Indoor positioning method based on three-dimensional wave beams

Abstract

The invention provides an indoor positioning method based on environmental backscattering. The indoor positioning method comprises the following steps that step one, a radio frequency source RFs emitsa signal: the tags of which any three of more than four tags are not arranged at the spatial position of the same plane are included; step two, environmental backscattering of the tags: the tags receive the signal of the radio frequency source RFs and transmit the signal to a mobile terminal Q through the backscattering mode; step three, the mobile terminal Q detects and positions the received tag signal: the four tags of the maximum signal intensity RSSI value are selected and recorded as Ta', Tb', Tc' and Td'; and step four, a unique triangular pyramid can be determined by four coordinatesand the position coordinates (x, y, z) of the unique mobile terminal Q can be determined through the triangular pyramid. The useful signal receiving power of the target can be enhanced, the coverage space can be increased, the method has great anti-multipath effect, the arrangement number of the tags can be saved and the cost of the positioning device can be reduced.

Description

technical field [0001] The invention relates to the technical field of space positioning, in particular to an indoor positioning method based on three-dimensional beams. Background technique [0002] With the rapid increase of data services and multimedia services, people's demand for positioning is increasing. Especially in complex indoor environments, such as airport halls, supermarkets, libraries, underground parking lots, etc., it is often necessary to determine whether the mobile terminal or its Indoor location information of holders, facilities and objects. Most of the current positioning algorithms are only researched on wireless two-dimensional networks. However, in practical applications, wireless network nodes are often in a three-dimensional environment. In these cases, it is necessary to provide three-dimensional position information of nodes. Researchers have proposed many radio frequency-based Recognized indoor positioning solutions. [0003] 1) Use the combi...

AI Technical Summary

Problems solved by technology

However, the downtilt angle of the antenna in the vertical direction in the two-dimensional beam is fixed, only using the airspace resources in the horizontal direction, and the energy concentration is not high enough, thus limiting the coverage

[0006] In summary, none of the above methods is suitable for indoor positioning with complex environments, precise positioning, and high real-time requirements.

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