Doppler radar measuring apparatus

Details Doppler radar measuring apparatus Doppler radar measuring apparatus

1984-05-18

1986-01-28

Jordan, Charles T.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 5PD, G01S 1300, G01S 1326, G01S 1334

Patent

active

045674841

ABSTRACT:
Range-dependent sensitivity of an RF doppler radar apparatus is reduced to prevent false alarms when small objects move in close proximity to the apparatus' antenna. The sensitivity is reduced by periodically FM-modulating the transmitted RF signal at a frequency corresponding to a wavelength which is at least four times the operating range of the apparatus. The reflection of the transmitted signal is mixed with the transmitted signal to produce a difference frequency signal which is sampled at instants of maximum amplitude.

REFERENCES:
patent: 2236893 (1941-05-01), Chaffee
patent: 3132340 (1964-05-01), Galejs
patent: 3168735 (1965-02-01), Cartwright
patent: 3189899 (1965-06-01), Slater
patent: 3271755 (1966-09-01), Bagno
patent: 3581310 (1971-05-01), Buckley
patent: 3761908 (1973-09-01), Gehman
patent: 3796989 (1974-03-01), Ravas et al.
patent: 4035798 (1977-07-01), Hackett
patent: 4142189 (1979-02-01), Gleason
Skolnik, Radar Handbook, Sect. 16.10, pp. 16-21-28, McGraw Hill Books, 1970.

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