06070079 is referenced by 27 patents and cites 12 patents.

A positioning apparatus is provided in a cellular base station for positioning a portable terminal in a cell covered by the cellular base station. The positioning apparatus has a base position indicative of a position of the cellular base station on a map. The positioning apparatus comprises an array antenna for receiving a transmission signal transmitted by the portable terminal to output a plurality of reception signals. A receiver section translates the reception signals into a plurality of baseband signals to demodulate the baseband signals into a plurality of demodulated signals. An estimation section estimates incident direction and delay time of the transmission signal on the basis of the demodulated signals to output an estimation result indicative of the incident direction and the delay time. A position calculating means calculates a terminal position of the portable terminal on the map in accordance with the estimation result and the base position to output a terminal position signal indicative of the terminal position.

Title
Positioning apparatus used in a cellular communication system and capable of carrying out a positioning with a high accuracy in urban area
Application Number
9/234577
Publication Number
6070079
Application Date
January 21, 1999
Publication Date
May 30, 2000
Inventor
Yoshihiko Kuwahara
Tokyo
JP
Agent
Ostrolenk Faber Gerb & Soffen
Assignee
NEC Corporation
JP
IPC
H04B 7/02
H04Q 7/36
H04Q 7/20
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