Magnetically modulated location system
First Claim
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1. A location system characterized by a magnetically modulated signal comprising;
- a transmitter comprising a means for generating a magnetically modulated signal;
a receiver comprising a magnetometer to sense the magnetically modulated signal such that a range from the transmitter to the receiver is estimated based upon the sensing of the magnetometer.
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Abstract
A method and apparatus for a magnetic field dipole based transmitter and magnetic field sensor receiver to detect and/or determine the position and/or orientation of a user'"'"'s receiver; in some embodiments accuracy to less than one foot is achievable; in some embodiments a receiver is located in a cellular phone. An exemplary communications protocol for a location network service is disclosed.
61 Citations
20 Claims
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1. A location system characterized by a magnetically modulated signal comprising;
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a transmitter comprising a means for generating a magnetically modulated signal; a receiver comprising a magnetometer to sense the magnetically modulated signal such that a range from the transmitter to the receiver is estimated based upon the sensing of the magnetometer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for a receiver of a location system characterized by a transmitter transmitting a magnetically modulated signal to determine the location of the receiver relative to the transmitter comprising the steps:
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sensing the receiver'"'"'s magnetic field comprising the transmitted magnetically modulated signal; applying a frequency conversion algorithm to the sensed magnetic field data such that frequency components of the magnetically modulated signal are identified; solving for location data; and communicating the location data. - View Dependent Claims (9, 10, 11)
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12. A location system characterized by a magnetically modulated signal comprising:
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a transmitter comprising a first means for generating a magnetically modulated signal at a first frequency such that information may be encoded in the magnetically modulated signal; and a receiver comprising a first magnetometer sensor operable to sense the magnetically modulated signal and a means for communicating the strength of the magnetically modulated signal to a processor wherein the distance from the receiver to the transmitter is estimated by the strength of the magnetically modulated signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification