Data processing: vehicles – navigation – and relative location – Navigation – Employing position determining equipment
Patent
1997-02-19
1999-08-03
Cuchlinski, Jr., William A.
Data processing: vehicles, navigation, and relative location
Navigation
Employing position determining equipment
701214, 701216, 342357, 455 121, G06F16500
Patent
active
059318902
ABSTRACT:
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.
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Ishikawa Seiji
Ito Takeshi
Suwa Yoshihisa
Yamamoto Tomohiro
Yasuda Tomio
Aisin Seiki Kabushiki Kaisha
Arthur Gertrude
Cuchlinski Jr. William A.
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