Vehicle detecting method and system which can communicate with v

Details Vehicle detecting method and system which can communicate with v Vehicle detecting method and system which can communicate with v

1986-04-21

1990-04-24

Orsino, Joseph A.

Communications: electrical

External condition vehicle-mounted indicator or alarm

Highway information

340933, 340939, 340941, G08G 109

Patent

active

049203401

ABSTRACT:
A vehicle detecting system detects the existence of a vehicle on a roadway and communicates therewith in the following manner. A pair of transmitting and receiving coils are arranged on both sides of a detection area set over the roadway of the vehicle. The first high frequency signal of the first frequency is applied to the transmitting coil to form the high frequency magnetic field between those coils. The existence of the vehicle is detected on the basis of the point such that the characteristic such as level or phase of the signal induced in the receiving coil changes due to the vehicle which entered the magnetic field. The first high frequency signal which is applied to the transmitting coil is modulated by the data to be transmitted to the vehicle. Or, the second high frequency signal which has the second frequency different form the first frequency of the first signal and is transmitted from the vehicle is received by the receiving coil and demodulated.

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