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Factor graph based positioning method

A positioning method and technology of factor diagram, applied in the fields of electrical components, wireless communication, etc.

Active Publication Date: 2013-01-30
湖南赛能环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to improve the positioning accuracy and reduce the positioning complexity in the positioning process

Method used

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Embodiment Construction

[0056] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0057] figure 1 is a schematic diagram showing the information transfer of the multi-target cooperative group localization method (WFG) based on the weighting factor graph. figure 2 is a block diagram showing the structure of (WFG).

[0058] Step 1: The positioning terminal sends a WFG positioning request (Location Request, LR) to the adjacent nodes (base station and terminal);

[0059] Step 2: All nodes receiving the WFG positioning request detect the channel conditions between themselves and the positioning terminal. If the node and the terminal are line-of-sight propagation, the node returns a cooperative positioning response (Cooperative Location ACK, CLACK) and a c...

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Abstract

The invention discloses a factor graph based positioning method. The factor graph based positioning method includes the steps that a positioning terminal transmits a positioning request to adjacent nodes; all the nodes receiving the positioning request detect channel situation between the respective nodes and the positioning terminal and return cooperative positioning responses to the positioning terminal; the positioning terminal transmits a positioning start request to the nodes returning the cooperative positioning responses; each involved node establishes an internal node factor graph after the positioning start request is received; each involved node performs uplink operation on the internal node factor graph; each involved node transmits an uplink operation result to other involved nodes and receives uplink operation results from other nodes; according to the received operation results, each node starts to perform downlink operation to obtain an estimated coordinate value; each node transmits the obtained estimated coordinate value of a mobile terminal to the positioning terminal; and the positioning terminal updates coordinates according to the received estimated coordinate values of all positioning base stations. By the factor graph based positioning method, positioning precision can be improved while positioning complexity is lowered.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a positioning method based on a factor graph. Background technique [0002] Wireless positioning has become one of the main functions of the 3G system, and more and more mobile value-added services require the location of the mobile station. Location information will be widely used in various aspects such as vehicle management systems, intelligent transportation systems (ITS), and social public safety management. [0003] The relative distance between the mobile stations is measured through cooperative communication in a point-to-point manner, and a new cooperative group localization (CGL) technology applied in the next generation mobile communication network is proposed accordingly, and a corresponding The concept of terminal group (TG). TG is a group of mobile stations that support point-to-point coordinated communication and can measure relative distances. Comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
Inventor 崔琪楣张平张雪菲史玉龙邓金刚
Owner 湖南赛能环保科技有限公司
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