FM-CW Radar distance measuring apparatus

Details FM-CW Radar distance measuring apparatus FM-CW Radar distance measuring apparatus

1979-11-15

1981-06-30

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 14, G01S 1332

Patent

active

042765498

ABSTRACT:
A FM-CW radar distance measuring apparatus, comprising a feedback loop having a high-frequency signal generator, a mixer device producing a beat signal between the transmitted wave and the received wave, a frequency discriminator, an integrator and a modulator which produces a sawtooth voltage for controlling the generator. The duration of the sawtooth is directly proportional to the distance to be measured. To improve the linearity of the signal to be transmitted a second (digital) feedback loop is provided, connected between the discriminator output and the modulator input and comprising the cascade arrangement of a threshold device, an adder, a store (and a digital-to-analog) converter. A distribution element connects the modulator to the store.

REFERENCES:
patent: 2928085 (1960-03-01), Katz
patent: 4107679 (1978-08-01), Strauch et al.
patent: 4151525 (1979-04-01), Strauch et al.

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