Circuit for speed measurement of vehicles according to the Doppl

Details Circuit for speed measurement of vehicles according to the Doppl Circuit for speed measurement of vehicles according to the Doppl

1978-02-02

1979-10-23

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 944

Patent

active

041722566

ABSTRACT:
A circuit for speed measurement of vehicles according to the Doppler-radar principle wherein a Doppler-useful signal is evaluated in a computer to which such signal is infed by means of a threshold value switch. A single sideband modulator is provided, at the input side of which there is supplied the Doppler-useful signal and also a high-frequency signal produced by a high-frequency oscillator. The output side of the single-sideband modulator is connected with the input of a phase-locked loop, the output signal of which is converted into the original frequency band of the Doppler signal by means of a demodulator connected at its output side with the input of the threshold value switch.

REFERENCES:
patent: 3787853 (1974-01-01), Brookner
patent: 4101890 (1978-07-01), Goyard

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