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WIFI indoor positioning method under linear unstable environment

An indoor positioning and stable technology, applied in positioning, wireless communication, wireless communication services, etc., can solve the problems of large changes in wireless access points, achieve the effects of reducing computational complexity, improving positioning efficiency, and improving positioning accuracy

Active Publication Date: 2016-02-24
SHANGHAI UNIV
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to address the defects of the prior art, and to provide a WIFI indoor positioning method in a linearly unstable environment for the problem of large changes in the wireless access point (AP-AccessPoint) in a linearly unstable environment.

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  • WIFI indoor positioning method under linear unstable environment
  • WIFI indoor positioning method under linear unstable environment
  • WIFI indoor positioning method under linear unstable environment

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Embodiment Construction

[0042] The technical scheme of the present invention is described in further detail below in conjunction with the embodiments. The present invention is applied in a linear unstable environment, and the structure diagram of the WIFI guidance system is as follows: figure 1 shown.

[0043]The working mode of the system is divided into offline data collection stage and online real-time positioning stage.

[0044] In the offline data acquisition stage, n reasonable reference points should be set and marked in the linear environment first. Then use the handheld terminal to collect WIFI information on each reference point and store it in the database. The server side clusters the collected WIFI fingerprint information according to the access point clustering mechanism, and finally stores the clustering result in the database again. The data exchange diagram in the offline data collection stage is as follows: figure 2 shown. The workflow flow chart of the offline data collection ...

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Abstract

The invention relates to a WIFI indoor positioning method under a linear unstable environment. The method is divided into an offline data acquiring state and an online real-time positioning stage. The offline data acquiring stage comprises the following steps: adopting an access point clustering mechanism based on wireless access point (AP-Access Point) correlation coefficient, clustering the wireless AP, wherein influence caused by the change of the wireless AP change is reduced, and the positioning precision is improved; meanwhile, a short-time path memory WKNN (weighted K-Nearest Neighbor) algorithm is provided aiming at the linear environment, a positioned result within a minute before is stored in a database as the short-time path memory data, and then the weight is distributed according to time order, the computation complexity is greatly reduced, and the positioning efficiency is improved. The method disclosed by the invention is in full consideration of the problems that a WIFI signal is unstable and the wireless AP is large in change, so that the influence of the adding and the removing of the wireless AP to the positioning is reduced, and the positioning precision and the positioning efficiency are improved.

Description

technical field [0001] The invention relates to a WIFI indoor positioning method in a linear unstable environment. Background technique [0002] At present, the indoor positioning technology mainly adopts optical tracking positioning technology, A-GPS positioning technology, ultrasonic positioning technology, RFID technology, WIFI technology and so on. These technologies also have certain application ranges and limitations in practical applications. For example, A-GPS and base station technologies need to modify the infrastructure, and the cost is relatively high. The detection range of Bluetooth technology is small, and the ultrasonic and infrared methods are easily blocked by the medium. WIFI technology is widely used in modern life because of its complete infrastructure. Whether in public places such as hospitals, department stores, supermarkets, or private places such as communities and villas, there are very extensive WIFI hotspot deployments. People can connect to CM...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/04G01S5/02
CPCG01S5/0252H04W4/04H04W84/12
Inventor 严军郑新元
Owner SHANGHAI UNIV
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