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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0646706 (1991-01-28) |
| 발명자 / 주소 |
|
| 인용정보 | 피인용 횟수 : 478 인용 특허 : 0 |
A vehicle locating and navigating system operating in conjunction with a cellular telephone network is provided. A small, hidden device located in a vehicle is activated through DTMF signals transmitted from any telephone station. Upon activation, the device determines the power at which normally tr
A vehicle locating and navigating system operating in conjunction with a cellular telephone network is provided. A small, hidden device located in a vehicle is activated through DTMF signals transmitted from any telephone station. Upon activation, the device determines the power at which normally transmitted control channels are received from several base stations of the network. Based upon these determinations, the device then calculates the distance between the vehicle and each of the base stations and, using triangulation or arculation, determines the location of the vehicle. The locational information is transmitted through a voice synthesizer back to the telephone station from which the activation signal is received, or to a different telephone station dedicated to receive this information. The locational information also is transmitted digitally to a central station where the position of the vehicle is displayed on a computer screen along with a graphical representation of a map of the region served by the cellular telephone network. An operator at the central station can assist the vehicle\s operator with navigational information or provide tracking coordinates to a tracking vehicle equipped with a similar device.
A system for determining a vehicle\s location comprising: (a) receiving means for receiving signals transmitted from a plurality of base stations of a cellular telephone network; (b) first determining means for determining the received-power at which each of said signals is received; (c) second dete
A system for determining a vehicle\s location comprising: (a) receiving means for receiving signals transmitted from a plurality of base stations of a cellular telephone network; (b) first determining means for determining the received-power at which each of said signals is received; (c) second determining means for determining the location of each of said base stations from which each of said signals is transmitted, the transmitting power at which each signal is transmitted, and the signal-attenuation factor of each signal; (d) first calculating means for calculating the distance between said vehicle and each of said base stations as a function of the transmitting power, received-power, and signal-attenuation factor of each of said signals; (e) second calculating means for calculating the vehicle-location of said vehicle as a function of said distances and the location of each of said base stations; and (f) transmitting means for transmitting a signal identifying said vehicle-location.
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