Low frequency asset tag tracking system and method
First Claim
1. A system for tracking an asset having three overall dimensions comprising a length, width, and height, said system comprising:
- a transmitter for transmitting a tracking signal, said tracking signal having a wavelength greater than at least one overall dimension of the asset;
a tracking receiver for receiving properties of the tracking signal;
a processing unit for evaluating said properties of the tracking signal, said properties being used to determine the position of the transmitter.
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Accused Products
Abstract
An apparatus and method for low frequency asset tracking includes a low frequency transmitter tag associated with a cargo container or other high value commodity, a plurality of receivers that detect low frequency signals, and a microprocessor that uses algorithms and/or data pertaining to the propagation characteristics of the signal to locate the position of the container or high value commodity. The tag may include sensors to monitor container properties or conditions, such as temperature, motion, intrusion, RF fields, or other properties of interest. Sensor data may be modulated on the low frequency transmitter signal.
144 Citations
20 Claims
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1. A system for tracking an asset having three overall dimensions comprising a length, width, and height, said system comprising:
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a transmitter for transmitting a tracking signal, said tracking signal having a wavelength greater than at least one overall dimension of the asset;
a tracking receiver for receiving properties of the tracking signal;
a processing unit for evaluating said properties of the tracking signal, said properties being used to determine the position of the transmitter. - View Dependent Claims (2, 3, 4)
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5. A system for tracking an asset having three overall dimensions comprising a length, width, and height, said system comprising:
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a transmitter for transmitting a tracking signal, said tracking signal having a wavelength greater than at least one overall dimension of the asset;
a tracking receiver for receiving at least two properties of the tracking signal;
a processing unit for comparing said at least two properties of the tracking signal, said properties being used to determine the position of the transmitter. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for tracking an asset comprising the steps of:
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transmitting a tracking signal, said tracking signal having a wavelength greater than at least one overall dimension of the asset;
receiving at least two properties of the tracking signal;
comparing said at least two properties of the tracking signal, said properties being used to determine the position of the transmitter.
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18. A system for communicating data, said data associated with an asset, said system comprising:
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a transmitter for transmitting a signal modulated with said data, said signal having a wavelength greater than at least one dimension of the asset;
a receiver for receiving at least two properties of the signal;
a processing unit for comparing said at least two properties of the signal, said properties being used to determine the position of the transmitter;
a demodulator for demodulating said data from said signal;
- View Dependent Claims (19)
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20. A system for communicating data from a confined space comprising
a transmitter for transmitting a signal modulated with said data, said signal having a wavelength greater than at least one dimension of said confined space; -
a receiver for receiving at least two properties of the signal;
a processing unit for comparing said at least two properties of the signal;
said properties being used to determine the position of the transmitter;
a demodulator for demodulating said data from said signal.
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Specification