Indoor position positioning method carrying out RSSI denoising according to RSSI maximum value

A technology of indoor position and positioning method, applied in indoor position positioning, the new indoor position positioning field based on RSSI maximum value for RSSI removal and noise extraction, can solve the problem of not much research, and achieve strong anti-interference and good environmental applicability , high-precision effect

Inactive Publication Date: 2018-02-09
WUHAN UNIV
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Problems solved by technology

In the offline stage, the RSSI signal of all fingerprint reference points in the positioning area is measured and the signal features are extracted to establish a Radio Map location fingerprint database; in the online stage, the signal characteristics of the location points are obtained, and the most similar group or groups are found by matching with the location fingerprint library Fingerprint reference point data, and then use a certain positioning algorithm to obtain the positioning results of the positioning point. It

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  • Indoor position positioning method carrying out RSSI denoising according to RSSI maximum value
  • Indoor position positioning method carrying out RSSI denoising according to RSSI maximum value
  • Indoor position positioning method carrying out RSSI denoising according to RSSI maximum value

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[0020] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0021] please see figure 1 , a kind of indoor location positioning method that carries out RSSI noise removal based on RSSI maximum value that the present invention provides, comprises the following steps:

[0022] Step 1: Select 18 calibration points in indoor environments such as computer rooms and corridors (such as figure 2 ), collect the WiFi Received Signal Strength Index (RSSI) at the calibration point; adopt a sampling rate of 1S, and store the RSSI data collected for 5 minutes to a mobile terminal, such as a mobile phone;

[0023] Step 2: For a ce...

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Abstract

The invention discloses an indoor position positioning method carrying out RSSI denoising according to the RSSI maximum value; the method comprises the following steps: firstly selecting a plurality of calibration points in the indoor environment, and gathering a WIFI receiving signal strength index (RSSI) at each calibration point; aiming at certain calibration point, ranking gathered RSSIs of certain WIFI signal source AP from big to small, and selecting M values in order from the maximum value or the second maximum value; solving the average value of the M values so as to serve as the RSSIestimated value of the AP corresponding to the calibration point; associating all solved RSSI estimated values with calibration point position information so as to form position fingerprints, thus obtaining a position fingerprint database; gathering WIFI RSSI data of a tested point, and processing the data so as to obtain the tested point RSSI estimated value; finally assuming that K fingerprint points closest to the positioning point are selected, and using WKNN to position the tested point, thus determining the tested point estimated position. The method has better positioning precision andinterference immunity which are shown by the positioning results tested under different indoor environments.

Description

technical field [0001] The invention belongs to the technical field of indoor positioning and relates to an indoor position positioning method, in particular to a novel indoor position positioning method for extracting RSSI noise removal based on the maximum value of RSSI. Background technique [0002] With the rapid development of information technology, indoor positioning technology has developed rapidly. Among various indoor positioning technologies, the position fingerprint positioning method based on RSSI (received signal strength positioning technology) has become the mainstream of indoor positioning because it does not need to add any hardware equipment and does not need to know the position information of the AP and the accurate channel model. positioning method. The method is generally divided into two stages: offline and online. In the offline stage, the RSSI signal of all fingerprint reference points in the positioning area is measured and the signal features ar...

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Application Information

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IPC IPC(8): G01S5/02
Inventor 薛卫星花向红邱卫宁张伟赵朋
Owner WUHAN UNIV
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