Acquisition system for continuous-wave frequency modulation obje

Details Acquisition system for continuous-wave frequency modulation obje Acquisition system for continuous-wave frequency modulation obje

1978-05-15

1980-04-29

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 902

Patent

active

042008719

ABSTRACT:
A continuous-wave frequency-modulation active radiometric target seeking device performs search, acquisition, and tracking functions. A technique is provided for target range discrimination and recognition using a pair of narrow band i.f. filters also improving both signal-to-clutter ratio and signal-to-receiver noise ratio. Target search is accomplished with simultaneous and synchronized range and antenna azimuth scanning with range bins effectively swept across the target by variably modulating the transmitted carrier frequency. Recognition of a substantially point target is achieved by a bipolar pulse discriminator responsive to the i.f. filter pair. Upon target acquisition, tracking is maintained by imposing a high frequency dither upon the modulation frequency in a closed loop control using only a single i.f. filter.

REFERENCES:
patent: 2508400 (1950-05-01), Kiebert, Jr.
patent: 2553907 (1951-05-01), Fleming-Williams et al.
patent: 2605418 (1952-07-01), Grass
patent: 2698932 (1955-01-01), Wathen
patent: 2724825 (1955-11-01), Davenport
patent: 2929057 (1960-03-01), Green
patent: 3500403 (1970-03-01), Fuller
patent: 3828348 (1974-08-01), Murray, Jr.
patent: 3921169 (1975-11-01), Lazarchik et al.
patent: 4107679 (1978-08-01), Strauch et al.

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