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CSI-based high-precision ranging positioning method

A positioning method and high-precision technology, applied in the field of wireless positioning, can solve problems such as cumulative position errors, and achieve the effect of high positioning accuracy and strong realization.

Inactive Publication Date: 2018-07-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, this technology often produces a large cumulative position error over time due to the zero drift of the gyroscope.

Method used

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  • CSI-based high-precision ranging positioning method
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  • CSI-based high-precision ranging positioning method

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Embodiment Construction

[0055] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0056] The technical solution adopted in the present invention is: a CSI-based high-precision ranging and positioning method, which specifically includes the following steps:

[0057] 1) In the offline phase, select multiple calibration points in the positioning area where the target is located, and measure the distance from each calibration point to the Access Point (AP), and obtain the layout of the AP in the positioning area;

[0058] 2) Configure the wireless local area network, the target transmits data at the selected punctuation position, the AP receives the arriving data, and extracts the channel state information (Channel State Information, CSI) from the received data;

[0059] 3) using the CSI information obtained in step 2) to estimate the parameters of the signal propagation model, and finally obtain an adaptive signal propagation model;

[0060] 4) In th...

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Abstract

The invention provides a high-precision ranging positioning method based on channel state information (CSI). The positioning method is mainly divided into an offline phase and an online phase. In theoffline phase, firstly multiple calibration points are selected in a positioning area, then an access point (AP) extracts the CSI from the data from the calibration points and filters the CSI, an environmental factor and a path loss coefficient are obtained by using CSI before and after filtering, the environmental factor and the path loss coefficient are linearly fitted to obtain an adaptive pathloss coefficient, and an adaptive signal propagation model is obtained. In the online phase, the received CSI is filtered, filtered CSI energy is brought into the adaptive propagation model for distance estimation, and an obtained distance is brought into a positioning algorithm for positioning. Compared to the conventional positioning technology, the positioning technology of the invention has the advantage that CSI phase correction compensation and AP synchronization are not needed. In addition, the method has high engineering achievability and high positioning accuracy and is suitable formultiple positioning scenes such as a single station and multiple stations.

Description

technical field [0001] The invention relates to the technical field of wireless positioning, in particular to a CSI-based high-precision ranging positioning method. Background technique [0002] With the arrival of the second half of the fourth technological revolution, the development of the Internet industry has also begun to enter a new era - the U (ubiquitous) era. Many things will be connected to the Internet and become automated and intelligent. In this context, many emerging technology industries will open up huge markets, such as Internet of Vehicles, drones, image processing, artificial intelligence and other technologies that have received widespread attention, and indoor positioning is one of them. [0003] In the current research in the field of indoor positioning, signal parameter information such as received signal strength (Received Signal Strength, RSS), signal angle of arrival (Angle of Arrival, AoA), signal time of arrival (Time of Flight, ToF) or motion se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/12H04W64/00
CPCG01S5/12H04W64/006
Inventor 田增山廉颖慧周牧杨小龙李泽张千坤
Owner CHONGQING UNIV OF POSTS & TELECOMM
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