PRC/FM CW Radar system

Details PRC/FM CW Radar system PRC/FM CW Radar system

1978-06-28

1980-12-23

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 14, 343 172PC, G01S 9233, G01S 924

Patent

active

042413478

ABSTRACT:
An FM-CW radar system with improved range discrimination and improved immunity to clutter, chaff, jamming and multiple target environments. The FM-CW apparatus involves a repetitive cycle including a first, constant-transmitted-frequency (monochromatic) transmission, a linear frequency upsweep as a second period and a linear frequency downsweep as a third period within each transmission frame. Pseudorandom coding is superimposed on the FM-CW waveform, a code word duration being selected to place the first Doppler ambiguity beyond the highest expected equivalent target velocity. The resulting range ambiguities are resolved by means of the unambiguous range-determining capability of the FM-CW feature.

REFERENCES:
patent: 3109172 (1963-10-01), Hardinger et al.
patent: 3188635 (1965-06-01), Blythe
patent: 3372391 (1968-03-01), Lerner
patent: 3824592 (1974-07-01), Mehltretter
patent: 3874296 (1975-04-01), Hedemark
patent: 4106018 (1978-08-01), Chihak et al.

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