Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating
Patent
1994-03-24
1996-08-20
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Position indicating
342418, G01S 302
Patent
active
055482961
ABSTRACT:
A method and an apparatus for determining a position of a movable object comprise transmission of a radio wave of a constant frequency from the mobile object. The transmitted radio wave is received at each of a plurality of spaced positions which are disposed in an area where the mobile object is movable. A frequency of the received radio wave is detected at each of these positions and the position of the mobile object is determined based on position data indicating the spaced positions and a frequency deviation between the frequency of the received radio wave detected at each of the positions and the constant frequency. Further, in a mobile communication system a radio wave of a constant frequency, which is transmitted from the mobile object, is received at each of a plurality of spaced base stations which are disposed in an area where the mobile object is movable. A frequency of the received radio wave is detected at each of the base stations and the positions of the mobile object is determined based on the positions of the spaced base stations and a frequency deviation between the frequency of the received radio wave detected at each of the base stations and the constant frequency.
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Nippon Steel Corporation
Phan Dao L.
Tarcza Thomas H.
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