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Positioning method of WLAN (Wireless Local Area Network) indoor mobile user based on positioning error estimation

A positioning error, mobile user technology, applied in electrical components, wireless communication and other directions, can solve the problem of low positioning accuracy of WLAN indoor mobile users, and achieve the effect of eliminating the influence of errors, accurate positioning results, and eliminating positioning errors.

Active Publication Date: 2014-09-24
严格集团股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the problem of low positioning accuracy of WLAN indoor mobile users in the existing method, thereby providing a WLAN indoor mobile user positioning method based on positioning error estimation

Method used

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  • Positioning method of WLAN (Wireless Local Area Network) indoor mobile user based on positioning error estimation
  • Positioning method of WLAN (Wireless Local Area Network) indoor mobile user based on positioning error estimation
  • Positioning method of WLAN (Wireless Local Area Network) indoor mobile user based on positioning error estimation

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Experimental program
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specific Embodiment approach 1

[0020] Specific implementation mode 1: Combination figure 1 To describe this embodiment, the steps of this embodiment are as follows:

[0021] Step 1. Establish a two-dimensional coordinate system in the offline phase, and collect received signal strength RSS (Received Signal Strength) samples from Access Point (AP) at a reference point with known coordinates, and establish a location fingerprint database ;

[0022] Step 2: Calculate in the online stage, use the KNN distance-dependent location fingerprint matching algorithm selected by the present invention to match the received signal strength RSS received by the user's wireless network card with the location fingerprint in the radio signal coverage map, and calculate an initial positioning coordinate;

[0023] Let the numbers of RP and AP be m and n, respectively. S ij Defined as the mean value of RSS samples from the i-th reference point and j-th AP in the database, s j Is the mean value of RSS samples from n APs measured by th...

specific Embodiment approach 2

[0034] Specific implementation manner two: combination Figure 1 to Figure 4 This embodiment is described. The difference between this embodiment and the first embodiment is that according to the process of the first embodiment, figure 2 The effectiveness of the test method under the experimental environment of the company, among them, 9 Linksys WAP54G APs are arranged in an indoor environment of 24.9m×66.4m. The experimental path is from A to D in a 3 meter wide corridor. In the experiment, an ASUS laptop was used to collect data. It is equipped with Intel PRO / Wireless3945ABG wireless network card and RSS sample collection software NetStumbler, with a sampling rate of 2 RSS samples per second. In the offline phase, a total of 182 reference points with a spacing of 1 m were selected along the corridor, and a total of 300 RSS samples were collected for 150 seconds on each RP. In addition, a total of 960 training RSS samples were collected along the experimental path to train ...

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Abstract

The invention provides a positioning method of a WLAN (Wireless Local Area Network) indoor mobile user based on positioning error estimation and relates to a positioning method of the WLAN indoor mobile user. In order to overcome the defects of traditional distance depending type and mode matching type fingerprint matching positioning methods and the problem of few RSS (Received Signal Strength) samples used for positioning by a mobile user, a nonlinear mapping function between the RSS samples and a positioning error, which is trained in an off-line stage is used to establish a relation between the RSS samples and the positioning error. In an on-line stage, the received RSS samples serve as the input of the nonlinear mapping function to estimate the positioning error, and the estimated positioning error is utilized to modify a positioning result of the distance depending type fingerprint matching method, thereby eliminating the influence of the positioning error and greatly promoting the positioning precision of the mobile user. When a position fingerprint database is not updated, the positioning precision of the positioning method provided by the invention is higher than that of the distance depending type fingerprint matching method. When the position fingerprint database is updated and the nonlinear mapping relation needs to be retrained, the distance depending type fingerprint matching method still can be utilized, thereby achieving higher practical application value.

Description

Technical field [0001] The invention relates to a WLAN indoor positioning method based on positioning error estimation. Background technique [0002] In recent years, the demand for location services has increased. However, in an indoor environment, satellite signals are shielded by buildings and the positioning accuracy of the cellular system is difficult to meet the requirements of indoor positioning services. Therefore, providing accurate location services for indoor users has been valued by many research institutions. As WLAN is widely deployed in indoor environments to provide users with communication services, compared to other indoor positioning technologies, such as ultra-wideband, ultrasonic, infrared, Bluetooth, etc., WLAN indoor positioning systems based on fingerprint matching algorithms are considered economical It is a promising solution. This method is generally divided into two stages, namely: offline stage and online stage. In the offline phase, first select ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00
Inventor 徐玉滨孙永亮马琳刘宁庆邓志安
Owner 严格集团股份有限公司