Communications: directive radio wave systems and devices (e.g. – Determining velocity – Combined with determining sense of motion
Patent
1995-01-12
1996-09-17
Pihulic, Daniel T.
Communications: directive radio wave systems and devices (e.g.,
Determining velocity
Combined with determining sense of motion
342115, G01S 1391
Patent
active
055572812
ABSTRACT:
A device for measuring the velocity of vehicles for traffic monitoring a doppler signal transmitter and receiver is used which comprises two mixer diodes arranged to deliver two doppler signals which are dephased against each other by 90.degree., the one or the other signal leading the other, depending on whether the picked up vehicle approaches or recedes from the doppler signal transmitter is fed into a frequency measuring device for measuring the signal frequency as a quantitative measure for the relative velocity between vehicle and doppler signal transmitter. For this purpose one signal of the doppler signal transmitter and receiver 10 is fed into a phase control circuit 34, the output frequency of which is converted into a voltage proportional to the relative velocity between doppler signal transmitter 10 and monitored vehicle. Furthermore, the two signals of the doppler signal transmitter and receiver are fed into a phase detector 26. The output signals of the phase detector circuit 26 are fed into a directional logic circuit 28 which has two logic outputs 30, 32 at which logic signals appear indicating as to whether the picked up vehicle approaches or recedes. The logic signals from the directional logic circuit 28 are fed into a frequency voltage converter 56. The frequency voltage converter 56 has two outputs 62, 64. A voltage proportional to the relative velocity of the picked up vehicle appears at output 62 when the picked up vehicle approaches. A voltage proportional the the relative velocity of the picked up vehicle appears at output 64 when the picked up vehicle deviates.
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Creighton Wray James
Pihulic Daniel T.
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