Low cost passive positioning method based on fine grain subcarrier information

A positioning method and sub-carrier technology, which can be applied to services based on location information, wireless communication, electrical components, etc., can solve the problems of high cost, large manpower and material resources, insufficient positioning accuracy, and low cost of applicability, so as to reduce costs. , reduce the impact, improve the effect of the feasibility

Active Publication Date: 2017-02-22
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can obtain satisfactory high precision, but whenever the environment undergoes great changes or slight changes, it needs to manually update the fingerprint database periodically to obtain accurate positioning, and this process will consume a lot of manpower and material resources
Therefore, the cost required by this type of method is too high, and the feasibility is not good.
[0006] To sum up, existing passive technologies have deficiencies in positioning accuracy, applicability, cost, etc.

Method used

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  • Low cost passive positioning method based on fine grain subcarrier information
  • Low cost passive positioning method based on fine grain subcarrier information
  • Low cost passive positioning method based on fine grain subcarrier information

Examples

Experimental program
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Embodiment 1

[0054] Such as figure 1 As shown, a low-cost passive positioning method based on fine-grained subcarrier information includes the following steps:

[0055] Step 1. Build a WI-FI transceiver network, including 4 transmitters and 7 receivers. One link from one transmitter to one receiver is a link, so there are 4×7 links in the WI-FI transceiver network ;

[0056] In a typical home environment with a size of 10m×15m, 11 laptops equipped with Intel 5300 NIC are randomly deployed. Among them, four computers are used as the sending end, and the remaining 7 are used as the receiving end. The environment includes furniture and obstacles in the form of concrete walls and glass / metal doors. The distance between every two test points is 0.6m, and the experimental object is a person with a height of 1.72m, standing at each test point in turn. The client gets CSI every 100 milliseconds (a typical beacon transmission interval). Acting as the server is a desktop computer with a 3.6GHz ...

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Abstract

The invention discloses a low cost passive positioning method based on fine grain subcarrier information. The method comprises the following steps of constructing a WI-FI transmit-receive network; when there is no target in the constructed WI-FI transmit-receive network, collecting a CSI value of each link and taking as a baseline CSI value, and when there is one target in the constructed WI-FI transmit-receive network, collecting the CSI value of each link and taking as a CSI measured value; carrying out filtering preprocessing on the CSI measured value so as to acquire the preprocessed CSI value; and according to a power attenuation model, establishing an equation set, constructing an objective function and solving the objective function so as to realize target positioning. In the invention, a condition that a lot of manpower and material resources are used to establish a fingerprint database is avoided, corresponding cost is reduced, the acquired CSI value is preprocessed, an influence of multipath to positioning precision is effectively decreased and feasibility of a passive positioning method based on the model is increased.

Description

technical field [0001] The invention relates to the technical field of indoor positioning, in particular to a low-cost indoor passive positioning method based on fine-grained subcarrier information. 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 popularity of WiFi applications, passive indoor positioning technology based on WiFi has attracted great attention from academia and industry because it does not require users to wear any wireless devices and can penetrate non-metallic walls. [0003] The existing WiFi-based indoor passive positioning methods are divided into the following two categories: [0004] The first category: passive positioning based on RSS. Because commercial equipment can obtain RSS information conveniently, this method realize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04W24/08H04W24/10H04W64/00
CPCH04W4/023H04W24/08H04W24/10H04W64/00
Inventor 房鼎益王旋王举陈晓江王安文王薇彭瑶汤战勇徐丹
Owner NORTHWEST UNIV
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