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    • 8. 发明授权
    • Method and apparatus for a portable communication device to identify its
own location
    • 用于便携式通信设备识别其自身位置的方法和装置
    • US5646632A
    • 1997-07-08
    • US338911
    • 1994-11-14
    • Muzibul H. KhanJoseph Boccuzzi
    • Muzibul H. KhanJoseph Boccuzzi
    • G01S5/06G01S5/10H01Q3/22H04W64/00
    • H04W64/00G01S5/10H01Q3/22
    • A method and apparatus for a portable communication device, such as a mobile radio terminal in a CDMA network, to identify its geographic location. A communication network comprises multiple base stations which transmit pilot signals, where the pilot signals of one base station are offset from the pilot signals of other base stations by integral multiples of a substantially fixed duration. Associated sync channel messages are also transmitted from which the geographic location of the base stations may be extracted. A portable communication device identifies its location by calculating the delay between the arrival time of a pilot signal from a primary base station and the arrival times of pilot signals from at least two other base stations. For each pair of base stations corresponding to one of the calculated delays, the portable communication device initially specifies its location as being on a selected one of three curves. The current location of the portable communication device is identified based upon points of intersection of the selected curves. The identified location may be stored in, transmitted from, or displayed at the portable communication device.
    • 用于便携式通信设备(诸如CDMA网络中的移动无线电终端)的方法和装置来识别其地理位置。 通信网络包括发射导频信号的多个基站,其中一个基站的导频信号与基本上固定的持续时间的整数倍的其他基站的导频信号偏移。 还发送关联的同步信道消息,可从中提取基站的地理位置。 便携式通信设备通过计算来自主基站的导频信号的到达时间与来自至少两个其他基站的导频信号的到达时间之间的延迟来识别其位置。 对于对应于所计算的延迟之一的每对基站,便携式通信设备最初将其位置指定为在三条曲线中选定的一条曲线上。 基于所选择的曲线的交点,识别便携式通信设备的当前位置。 所识别的位置可以存储在便携式通信设备中,从便携式通信设备发送或显示。