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 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 a 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;
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; and
adjust the acquired location estimate further on the basis of at least one of a topology or layout of the building in which the positioning device is and a detected identity of the positioning device.
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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.
27 Citations
19 Claims
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1. An apparatus, comprising:
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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 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 a 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; 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; and adjust the acquired location estimate further on the basis of at least one of a topology or layout of the building in which the positioning device is and a detected identity 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:
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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 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 a 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; 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; and identify, on the basis of the location estimate, a floor of a multi-story building in which the positioning device currently is, wherein the selected part of the indoor EMF map includes the indoor EMF map for the identified floor of the multi-story building, and the selected part of the indoor EMF map includes the indoor EMF map for the identified floor of the multi-story building and in addition the indoor EMF map for a predetermined number of adjacent floors.
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19. An apparatus, comprising:
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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 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 a 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; 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; detect the current location of the positioning device in the building, wherein the current location is known on the basis of at least part of the indoor EMF map and magnetic field vector measurements performed by the positioning device; acquire at least one measurement parameter value related to the indoor non-magnetic field based location discovery system at the detected current location of the positioning device; apply the acquired at least one measurement parameter value for an update of a map of the indoor non-magnetic field based location discovery system; and perform an update of a radio map on the basis of the acquired at least one measurement parameter value, wherein the at least one measurement parameter value comprises received signal strength of radio frequency signals.
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Specification