Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-03-08
2005-03-08
Urban, Edward F. (Department: 2685)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456400, C455S456500, C455S456600, C342S357490, C342S357490, C342S357490, C342S172000, C701S207000, C701S213000, C701S214000, C340S988000, C340S993000
Reexamination Certificate
active
06865394
ABSTRACT:
A positioning method, which is related to a technique to measure a correct position of a terminal by preventing time required for the position measurement, of calculating a position of a receiver according to signals from a plurality of wireless transmitters includes a first step of measuring propagation delay time of the signal from each of the wireless transmitters and calculating a position of the receiver and a standard deviation about measuring distance error, a second step of calculating a positioning error of the receiver a third step of determining, according to the positioning error calculated by the second step, wireless transmitters in directions nearer to a direction in which the positioning error is large, and a fourth step of re-detecting signals from the wireless transmitters determined by the third step and thereby re-calculating the position of the receiver.
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Ishifuji Tomoaki
Kuwahara Mikio
Ogino Atsushi
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi LTD
Phan Huy
Reed Smith LLP
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