An indoor positioning method based on the combination of distance measurement and fingerprint based on wi-fi network

Abstract

The invention belongs to the technical field of wireless communication and wireless positioning, and discloses an indoor positioning method combining ranging and fingerprinting based on a Wi-Fi network, comprising the steps of constructing an annular fingerprint map for an indoor scene and collecting CSI of each target position; utilizing CIR with the capability of distinguishing a multipath cluster and subjected to phase correction and AGC loop compensation processing to perform distance estimation between transmitting and receiving ends; extracting the fingerprint by using the phase difference data between the antennas; when the distance between the transmitting and receiving ends is determined, only needing to process the fingerprint data on the corresponding loop; using MPL to learn the fingerprint set of each loop and obtaining a classification model, wherein the model receives the real-time fingerprint of the online stage and predicts a location which is defined as a target. Theindoor positioning method combining ranging and fingerprinting based on a Wi-Fi network in the invention utilizes the phase correction to carry out ranging with the CIR after being subjected to AGC loop compensation processing, the ranging precision can be improved, the distance is used for determining the corresponding loop, so that the calculation cost of the online stage can be reduced, and thereal-time response capability of the system can be improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication and wireless positioning, and in particular relates to an indoor positioning method based on the combination of distance measurement and fingerprint based on Wi-Fi network. Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] At present, the existing technologies commonly used in the industry are as follows: with the continuous development of communication technology and the improvement of people's living standards, people's demand for indoor location information continues to increase, and the location information of objects is widely used in various occasions . Wi-Fi networks are widely deployed in typical indoor scenarios, and wireless devices are economical and cheap, which makes indoor positioning based on Wi-Fi networks the most promising among various existing indoor positioning solutions. However, the in...

AI Technical Summary

Problems solved by technology

However, RSS is extremely vulnerable to the influence of the surrounding environment and becomes unstable and difficult to maintain a stable statistical structure

Therefore, using RSS for distance estimation under complex and changeable indoor conditions, it is difficult to distinguish whether the change of RSS is caused by the change of the indoor environment or the change of the distance between the transceivers, so it is difficult to use RSS to establish an accurate distance estimation model

Traditional fingerprint-based indoor positioning methods need to map fingerprints and actual geographic locations. This process requires online fingerprints to be matched with all fingerprints in the fingerprint library, which requires a lot of computing overhead, thus affecting the real-time performance of the positioning system.

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