Positioning system, positioning method and positioning program

A technology for positioning and direction information, applied in the field of positioning systems, can solve the problems of difficulty in accurate positioning of terminals and inability to perform accurate positioning, and achieve the effect of accurate positioning

Inactive Publication Date: 2008-12-31
NTT DOCOMO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, when using delayed waves, accurate positioning cannot be performed.
In cellular systems, etc., generally, direct waves are hardly received, but the above-mentioned delayed waves are received in large quantities, so accurate positioning of terminals becomes difficult

Method used

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  • Positioning system, positioning method and positioning program
  • Positioning system, positioning method and positioning program
  • Positioning system, positioning method and positioning program

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Embodiment Construction

[0042] Hereinafter, preferred implementations of the positioning system and positioning method involved in the present invention in a cellular system will be described in detail with reference to the accompanying drawings. In addition, in the description of the drawings, the same reference numerals are assigned to the same elements, and repeated descriptions are omitted.

[0043] FIG. 1 shows a positioning server 10 that is a positioning system according to the present embodiment. The positioning server 10 is a device that estimates the position of the cellular terminal 20 that is a mobile communication terminal included in the cellular system. The positioning of the cellular terminal 20 by the positioning server 10 is performed using the framework of the cellular system which is a mobile communication system. That is, as shown in FIG. 1 , positioning is performed by utilizing the fact that the cellular terminal 20 performs mobile communication by wirelessly communicating wit...

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Abstract

An object of the present invention is to implement accurate positioning of a mobile communication terminal even in an environment in which delay waves are included in radio waves arriving at the mobile communication terminal from radio wave sources. A positioning server 10 forming a positioning system for estimating a location of a cellular terminal 20 has a distance information acquisition unit 13 for acquiring information indicating distances calculated based on radio waves transmitted and received between a plurality of cellular base stations 30 and the cellular terminal 20; a direction information acquisition unit 14 for acquiring a plurality of pieces of information indicating directions of radio waves received by the cellular terminal 20; a virtual sector calculation unit 15 for calculating for each of the cellular base stations, a range of directions from the cellular base station 30 to the cellular terminal 20 from the information indicating the directions of the radio waves, based on a range calculation rule stored in advance; and a location calculation unit 16 for calculating the location of the cellular terminal 20, based on the distances and the range of directions.

Description

technical field [0001] The present invention relates to a positioning system, a positioning method, and a positioning program for estimating the position of a mobile communication terminal. Background technique [0002] Conventionally, a method of estimating the position of a mobile communication terminal receiving the radio waves using radio waves as radio signals is known. For example, there is a method of calculating the distance from the mobile communication terminal to the transmission source when the number of radio wave transmission sources is three or more, and obtaining the distance calculated with the position of each transmission source as the center of the circle. The intersection point of the respective circles whose distance is the radius is regarded as the position of the receiving terminal. As such systems, GPS (Global Positioning System: Global Positioning System) and AFLT (Advanced Forward Link Trilateration: Advanced Forward Link Trilateration) and the li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/14G01S5/12H04W64/00
Inventor 沈纪恽小田恭弘泷石浩生
Owner NTT DOCOMO INC
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