Passive indoor positioning method based on wi-fi

Abstract

The invention provides a passive indoor positioning method based on Wi-Fi, which utilizes multi-path information to perform optimal positioning of indoor target positions. First, the channel state information data is collected and preprocessed; then, the improved multiple signal classification algorithm is used for parameter estimation, and the parameter information such as the arrival angle, signal flight time, and departure angle of multiple paths is obtained; then, using these parameters The complementary relationship between the parameters is used for target positioning; finally, the clustering algorithm is used for positioning correction to obtain the final target position. Since the multi-path information is fully utilized, the method of the present invention has a better positioning effect for typical daily scenes, especially non-line-of-sight scenes.

Description

technical field [0001] The invention belongs to the technical field of intelligent perception, and in particular relates to a passive indoor positioning method based on Wi-Fi. Background technique [0002] With the progress of the times and the development of science and technology, especially the gradual maturity of wireless communication technology in the Internet era, location-based services have gradually attracted widespread attention. With the popularity of mobile devices, indoor positioning has become an increasingly important issue. [0003] Traditional wireless positioning technologies mainly include global positioning system (GPS), cellular wireless positioning technology, etc., which achieve ideal positioning accuracy in a relatively simple outdoor positioning environment, but are not suitable for indoor environments with complex multipaths and many obstacles. But for everyone, more time for work and life is spent indoors, so accurate and stable indoor positionin...

AI Technical Summary

Problems solved by technology

[0007] Although the existing Wi-Fi-based target positioning methods have achieved certain results, there are not many researches on passive positioning, especially when positioning without special equipment is more difficult.

However, there are still some problems to be solved by using commercial Wi-Fi equipment for positioning: First, the main purpose of commercial Wi-Fi is communication, so the extracted data is seriously distorted, so reasonable data preprocessing is required, and processed into Reasonable related parameters for positioning; second, the complexity of the indoor multipath environment makes it difficult to plan the wireless signal propagation path. Make the existing positioning results more limited

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