Location based services for RFID and sensor networks
First Claim
1. A method for generating the location of one or more sensor tags expressed in a three-dimension global coordinate system from the location of the one or more sensor tags expressed in three-dimensional local coordinate systems of mobile reader agents that read each tag and for updating the paths of each mobile reader, the method comprising:
- receiving sensor data from one or more mobile reader agents;
receiving tag location data that describes the location of one or more sensor tags, each location of a sensor tag expressed in local coordinates of the subspace of the mobile reader agent that read the sensor tag, wherein the tag, location data that describes the location of one or more sensor tags is expressed as a quaternion in the form;
q=q0+q1i+q2j+q3k, where i, j, and k are imaginary numbers satisfying i2=j2=k2=ijk=−
1 with conjugate q2=q0−
q1i−
q2j −
q3k and |q|2=qqc;
converting the tag location data into a three-dimensional global coordinate system that is common to all mobile reader agents; and
updating one or more paths of one or more mobile reader agents to increase the coverage of reading tags in the subspace of the mobile reader agent.
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Abstract
Systems and methods for generating sensor tag locations expressed in a three-dimension global coordinate system from sensor tag locations expressed in three-dimensional local coordinate systems of mobile readers that read each tag and for updating the paths of each mobile reader are disclosed. In one embodiment, a method includes receiving sensor data from one or more mobile reader agents, receiving tag location data that describes the location of one or more sensor tags expressed in local coordinates of the subspace of the mobile reader agent that read the sensor tag, converting the tag location data into a global coordinate system that is common to all mobile reader agents, and updating one or more paths of one or more mobile reader agents to increase the coverage of reading tags in the subspace of the mobile reader agent.
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Citations
18 Claims
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1. A method for generating the location of one or more sensor tags expressed in a three-dimension global coordinate system from the location of the one or more sensor tags expressed in three-dimensional local coordinate systems of mobile reader agents that read each tag and for updating the paths of each mobile reader, the method comprising:
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receiving sensor data from one or more mobile reader agents; receiving tag location data that describes the location of one or more sensor tags, each location of a sensor tag expressed in local coordinates of the subspace of the mobile reader agent that read the sensor tag, wherein the tag, location data that describes the location of one or more sensor tags is expressed as a quaternion in the form;
q=q0+q1i+q2j+q3k, where i, j, and k are imaginary numbers satisfying i2=j2=k2=ijk=−
1 with conjugate q2=q0−
q1i−
q2j −
q3k and |q|2=qqc;converting the tag location data into a three-dimensional global coordinate system that is common to all mobile reader agents; and updating one or more paths of one or more mobile reader agents to increase the coverage of reading tags in the subspace of the mobile reader agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A sensor tag reader and location system for generating the location of one or more sensor tags expressed in a three-dimension global coordinate system from the location of the one or more sensor tags expressed in three-dimensional local coordinate systems of mobile readers that read each tag and for updating the paths of each mobile reader, the system comprising:
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a processor; and memory comprising an inventory and agent control application; wherein the processor is configured by the inventory and agent control application to; receive sensor data from one or more mobile reader agents; receive tag location data that describes the location of one or more sensor tags, each location of a sensor tag expressed in local coordinates of the subspace of the mobile reader agent that read the sensor tag, wherein the tag location data that describes the location of one or more sensor tags is expressed as a quaternion in the form;
q=q0+q1i+q2j+q3k, where i, j, and k are imaginary numbers satisfying i2=j2=k2=ijk=−
1 with conjugate q2=q0−
q1i−
q2j−
q3k and |q|2=qqc;convert the tag location data into a three-dimensional global coordinate system that is common to all mobile reader agents; and update one or more paths of one or more mobile reader agents to increase the coverage of reading tags in the subspace of the mobile reader agent. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification