UTILIZING MAGNETIC FIELD BASED NAVIGATION

摘要

There is provided a solution comprising detecting that a positioning device is within a predetermined control area associated with a building, acquiring a first sequence of magnetic field measurements carried out by the positioning device, wherein the first sequence represents at least one of the magnitude and the direction of Earth's magnetic field; determining that an operational environment of the positioning de-vice has changed between an indoor environment and an outdoor environment when a at least one predetermined criterion with respect to the first sequence is met; and causing actuation of a predetermined software function in or with respect to the positioning device when the operational environment of the positioning device has changed.

主权项

1. An indoor location estimation and/or tracking system, comprising a mobile apparatus and a database server, each comprising at least one processor and at least one memory including a computer program code, wherein the respective at least one memory and the respective computer program code are configured, with the respective at least one processor, to cause the respective apparatus to perform specific actions,
wherein the mobile apparatus is caused to:
perform Earth's magnetic field, EMF, vector measurements in a building, wherein the EMF vector represents magnitude and direction of the earth's magnetic field affected by the local structures of the building; andwirelessly transmit the measured EMF vectors to the database server wirelessly, wherein the database server stores an indoor EMF map comprising EMF vector strength and direction at any given location in the building, and wherein the database server is caused to:
determine a location estimate of the mobile apparatus in the building based on the received EMF vectors and the indoor EMF map, wherein a bias and/or a scaling factor has been used to correct the EMF vector; andcommunicate the location estimate to the mobile apparatus.