A method and device for selecting AP in indoor WLAN fingerprint positioning

Abstract

Embodiments of the invention provide a method and a device for selecting a AP in indoor WLAN fingerprint location. The method includes the following steps: calculating signal similarity between each of APs according to a Pearson correlation coefficient calculation formula and obtained reference signal strength of each of the access point APs at each of detection coordinate points, determining theAPs with the signal similarity satisfying a preset similarity condition, and obtaining AP groups; selecting the APs with preset number from each of the AP groups to obtain valid APs, and storing the reference signal strength of each of the valid APs at each of the detection coordinate points; and determining coordinates of a terminal and sending the coordinates to the terminal the coordinates of the terminal according to a preset positioning matching algorithm, the reference signal strength of each of the valid APs at each of the detection coordinate points, and detection signal strength of the valid APs in each of the received Aps when a positioning request, sent by terminal and carrying the detection signal strength of each of the Aps, is requested. Through adoption of the method and thedevice, the online matching calculated amount can be reduced.

Description

technical field [0001] The present application relates to the technical field of indoor positioning, in particular to a method and device for selecting an AP in indoor WLAN fingerprint positioning. Background technique [0002] Indoor location-based services have received extensive attention and research because of their huge social and economic potential. It is predicted that the indoor location-based service market will reach 10 billion US dollars by 2020. Nowadays, global positioning system technology based on global positioning system and Beidou can provide accurate outdoor location services. However, in valleys, densely built urban areas, and indoor environments, obstacles block the propagation of satellite positioning signals, and satellite positioning systems cannot obtain accurate positioning results in these environments. In order to solve the problem of precise positioning in these scenarios, an indoor positioning technology based on WLAN (Wireless Local Area Net...

AI Technical Summary

Problems solved by technology

[0004] However, now indoor wireless communication mostly adopts MIMO (Multiple-Input Multiple-Output, multiple-input multiple-output system) technology. MIMO technology will cause the signal strength of multiple APs at the same location to be very similar. The contribution of an AP is equivalent to that of an AP. The existing indoor positioning technology based on WLAN fingerprints does not distinguish multiple APs with similar signal strengths at the same location, but adds all these APs to the location fingerprint database, resulting in location Redundancy of fingerprint library, redundancy of location fingerprint library will lead to excessive online matching calculation in the stage of online matching calculation between the AP signal of the point to be located and the location fingerprint library

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