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    • 99. 发明授权
      US06081229A System and method for determining the position of a wireless CDMA transceiver 失效
    • System and method for determining the position of a wireless CDMA transceiver
    • US06081229A
    • 2000-06-27
    • US40501
    • 1998-03-17
    • Samir S. Soliman , Klein S. Gilhousen
    • Samir S. Soliman , Klein S. Gilhousen
    • G01S19/03 , G01S1/00 , G01S5/00 , G01S5/02 , G01S5/14 , G01S19/09 , G01S19/12 , G01S19/23 , G01S19/25 , G01S19/46 , G04G7/02 , H04B7/15 , H04W64/00 , H04B7/185
    • G01S5/0205 , G01S19/235 , G01S19/25 , G01S19/46 , G01S5/0054 , G01S5/009 , G01S5/02 , G01S5/021 , G04G7/02 , H04W64/00 , G01S2205/008 , G01S5/0236
    • A system and method for determining a position of a mobile wireless transceiver. The inventive system merges GPS position location and wireless communication technologies to achieve a precise position location in dense urban and other environments when line-of-sight to the satellites is somewhat obscured. The inventive method uses signals from only two GPS satellites and the serving terrestrial base station. In a most general sense, the inventive method includes the steps of receiving at a base station a first signal transmitted from a first GPS satellite and a second signal transmitted from a second GPS satellite. The mobile transceiver is adapted to receive these GPS signals as well and transmit a third signal to the base station in response thereto. The base station receives the third signal and uses it to calculate the position of the wireless unit. In a specific implementation, the base station sends aiding information to the wireless unit. The aiding information is used by the wireless unit to quickly acquire the signals transmitted by the first and second satellites and includes satellite identification information, Doppler shift information, and range information between the base station and the satellites. On the acquisition by the wireless unit of the signals transmitted by the first and second satellites, the wireless unit wireless unit calculates the range between the wireless unit and each of the satellites. This range information is transmitted back to the base station along with information as to the time at which the measurement was made. In a CDMA implementation, the time at which the wireless unit transmits the third signal to the base station is known by the base station. The delay in the receipt of the third signal provides an indication to the base station as to the range between the base station and the wireless unit. The base station utilizes information known as to its position, the position of the first and second satellites relative to the wireless unit and the range to the wireless unit from the base station to calculate the position of the wireless unit.
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Espacenet 法律信息 同族专利 专利引用
    • 100. 发明授权
      US5883596A GPS timing receiver using oversampling 失效
    • GPS timing receiver using oversampling
    • GPS定时接收机采用过采样
    • US5883596A
    • 1999-03-16
    • US970051
    • 1997-11-13
    • Eric B. Rodal
    • Eric B. Rodal
    • G01S1/00 , G01S19/03 , G04G7/02 , H04B7/185 , G01S5/02
    • G01S19/235 , G04R40/02
    • A GPS timing receiver for providing a GPS-derived time signal. The GPS timing receiver includes a filter for filtering a GPS signal to a certain information bandwidth, a reference clock for generating a reference clock signal having a clock rate at least ten times the information bandwidth, a sampler using the reference clock signal for oversampling the filtered GPS signal, a correlation subsystem including a microprocessor for correlating the sampled GPS signal to the reference clock signal to measure a time difference between the GPS signal and the reference clock signal, and a time clock to issue a GPS-derived time signal based upon the reference clock signal and adjusted by the measured time difference in increments of the period of the reference clock signal. An optional frequency multiplier multiplies the reference clock rate enabling the time clock to adjust the GPS-derived time signal in increments of the period of the frequency multiplied reference clock signal.
    • 一种GPS定时接收器，用于提供GPS导出的时间信号。 GPS定时接收机包括用于将GPS信号过滤到特定信息带宽的滤波器，用于产生具有至少信息带宽十倍的时钟速率的参考时钟信号的参考时钟;使用参考时钟信号的采样器，用于过滤取样过滤的 GPS信号，包括微处理器的相关子系统，用于将采样的GPS信号与参考时钟信号相关，以测量GPS信号和参考时钟信号之间的时间差，以及基于GPS导出的时间信号发布GPS时间信号的时钟 参考时钟信号，并以参考时钟信号周期的增量的测量时间差进行调整。 可选的倍频器乘以参考时钟速率，使得时钟可以以倍频参考时钟信号的周期为增量来调整GPS导出的时间信号。
    • 基本信息 添加关注 加入工作空间 PDF全文 PDF下载 全文下载 相似专利 双屏查看 权利要求书 说明书全文 Global Dossier Espacenet 法律信息 同族专利 专利引用
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