[특허]Communicating information by radio

Communicating information by radio 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G08G-001/00
출원번호	US-0575113 (1990-08-30)
우선권정보	GB-0019950 (1989-09-04)
발명자 / 주소	Dadds Alan F. (Hartfield GB2) Holford Kenneth (Crawley GB2) Nugent David M. (Bugbrooke GB2) Stocker Brian J. (South Croydon GB2)
출원인 / 주소	U.S. Philips Corporation (New York NY 02)
인용정보	피인용 횟수 : 48 인용 특허 : 0

초록 ▼

Information is communicated by microwave radio between transponders (9,10) carried by vehicles (7,8) travelling on a road (1) and a station (22) adjacent the road. The communications from the transponders are effected by the transponders suitably modulating their reflections of beams of microwave energy transmitted by the station from aerials (B) mounted on a gantry (11) above the road, these aerials irradiating respective communication areas (28,29,30). In order to prevent communications from different transponders overlapping and hence interfering with each other the transponders are enabled for their communications by microwave energy from further aerials (A), which energy has a higher frequency to enable it to be beamed at relatively small respective activation areas (23-27) the sizes of which are such that they can each only contain one vehicle and hence one transponder at any given time. The further aerials are activated, one at a time, successively and cyclically, so that the transponders are necessarily enabled in succession, the activation rate being, moreover, sufficient to ensure that all transponders passing through the relevant stretch of road are in fact enabled. During each interval between the activation of each further aerial and the next the station transmits a command from the aerial(s) (B) associated with the further aerial (A) which has just been activated ordering any transponder which has just been enabled to communicate its presence. If it receives such a communication the station transmits an address code from the relevant aerial(s) (B) which is stored in the relevant transponder and used subsequently to selectively address that transponder for further communication.

대표청구항 ▼

A fixed station for communicating with mobile transponders traveling along a path, comprising: first means for irradiating a first portion of a path with a first beam of microwave energy at a first frequency, said first portion being sufficiently small that only one transponder is irradiated at one time, second means for irradiating a second portion of said path with a second beam of microwave energy at a second frequency, and means for controlling said first means to transmit said first beam for a first given period of time, and for controlling said second means to modulate said second beam for a period of time after said first given period of time, characterized in that said second frequency is lower than said first frequency, said second portion overlaps said first portion, and said station further comprises means for communicating a specific address code between said transponder and said station, and means, using said specific address code to address said transponder, for modulating said second beam to communicate further information to said transponder.

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