Communications: electrical – External condition vehicle-mounted indicator or alarm – Highway information
Patent
1998-11-30
2000-08-01
Lefkowitz, Edward
Communications: electrical
External condition vehicle-mounted indicator or alarm
Highway information
340933, 340939, G08G 109
Patent
active
060973129
ABSTRACT:
While transmitting an electromagnetic wave from a transmitting antenna to, for example, a magnetostrictive resonator, buried in a road, a reception section composed of a reception amplifier and signal processor is inactivated. After stopping transmission of the electromagnetic wave, the reception section is activated and a receiving antenna detects an electromagnetic wave radiated by the magnetostrictive resonator. In this method, a magnetostrictive resonator detection apparatus having a sufficient directivity and detection distance can be presented. The magnetostrictive resonator detection apparatus applying this detecting method is mounted aboard a vehicle, and a plurality of magnetostrictive resonators are buried in the road. By sequentially transmitting and receiving electromagnetic waves at different resonance frequencies thereof, and judging the configuration of the road and the vehicle, a safe traffic system is presented.
REFERENCES:
patent: 4067235 (1978-01-01), Markland et al.
patent: 5491475 (1996-02-01), Rouse et al.
patent: 5767766 (1998-06-01), Kwun
Tanji Yoshihiko
Yasui Keiji
Yoshioka Toshihiro
Lefkowitz Edward
Matsushita Electric - Industrial Co., Ltd.
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