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    • 10. 发明授权
    • Positioning system utilizing GPS satellites
    • GPS卫星定位系统
    • US5931890A
    • 1999-08-03
    • US808955
    • 1997-02-19
    • Yoshihisa SuwaSeiji IshikawaTomohiro YamamotoTakeshi ItoTomio Yasuda
    • Yoshihisa SuwaSeiji IshikawaTomohiro YamamotoTakeshi ItoTomio Yasuda
    • G01C21/00G01S1/00G01S19/22G01S19/28G01S19/49G06F165/00
    • G01S19/42G01S19/22G01S19/28
    • A positioning system is disclosed in which a rate of change .DELTA..DELTA.f in a Doppler shift .DELTA.f of the radio wave transmitted from a GPS satellite is detected in order to determine whether or not an extraordinary radio wave as caused by a multi-path or the like is being received, and a GPS satellite from which an extraordinary radio wave is received is excluded from a group of GPS satellites which are utilized in a positioning calculation. A difference .DELTA.f between a signal frequency f0 transmitted from a GPS satellite and a signal frequency fR receiver is calculated, and a rate of change .DELTA..DELTA.f in the difference .DELTA.f is also calculated. The position of a receiver is calculated on the basis of information transmitted from a plurality of GPS satellites for which the rate of change .DELTA..DELTA.f is equal to or less than a first threshold value, or .DELTA..DELTA.f.ltoreq.30 Hz/s, and the azimuth of a traveling direction of the receiver is calculated on the basis of information transmitted from a plurality of GPS satellites for which the rate of change .DELTA..DELTA.f is equal to or less than a second smaller threshold value or .DELTA..DELTA.f.ltoreq.15 Hz/s.
    • 公开了一种定位系统,其中检测到从GPS卫星发射的无线电波的多普勒频移DELTA f中的变化率DELTA DELTA f,以便确定由多路径引起的非凡无线电波 正在接收,并且从定位计算中使用的一组GPS卫星中排除从其接收非正常无线电波的GPS卫星。 计算从GPS卫星发送的信号频率f0和信号频率fR接收机之间的差ΔTA,并且还计算差ΔTATA中的变化率DELTA DELTA f。 基于从变化率DELTA DELTA f等于或小于第一阈值或DELTA DELTA f 30Hz / s的多个GPS卫星发送的信息来计算接收机的位置 并且基于从其变化率DELTA DELTA f等于或小于第二较小阈值或DELTA DELTA f'的多个GPS卫星发送的信息来计算接收机的行进方向的方位角, / = 15Hz / s。