Wi-Fi indoor multi-user positioning method based on principle of phased array

Abstract

The invention discloses a single-equipment Wi-Fi indoor multi-user positioning method based on principle of a phased array. The method mainly includes two parts of angle measurement and distance measurement; in an indoor environment, an antenna array is deployed, and then angle measurement is carried out with the idea of the phased array; and by means of scanning from coarse granularity to fine granularity, scanning time is reduced; by means of an equi-signal method, the precision of angle measurement is increased. By means of the steps, angles of all the targets can be acquired; and finally distance measurement to the targets is carried out via a multiple-frequency method, and the angle information and distance information are combined to complete the multi-user positioning.

Description

technical field [0001] The invention belongs to the field of wireless perception, and in particular relates to an unbound Wi-Fi indoor multi-person positioning method based on a single device using the phased array principle. Background technique [0002] Indoor positioning refers to the realization of position positioning in the indoor environment. It can be used in airport halls, exhibition halls, warehouses, supermarkets, libraries, underground parking lots, mines and other environments, but it is limited by the positioning time, positioning accuracy and complex indoor environments. Due to limitations, relatively complete positioning technology (such as GPS) cannot be well utilized at present. Therefore, experts and scholars have proposed many indoor positioning technology solutions, which are mainly divided into three categories, based on computer vision, based on GPS technology and based on wireless positioning technology. [0003] When using computer vision for positi...

AI Technical Summary

Problems solved by technology

However, such a system has some inherent disadvantages. Firstly, the process of data collection is very cumbersome, and secondly, slight changes in the surrounding environment will lead to unsuccessful matching, and even the database needs to be re-established.

The second is the ranging method, which generally achieves the positioning of the target by measuring the flight time of electromagnetic waves, such as using FMCW to directly measure the flight time, or using the phase to obtain the flight time indirectly. However, it is difficult to accurately measure the flight time. , requires the target to do some predefined action at a predefined location

However, fingerprint-based methods require extensive training, time-of-flight-based methods require user intervention, and goniometric-based methods require multiple devices.

Not only that, but the above method is generally used for single person positioning. When multiple people are locating, due to the mutual influence and mutual occlusion of people, the positioning results of the above technology are very poor.

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