Indoor positioning method and system

Abstract

The invention relates to an indoor positioning method and system, wherein the indoor positioning method comprises the steps of primary distance measurement, and precise positioning after positioning range and distance correction, wherein the wall body combination with the smallest signal loss estimation is used as parameter correction distance measurement information so as to obtain the precise indoor positioning coordinate through calculation. By using the indoor positioning method and system provided by the invention, the fixed and unique building structure information in indoor environment is sufficiently used; the signal obtained through measurement is subjected to fitting according to different signal attenuation of different building materials of building structures and wall bodies; the optimum wall body combination with the smallest signal loss estimation error corresponding to each position region is found; the time delay information of wireless signal spreading interference by the wall body is obtained; the distance measurement value is thus corrected; the problem of low precision of the existing positioning algorithm due to blocking between various wall bodies in the indoor environment is solved. The method has the advantages that the complexity degree is proper, and the more precise positioning result in the indoor complicated environment can be obtained.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to positioning of a wireless sensor network, and in particular to an indoor positioning method and system. Background technique [0002] With the change of modern life style, there are more and more applications of indoor positioning, especially in prisons, firefighting and hospitals. Since indoor positioning is faced with a complex propagation environment, different room structures and differences in building materials will have an impact on signal propagation, and signal transmission through walls, diffraction, and refraction will cause non-line-of-sight NLOS errors. Therefore, the general direct positioning methods are not applicable. [0003] The traditional positioning method is to first estimate the distance between the mobile station and the base station, and then realize the estimation of the position information through some algorithms based on geometric mea...

AI Technical Summary

Problems solved by technology

[0005] However, some of the above methods have some disadvantages: 1. The indoor positioning method using inertial sensors needs to determine the initial position and initial direction of the indoor moving target, which has limitations.

2. Fingerprint positioning requires a lot of signal strength detection and storage, the portability is not strong, and the complex indoor environment will make the positioning accuracy not high

3. In the analysis of the NLOS error caused by the wall, only the influence of a single wall on the delay of the signal is considered, and the accuracy is poor

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