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Fresnel zone-based shipborne environment multi-target indoor positioning method

An indoor positioning and multi-target technology, which is applied in the field of multi-target indoor positioning in the ship-borne environment based on the Fresnel zone, can solve the problems of small positioning calculation amount, large positioning calculation amount, and low positioning accuracy, and achieve low cost, High positioning accuracy, the effect of improving positioning accuracy

Active Publication Date: 2021-04-30
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects and problems of high cost, low positioning accuracy, and large amount of positioning calculation in the prior art, and provide a Fresnel zone-based ship with low cost, high positioning accuracy, and small positioning calculation amount. Multi-target indoor localization method in loaded environment

Method used

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  • Fresnel zone-based shipborne environment multi-target indoor positioning method
  • Fresnel zone-based shipborne environment multi-target indoor positioning method
  • Fresnel zone-based shipborne environment multi-target indoor positioning method

Examples

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Embodiment

[0133] see figure 1 , a Fresnel zone-based multi-target indoor positioning method for a shipboard environment, the method includes the following steps:

[0134] A TP-Link router is used as the signal transmitter, and three Thinkpad T-series laptops equipped with Intel 5300 wireless network card, 4G memory and Ubuntu 14.04 LTS are used as CSI collectors, and each laptop is equipped with three external antennas;

[0135] A. Collect CSI data at each moment, and the CSI data is expressed in matrix form;

[0136] The CSI matrix is:

[0137] Y(f)=H(f)×X(f)

[0138] Among them, Y(f) is the received signal, H(f) is the channel frequency response, and X(f) is the transmitted signal;

[0139] B. Use linear fitting to dynamically clean the CSI phase, eliminate the dynamic phase error of the CSI, retain relatively accurate CSI phase measurement values, and obtain a time-domain power delay curve; specifically include the following steps:

[0140] B1. Calculate the linear fitting of the...

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Abstract

The invention discloses a Fresnel zone-based shipborne environment multi-target indoor positioning method. The method comprises the following steps of collecting offline CSI data; dynamically cleaning the CSI phase to obtain a CSI phase measurement value and a time domain power delay curve; modeling a sight distance path dominant condition by utilizing Rian envelope distribution, calculating the ratio of the power of a sight distance path component to the power of a scattering non-sight-distance path to obtain a RianK factor, and judging the probability that a target exists in a Fresnel region; measuring and calculating a total fitting error of the WiFi signal, solving an optimization problem to identify a skin signal, and further determining the direction of the target in the Fresnel zone; determining all the subareas and calculating corresponding directed Fresnel features of all the subareas, and constructing a Fresnel feature table; and matching the acquired online Fresnel feature matrix with the offline Fresnel feature table by using a support vector machine to obtain the real-time position of the user. According to the design, the cost is reduced, the positioning precision is improved, and the positioning calculation amount is reduced.

Description

technical field [0001] The invention relates to the field of indoor positioning in the ship-borne environment of intelligent transportation, in particular to a Fresnel zone-based multi-target indoor positioning method in the ship-borne environment, which is mainly suitable for improving positioning accuracy and reducing the amount of positioning calculations on the basis of reducing costs. Background technique [0002] In recent years, indoor positioning has played a vital role in many emerging applications. However, most existing positioning technologies require the target to carry a communication device itself, which makes many scenarios inapplicable. With the ubiquity of Wi-Fi applications, Wi-Fi-based passive indoor positioning technology, which does not require users to wear any wireless devices and can penetrate non-metallic walls, has received great attention from academia and industry. focus on. Existing WiFi-based indoor passive positioning methods are passive posi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/33H04W64/00H04B17/391G06K9/62
CPCH04W4/33H04W64/00H04B17/3911G06F18/22G06F18/2411
Inventor 刘克中王国宇陈默子曾旭明杨稳陈梦达马玉亭李春伸
Owner WUHAN UNIV OF TECH
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