Firefighter indoor positioning method based on WiFi fingerprint

Abstract

The invention discloses a firefighter indoor positioning method based on WiFi fingerprints, and the method comprises the steps: when a fire disaster happens suddenly, enabling a firefighter rushing into a fire scene to receive the intensity information of a signal transmitted by a wireless access node, and determining the number of a cluster to which the firefighter belongs; calculating and screening the reliability of each wireless access node according to the reliability function of the wireless access nodes, and filtering out the wireless access nodes which are damaged due to the fire; calculating the distance proportion of all reference points in the same cluster by applying a dynamic online matching algorithm in the cluster to which the firefighters belong and combining the signal intensity values received by the reference points, and selecting the reference points of which the distance proportion is greater than a distance proportion threshold value for position estimation; and calculating the position coordinate of the firefighter according to the selected reference point. According to the method, the AP trust function is provided for screening the APs according to the situation that the APs are possibly damaged in thefire scene; and the dynamic online matching algorithm is applied, so that the positioning precision of the algorithm is improved.

Description

technical field [0001] The invention relates to the technical fields of indoor positioning and firefighter positioning, in particular to an indoor positioning method for firefighters based on WiFi fingerprints. Background technique [0002] In recent years, with the development and improvement of satellite positioning technologies such as China's Beidou Satellite Navigation System (BDS) and Global Positioning System (GPS), the problem of firefighter positioning in outdoor environments has been effectively solved. However, these satellite signals cannot penetrate most building materials and cannot be effectively used to determine indoor location, so firefighters need to use other methods for indoor positioning. In general, indoor positioning of firefighters can be performed using sensor technology, ZigBee positioning technology or ultra-bandwidth indoor positioning technology. Among them: sensor positioning technology is particularly sensitive to the environment and has poor...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the prior art, the present invention provides an indoor positioning method for firefighters based on WiFi fingerprints, which can avoid the excessively long running time of the algorithm in the online matching stage; aiming at the failure of the receiving end to receive data due to AP damage that may occur at the fire scene The AP trust function is proposed to screen APs when the data received at the receiving end is inaccurate or the data received at the receiving end is inaccurate; the dynamic online matching algorithm is used to avoid the influence of AP distribution on the positioning accuracy in the online positioning stage, and to further improve the accuracy of the algorithm. positioning accuracy

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