Ranging radar including a modulating reflector

Details Ranging radar including a modulating reflector Ranging radar including a modulating reflector

1979-12-19

1981-12-15

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 1332

Patent

active

043062369

ABSTRACT:
A ranging radar of the radio frequency (RF) frequency modulated-continuous wave (FM-CW) type transmits an RF FM-CW signal to a reflecting surface at an unknown range R from the radar. The reflecting surface reflects the signal to a modulating device. The modulating device further modulates the signal at a frequency F which is high in comparison to the modulating frequency of the FM-CW signal. The further modulated signal is transmitted by the device to the reflecting surface and back to the ranging radar where it is subtractively mixed with a sample of a transmitted signal. The mixed signal is at frequency F amplitude modulated by a beat frequency, the period of which corresponds to range R. The frequency F is removed from the mixed signal leaving the beat frequency signal from which is determined range R.

REFERENCES:
patent: 3522602 (1970-08-01), Ver Planck
patent: 4003049 (1977-01-01), Sterzer et al.

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