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Method for positioning error estimation based on position fingerprints

A positioning error and fingerprint technology, applied in the field of positioning error estimation based on position fingerprints, can solve problems such as large positioning errors

Inactive Publication Date: 2013-12-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] In order to overcome the shortcomings of large positioning errors in existing positioning error estimation methods, the present invention provides a positioning error estimation method based on location fingerprints

Method used

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  • Method for positioning error estimation based on position fingerprints
  • Method for positioning error estimation based on position fingerprints
  • Method for positioning error estimation based on position fingerprints

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Experimental program
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Embodiment Construction

[0023] refer to figure 1 . The specific steps of the positioning error estimation method based on the location fingerprint of the present invention are as follows:

[0024] Step 1. Take the aisle of a certain floor as the area to be positioned and divide it into a rectangular standard grid. Each grid is a sub-area. Take the center of each standard grid as the calibration point. The black circle represents the calibration point, and the horizontal distance between the calibration points The spacing is 3 meters, and the vertical spacing is 2 meters. A total of n=24 sub-regions are selected. Take r=3, introduce three wireless access points AP1, AP2, AP3. Choose A 1 Regional calibration points As the starting point, the coordinates are (0,0). A 2 Regional calibration points The coordinates are (0, 2), and the coordinates of other calibration points are calibrated accordingly.

[0025] Step 2. In the i-th sub-area A i Select a calibration point within And measure the r...

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Abstract

The invention discloses a method for positioning error estimation based on position fingerprints. The method is used for solving the technical problem that an existing method for positioning error estimation is large in positioning error. According to the technical scheme, the method comprises the steps that firstly, RSS in the calibration point positions of an area to be positioned and from a plurality of APs is collected and used as fingerprint information of the area where calibration points are located and a position fingerprint database of the positioned area is established; secondly, an area most similar to the area where each calibration point is located is calculated and the actual distance between the area where each calibration point is located and the most similar area is worked out, so that the average value and the variance of RSS values obtained through multiple times of measurement in the calibration point positions and the distance between the area where each calibration point is located and the most similar area are worked out and serve as an error range in the calibration point positions, and the error range corresponding to a position fingerprint map is established. When a target to be positioned is positioned, the real-time RSS detected by a mobile terminal is obtained, a set of data, capable of being matched with the RSS, in a database is determined according to the matching algorithm, therefore, the actual position of the terminal is obtained, and the corresponding error range is given.

Description

technical field [0001] The invention relates to a positioning error estimation method, in particular to a positioning error estimation method based on position fingerprints. Background technique [0002] The document "Patent Publication No. CN102427603A Chinese Invention Patent" discloses a WLAN indoor mobile user positioning method based on positioning error estimation. When realizing the positioning error of indoor mobile users, the method records the coordinates of reference points in the indoor target positioning environment and the RSS value of each reference point in the offline stage to establish a location fingerprint database. Next, reselect Z location points in the target environment as the training points of the nonlinear mapping function and collect the RSS value at the training point, and obtain the nonlinear mapping of the error between the location fingerprint database location and the real location of the training point relation. In actual positioning, the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
Inventor 张维王力
Owner NORTHWESTERN POLYTECHNICAL UNIV
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