Through-the-wall magnetoquasistatic positioning
First Claim
1. A method comprising:
- providing at least one transmitter configured to transmit a magnetoquasistatic field, the at least one transmitter comprising at least two coils orthogonal to each other, the at least two coils each having, during operation, an equivalent magnetic moment parallel to a horizontal plane formed by a y axis and an x axis, the y axis being perpendicular to a surface of an external wall of a building, and the x axis being orthogonal to the y axis and parallel to the surface of the external wall;
providing at least one receiver configured to detect the magnetoquasistatic field,the at least one receiver being located outside the building;
transmitting, through the external wall, the magnetoquasistatic field with the at least one transmitter;
measuring, through the wall, the magnetoquasistatic field with the at least one receiver;
approximating the building as a homogeneous conducting body for penetration of the magnetoquasistatic field;
decoupling a range and orientation of the at least one transmitter relative to the at least one receiver; and
based on the approximating and decoupling, measuring a first coordinate position, along the y axis, between the at least one transmitter and the external wall, and a second coordinate position, along the x axis, for the at least one transmitter.
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Accused Products
Abstract
Magnetoquasistatic through-the-wall non-line-of-sight coupling between a mobile transmitting device located within a building, or indoor, and a fixed receiving device located outside the building, outdoor, enables positioning of the transmitting device through the wall of the building and in non-line-of-sight environments. Systems based on magnetoquasistatic coupling can separately sense the distance and orientation of the transmitting device accurately even in heavy non-line-sight environments such as steel-reinforced buildings. The approach permits sensing and determination of location and attitude of mobile devices in buildings and can be used to locate rescue workers, first responders, or law enforcement officers inside a building.
11 Citations
20 Claims
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1. A method comprising:
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providing at least one transmitter configured to transmit a magnetoquasistatic field, the at least one transmitter comprising at least two coils orthogonal to each other, the at least two coils each having, during operation, an equivalent magnetic moment parallel to a horizontal plane formed by a y axis and an x axis, the y axis being perpendicular to a surface of an external wall of a building, and the x axis being orthogonal to the y axis and parallel to the surface of the external wall; providing at least one receiver configured to detect the magnetoquasistatic field, the at least one receiver being located outside the building; transmitting, through the external wall, the magnetoquasistatic field with the at least one transmitter; measuring, through the wall, the magnetoquasistatic field with the at least one receiver; approximating the building as a homogeneous conducting body for penetration of the magnetoquasistatic field; decoupling a range and orientation of the at least one transmitter relative to the at least one receiver; and based on the approximating and decoupling, measuring a first coordinate position, along the y axis, between the at least one transmitter and the external wall, and a second coordinate position, along the x axis, for the at least one transmitter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification