Doppler radar sensor calibrator

Details Doppler radar sensor calibrator Doppler radar sensor calibrator

1974-04-08

1976-01-27

Hubler, Malcolm F.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 740

Patent

active

039355730

ABSTRACT:
An electronic calibrator for doppler radar speed sensors and odometers comprising a variable impedance device, such as a varactor, positioned in the near-field of the radar antenna to modulate the radar probe beam, in the calibrate mode of the radar at a rate corresponding to the frequency of a doppler signal that would be sensed by the radar in its operating mode at a given speed. The impedance during the calibration mode is excited by a separate a.c. signal at a frequency corresponding to the doppler signal frequency. The output of the radar provides an indication during the calibration mode that can be adjusted to a calibrated indication corresponding to the actual speed causing a doppler signal of the same frequency as the excitation signal for the impedance.

REFERENCES:
patent: 2836813 (1958-05-01), Flower et al.
patent: 3103010 (1963-09-01), Heyser et al.
patent: 3277477 (1966-10-01), Evans
patent: 3329953 (1967-07-01), Adams et al.
patent: 3331070 (1967-07-01), Sommers et al.
patent: 3573826 (1971-04-01), Fredericks

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