A metasurface-based positioning system, method and device

Abstract

Embodiments of the present invention provide a metasurface-based positioning system, method, and device. The system includes: a base station and a mobile terminal, wherein the base station is configured with a metasurface, and transmits multiple electromagnetic waves carrying positioning signals as signal waves. Control the metasurface to change the transmission path of the signal wave to obtain the first reflected beam, and use the first reflected beam to scan the mobile terminal; after the mobile terminal receives the first receiving beam in the first reflected beam, based on the The emission angle, arrival angle, and transmission path length of the first positioning signal are calculated to obtain the first position parameter, and the first feedback information carrying the first position parameter is fed back to the base station; The positioning result of the terminal. By applying the embodiments of the present invention, it is possible to actively change the signal transmission path to reduce the influence of the multipath effect on the signal during transmission, thereby improving the positioning accuracy.

Description

technical field [0001] The present invention relates to the technical field of positioning, in particular to a positioning system, method and device based on a metasurface. Background technique [0002] In some scenarios, it is necessary to locate the mobile terminal through the positioning signal transmitted by the base station in complex environments such as non-line-of-sight (two points of communication are blocked). For example, lifeguards will carry mobile positioning equipment when performing life rescue in the forest , after the mobile positioning device receives the positioning signal transmitted by the base station, it will analyze the positioning signal to calculate its own position parameter, and feed back the position parameter to the base station, and the base station can use the position parameter fed back by the mobile positioning device Determine the positioning result of the mobile positioning device, so as to determine the position of the lifeguard. [000...

AI Technical Summary

Problems solved by technology

[0003] However, the existing positioning schemes are based on direct path signals. In complex environments such as forests, due to the influence of obstacles, multipath effects will occur during signal transmission, that is, after signals are transmitted through different paths, each signal The components arrive at the receiving end at different times, and are superimposed on each other according to their respective phases to cause interference, which makes the original signal distorted or produces errors, which affects the accuracy of the final positioning result

[0004] Multipath effect is one of the bottleneck problems restricting high-precision positioning at present. However, it is difficult for existing positioning methods to actively change the transmission path of signals. The only way to minimize the impact of multipath effect on positioning results is to passively identify and eliminate multipath signals. Influences, such as FRFT (Fractional Fourier Transform) multipath delay estimation algorithm proposed in some related technologies to eliminate sequentially according to the energy of multipath components, multipath suppression method based on multi-gate delay and curve fitting, carrier sweep based Frequency pseudo-random code multipath suppression methods, etc., these methods have a large amount of calculation, and the elimination effect is not ideal

[0005] The research on passive identification and elimination of multipath signals in the existing technology is close to the theoretical limit, and it is necessary to provide a positioning scheme that can actively change the signal transmission path to improve positioning accuracy

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