Indoor magnetic field based location discovery
First Claim
1. An apparatus, comprising:
- at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to;
acquire an initial location estimate of a positioning device that is to determine its location inside a building, wherein the location estimate is acquired on the basis of an indoor non-magnetic field based location discovery system;
access an indoor Earth'"'"'s magnetic field, EMF, map for a plurality of floors of buildings, wherein the indoor EMF map represents magnitude and direction of the Earth'"'"'s magnetic field affected by the local structures of a corresponding building;
select at least one sub-part of the indoor EMF map on the basis of the acquired initial location estimate of the positioning device, wherein the at least one sub-part of the indoor EMF map selected is an area of the indoor EMF map corresponding to the acquired initial location estimate; and
perform at least one of the following;
provide, on request, the selected at least one sub-part of the indoor EMF map to the positioning device in order to allow the positioning device to use the selected at least one sub-part of the indoor EMF map in locating itself;
oracquire at least one measured EMF vector value from the positioning device, and apply the at least one measured EMF vector value and the selected at least one sub-part of the indoor EMF map in an indoor EMF map-based location determination of the positioning device.
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Accused Products
Abstract
There is provided an apparatus, wherein the apparatus is caused to acquire a location estimate of a positioning device that is to determine its location inside a building, wherein the location estimate is acquired on the basis of an indoor non-magnetic field based location discovery system; access an indoor Earth'"'"'s magnetic field, EMF, map of plurality of buildings, wherein the indoor EMF map represents at least one of magnitude and direction of the Earth'"'"'s magnetic field affected by the local structures of a corresponding building; and select a part of the indoor EMF map on the basis of the location estimate of the positioning device, wherein the selected part of the indoor magnetic field map includes the indoor EMF map for the area in which the positioning device currently is.
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Citations
19 Claims
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1. An apparatus, comprising:
at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to; acquire an initial location estimate of a positioning device that is to determine its location inside a building, wherein the location estimate is acquired on the basis of an indoor non-magnetic field based location discovery system; access an indoor Earth'"'"'s magnetic field, EMF, map for a plurality of floors of buildings, wherein the indoor EMF map represents magnitude and direction of the Earth'"'"'s magnetic field affected by the local structures of a corresponding building; select at least one sub-part of the indoor EMF map on the basis of the acquired initial location estimate of the positioning device, wherein the at least one sub-part of the indoor EMF map selected is an area of the indoor EMF map corresponding to the acquired initial location estimate; and perform at least one of the following; provide, on request, the selected at least one sub-part of the indoor EMF map to the positioning device in order to allow the positioning device to use the selected at least one sub-part of the indoor EMF map in locating itself;
oracquire at least one measured EMF vector value from the positioning device, and apply the at least one measured EMF vector value and the selected at least one sub-part of the indoor EMF map in an indoor EMF map-based location determination of the positioning device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus, comprising:
at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause a positioning device at least to; acquire information related to an initial location estimate of the positioning device in a building from an indoor non-magnetic field based location discovery system; cause a transmission of the acquired information related to the initial location estimate to a database entity; cause a reception of at least one sub-part of an indoor Earth'"'"'s magnetic field, EMF, map of the building, wherein the received at least one sub-part of the indoor EMF map is selected on the basis of the initial location estimate of the positioning device, and the at least one sub-part of the indoor EMF map selected is an area of the indoor EMF map corresponding to the acquired initial location estimate; and acquire at least one measured EMF vector value; and apply the at least one measured EMF vector value and the received at least one sub-part of the indoor EMF map in an indoor EMF map-based location determination of the positioning device in the building.
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19. An apparatus, comprising:
at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause a positioning device at least to; acquire information related to an initial location estimate of the positioning device in a building from an indoor non-magnetic field based location discovery system; cause a transmission of the acquired information related to the initial location estimate to a database entity; cause a transmission of at least one measured magnetic field vector value to the database entity in order to enable the database entity to determine a location of the positioning device on the basis of the received at least one measured magnetic field vector value and an indoor EMF map stored in the database entity, a selected part of the indoor EMF map corresponding to the acquired initial location estimate; and cause a reception of the determined location of the positioning device from the database entity.
Specification