Passive indoor positioning method based on Wi-Fi

Abstract

The invention provides a passive indoor positioning method based on Wi-Fi. Indoor target position optimization positioning is carried out by using multipath information. The method comprises the stepsof firstly, acquiring channel state information data, and preprocessing the channel state information data; secondly, performing parameter estimation by utilizing an improved multi-signal classification algorithm to obtain parameter information such as arrival angles, signal flight time and departure angles of multiple paths; then, performing target positioning by utilizing a complementary relationship among the parameters; and finally, performing positioning correction by using a clustering algorithm to obtain a final target position. Due to the fact that the multipath information is fully utilized, the method has a better positioning effect on daily typical 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 received 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 multipath and many obstacles. But for everyone, more work, life and other time are spent indoors, so accurate and stable indoor position...

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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