Title:
DEVICE FOR MEASURING LOCATION OF MOBILE TERMINAL
Document Type and Number:
Japanese Patent JP3543769
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve convenience by computing the location of a mobile terminal even in an area at which signals only from two base stations or less can be utilized for location computations and enlarging a service area for location information service.
SOLUTION: In the case that the number of base stations usable for location computations is three or more, location computations are performed by triangulation. A location computing method for two base stations and a location computing method for one base station are each provided for the case that the number of usable base stations is two or one, and either one is selected according to the number of usable base stations and used.
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Inventors:
Katsuhiko Tsunehara
Mikio Kuwahara
Mikio Kuwahara
Application Number:
JP2001041123A
Publication Date:
July 21, 2004
Filing Date:
February 19, 2001
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G01S5/02; G01S19/09; G01S19/46; H04B7/26; H04W64/00; (IPC1-7): G01S5/02; H04Q7/34
Domestic Patent References:
| JP2000356672A | ||||
| JP7181242A | ||||
| JP2001174537A | ||||
| JP5333132A | ||||
| JP8160119A | ||||
| JP2000244968A |
Foreign References:
| WO2000075684A1 |
Attorney, Agent or Firm:
Yasuo Sakuta