Single-node indoor positioning method based on power delay profile and direction of arrival distance measurement

A power delay distribution, indoor positioning technology, applied in positioning, radio wave measurement system, measurement device and other directions, can solve the problems of large positioning error of single node, consumption of large material and financial resources, positioning accuracy, etc., to achieve high positioning accuracy and saving. Human and material resources, the effect of reducing positioning error

Inactive Publication Date: 2017-08-04
HARBIN INST OF TECH +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the low positioning accuracy of the existing fingerprint positioning system. The positioning accuracy depends on the pros and cons of the approximation algorithm. The fingerprint positioning needs to deploy a large number of positioning nodes in the positioning environment and collect fingerprints in advance, which consumes a lot of material resources. Due to the shortcomings of financial resources and large positioning errors achieved by a single node, a single-node indoor positioning method based on power delay distribution and angle-of-arrival ranging is proposed

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  • Single-node indoor positioning method based on power delay profile and direction of arrival distance measurement
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  • Single-node indoor positioning method based on power delay profile and direction of arrival distance measurement

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specific Embodiment approach 1

[0023] Specific implementation mode 1: The specific process of a single-node indoor positioning method based on power delay distribution and angle-of-arrival ranging in this implementation mode is as follows:

[0024] For wireless devices that support the IEEE 802.11n protocol, when the receiver receives the data packet, it will process the data packet and generate some data information to store in the data, including received signal strength, channel noise, and channel state information.

[0025] In the past, indoor positioning systems often used received signal strength (RSS) for positioning, but signal strength information is easily affected by multipath effects, and each data packet can only carry one signal strength. For this, the present invention uses channel state information as a data source to analyze the position of the point to be located.

[0026] Before introducing the positioning method, the composition of channel state information and phase error is introduced....

specific Embodiment approach 2

[0039] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the phase information and the amplitude information in the channel state information of the indoor positioning system receiver are obtained in the step two; the specific process is:

[0040] The channel state information is obtained from the data packet of the indoor positioning system receiver through the toolkit CSITOOLS. The channel state information is the channel frequency response, and the channel frequency response formula is:

[0041]

[0042] In the formula, H(f k ) for frequency f k channel frequency response, ||H(f k )||is the amplitude fading of the channel, θ k is the frequency f k The phase information of the corresponding real channel state information, j is an imaginary number, j 2 =-1;

[0043] The channel frequency response is a set of complex number arrays with a dimension of 30×A, and the value is a positive integer; solve the angle information of ...

specific Embodiment approach 3

[0046] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 3, an interpolation method is used to eliminate the error of the phase information obtained in the channel state information; the specific process is:

[0047] The phase information φ in the channel state information of the indoor positioning system receiver k and carrier frequency f k The phase information θ of the corresponding real channel state information k The relationship between is expressed as

[0048] φ k = θ k -2πK k f k δ+β+Z

[0049] In the formula, K kIndicates the dimension of the subcarrier, in this example -28,-26,...,-2,-1,1,3,5,...,27,28; 1≤k≤N, N is the wifi device The number of subcarriers that can be collected, the subscript k is the serial number from 1 to 30, β is the equivalent phase deviation of the indoor positioning system receiver, and δ is the sampling frequency deviation of the receiver and the received data packet detection delay deviati...

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Abstract

The invention relates to a single-node indoor positioning method based on power delay profile and direction of arrival distance measurement. The invention aims to solve defects that an existing fingerprint map positioning system is low in positioning accuracy, the positioning accuracy depends on the performance of an approximation algorithm, fingerprint map positioning need to deploy a lot of positioning nodes in a positioning environment and acquire a fingerprint map in advance, a lot of material resources and financial resources are consumed, and that the single node is large in positioning implementation error. The process of the single-node indoor positioning method comprises the steps that firstly, an indoor positioning system receiver acquires a group A of channel state information; secondly, phase information and amplitude information in the channel state information are acquired; thirdly, error elimination is performed on the phase information in the acquired channel state information by adopting an interpolation method; fourthly , the amplitude information and the error eliminated phase information are processed so as to acquired a transmission distance; and fifthly, the customer location is solved based on trilateral positioning according to the the transmission distance acquired in the step four. The single-node indoor positioning method is applied to the field of indoor positioning.

Description

technical field [0001] The invention relates to a single-node indoor positioning method based on power delay distribution and angle-of-arrival ranging. Background technique [0002] At present, the mainstream indoor positioning system based on WLAN adopts fingerprint positioning technology. In the fingerprint positioning technology, the receiver calculates its own position by comparing the measurement results of the received signal with the pre-stored fingerprints, and the fingerprints are obtained by point-by-point measurement of the selected measurement points during the system establishment process. out. [0003] The basic principle of fingerprint positioning is to select some test points in a certain area, measure a certain feature vector at these points, such as RSS, AOT, AOA, to generate a fingerprint map, and then measure the same feature vector at the position to be positioned , and then compare this vector with the vector in the fingerprint map, and find the close...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02G01S5/14
Inventor 韩帅李毅孟维晓
Owner HARBIN INST OF TECH
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