radar during a predetermined period, a range/Doppler matrix having NXM cells, where N is the number of range bins and M is the number of Doppler bins, with a digital one in any cell representative of a return signal with a given Doppler shift frequency from a reflector at a given range; (b) sequentially reading, in accordance with a predetermined program, the contents of the cells in the range/Doppler matrix to form digital numbers with digits indicative of the presence or absence of a reflector in adjacent cells; (c) comparing each digital number to a digital number representative of a target return signal; and (d) generating a frequency control signal when the comparison step indicates a target return signal to adjust a local oscillator in the pulse Doppler radar to effect tracking on the indicated target return signal.

REFERENCES:
patent: 3707718 (1972-12-01), Ames
patent: 3836964 (1974-09-01), Evans
patent: 4062012 (1977-12-01), Colbert et al.
patent: 4104631 (1978-08-01), Weigle
patent: 4119966 (1978-10-01), Bouvier et al.
patent: 4217583 (1980-08-01), Hiller et al.
patent: 4450446 (1984-05-01), Clancy et al.

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