Real-time positioning system and method based on geomagnetic information

Abstract

The invention provides a real-time positioning method based on geomagnetic information. According to the method, an area positioning model is established based on WiFi signals in a positioning area, a geomagnetic path positioning model is established based on the geomagnetic information, and the current position of a user is estimated according to the established two models. According to the method, starting from the angle of multimode fusion, with the advantages of the geomagnet, the WiFi signals and an acceleration sensor being combined, and with the geomagnet, of which the signals are relatively stable, being the main body, accurate positioning is carried out within the range of a local area; with the WiFi positioning, of which the coverage area is relatively wide and the positioning accuracy is relatively poor, being the assist, the local search range for geomagnetic positioning is limited; and the acceleration sensor is utilized to judge the state of the user and the movement distance so as to determine whether to use the geomagnetic positioning method and determine the length of the geomagnetic track path for geomagnetic track matched positioning, so that indoor high-precision, low-power-consumption and real-time positioning can be realized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a positioning system based on geomagnetic information. Background technique [0002] In recent years, with the increasing demand for location services, various wireless positioning technologies have developed rapidly. However, in the existing various indoor wireless positioning technologies, such as Bluetooth and RFID, infrastructure needs to be deployed, which limits the large-scale use of positioning technologies. Although the WiFi network has been deployed on a large scale at present, because the original intention of the WiFi network deployment is not for positioning applications, it is vulnerable to low receiving sensitivity, multipath effects, signal time-varying, and device differences when applying WiFi to positioning. Influenced by various factors, positioning performance has been difficult to improve. [0003] In recent years, the use of indoor geomagne...

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Problems solved by technology

[0004] However, the use of geomagnetic information for positioning faces many challenges, such as the fact that the information collected during the training phase has fewer dimensions and the accuracy of the collected information is low, the matching algorithm of the moving magnetic trajectory is complex, and the search calculations are large, etc.

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