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A Hybrid Indoor Localization Method Based on Bidirectional Correction in Dynamic Environment

A two-way correction and positioning method technology, which is applied to services based on specific environments, services based on location information, wireless communications, etc., can solve the problems of low positioning accuracy and high positioning costs, and achieve improved positioning accuracy, reduced positioning time, The effect of good stability and versatility

Active Publication Date: 2019-11-22
TAIYUAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of low positioning accuracy and high positioning cost of existing indoor positioning algorithms, the present invention proposes a hybrid indoor positioning method based on dynamic environment bidirectional correction

Method used

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  • A Hybrid Indoor Localization Method Based on Bidirectional Correction in Dynamic Environment
  • A Hybrid Indoor Localization Method Based on Bidirectional Correction in Dynamic Environment

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Embodiment Construction

[0023] A hybrid indoor positioning method based on bidirectional correction in a dynamic environment, comprising the following steps:

[0024] (1) Establish a multi-eigenvalue fingerprint map. There are two specific combinations of eigenvalues: one is based on the combination of α values ​​(receiver ID number, corresponding coordinates, path loss coefficient η), and the other is based on the combination of RSS values (RSS value, corresponding coordinates, corresponding receiver ID number).

[0025] The method of obtaining the weight value α is as follows:

[0026] where PL(d 0 ) at reference point d 0 The power loss at , η is the path loss coefficient, R i for the receiver S i Measured distance to transmitter, is an independently distributed Gaussian random variable with zero mean.

[0027] Actual distance R in NLOS environment i , expressed as follows Measuring distance l under LOS environment i , expressed as follows Actual distance R in NLOS environment i ...

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Abstract

The indoor locating technology has been widely used in many important fields, comprising indoor navigation, medical care and mobile social networks. At present, there are two main methods to achieve indoor locating: a three-side measurement method with higher errors and a fingerprint map method with a higher cost. The latter has become the preferred method because of its high accuracy, but the key factors have not yet been solved: fingerprint map updating. The invention provides a hybrid indoor locating system algorithm based on dynamic environment bidirectional correction. The algorithm performs bidirectional correction by suing the three-side measurement method and the fingerprint map method so as to locate the position of a to-be-measured point in a dynamic environment. The system extracts multiple features to inhibit the multipath effect and improve the locating precision; the bidirectional correction of two locating methods is adopted to adapt to the dynamic environment and reduce the cost of repeatedly updating a database. It is found from the performance estimation of the system that the system shortens the locating time, has better stability and universality and greatly improves the locating precision in the dynamic environment.

Description

technical field [0001] The invention relates to a hybrid positioning algorithm based on a trilateration method and a fingerprint map method in a dynamic environment, belongs to the field of wireless communication, and specifically relates to a hybrid indoor positioning method based on a dynamic environment bidirectional correction. Background technique [0002] Indoor positioning systems are indispensable in current popular applications, such as indoor navigation, smart medical care, mobile social networking, etc. According to surveys, the economic benefits of indoor positioning in the global industrial market will reach 400 million US dollars. The current mainstream positioning algorithms are mainly divided into two categories: based on trilateration and fingerprint mapping. Based on the trilateration method, the distance or angle is mainly measured through RSSI, TDOA, AOA, etc., and then the coordinates of unknown points are obtained through distance calculation. Based on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W4/02H04W4/33H04W64/00
CPCH04W4/022H04W4/023
Inventor 李灯熬赵菊敏杨斌
Owner TAIYUAN UNIV OF TECH
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