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A target location method based on support set and expectation maximization in wifi environment

A technology for maximizing expectations and targeting targets, applied to services based on location information, services based on specific environments, positioning, etc., can solve problems such as heterogeneous devices and dynamic characteristics of the environment, and achieve improved accuracy and robustness, The effect of overcoming RSS fluctuations and strong adaptability

Active Publication Date: 2022-04-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is: the present invention provides a target positioning method based on support set and expectation maximization under the WIFI environment, which solves the existing technical problem that the position estimation through similarity calculation cannot solve the dynamic characteristics of heterogeneous equipment and environment

Method used

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  • A target location method based on support set and expectation maximization in wifi environment
  • A target location method based on support set and expectation maximization in wifi environment
  • A target location method based on support set and expectation maximization in wifi environment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Truth-value discovery uses expectation maximization:

[0062] Step 1.1 Fix the position of the AP in the positioning environment and divide the positioning environment into several grid points;

[0063] Step 1.2. Set up the WIFI network, place the signal source at each grid point in the positioning environment in turn and record the position coordinates of the signal source at this time;

[0064] Step 1.3. The placed signal sources transmit signals, record and store the RSS values ​​of the signal sources received by each AP to complete the offline fingerprint library establishment;

[0065] Step 2.1. Obtain the target signal to be positioned;

[0066] Step 2.2. Use the optimal support set selection algorithm to select an appropriate support set size; construct a support set according to the similarity between the target signal and the offline fingerprint library;

[0067] Step 2.3. Estimate the correct position from the support set using expectation maximization.

[...

Embodiment 2

[0147] Truth discovery can also use voting.

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Abstract

The invention discloses a target positioning method based on a support set and expectation maximization in a WiFi environment, relates to the field of WiFi positioning, and includes the following steps: Step 1: Establish an offline fingerprint library; Step 2: According to the target signal obtained online and offline The fingerprint library constructs the support set, and finds and estimates the correct position by performing the true value of the support set to complete the target positioning; the present invention proposes to use the support set to overcome the disadvantages of the optimal matching criterion, and accurately estimate the target position from the support set through the expectation maximization algorithm , which can effectively overcome the RSS fluctuation problem caused by environmental changes and heterogeneous devices, thereby improving the positioning accuracy and robustness.

Description

technical field [0001] The invention relates to the field of WIFI positioning, in particular to a target positioning method based on a support set and expectation maximization under a WIFI environment. Background technique [0002] In recent years, indoor positioning technology has shown broad development prospects and commercial value, such as tracking and management of goods in large supermarkets, real-time monitoring of patients' locations in hospitals, navigation of collections in museums, and smart home applications. Indoor positioning systems need to install transmitting devices at fixed locations to send positioning signals. Common transmitting devices include WIFI, Bluetooth, RFID and UWB, etc., but installing a large number of transmitting devices requires a lot of manpower and material resources, so most positioning systems tend to Use the existing widely deployed wireless devices to achieve indoor positioning. Among them, WIFI has been widely used in various large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/08G01C21/20H04W4/33H04W4/02H04W4/021
CPCH04W4/023H04W4/33G01C21/206G01S5/08
Inventor 郭贤生李林朱世林李会勇万群殷光强
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA