Method for tracking the location of mobile units
First Claim
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1. A method for tracking the location of mobile units, comprising the steps of:
- providing a plurality of mobile units each having a wireless transmitter and a unique address and at least one stationary base unit having a phase array antenna with antenna elements;
receiving a signal including an address from at least one mobile unit at the at least one base unit via the phase array antenna;
measuring the phase difference of the signal arriving at the antenna elements of the phase array antenna from each mobile unit; and
calculating the coordinates of the location of each mobile unit as a function of the phase difference.
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Abstract
A method for tracking the location of mobile units, comprises providing a plurality of mobile units each having a wireless transmitter and a unique address and at least one stationary base unit having a phase array antenna with antenna elements. A signal including an address is received from at least one mobile unit by the at least base unit via the phase array antenna. The phase difference of the signal arriving at the antenna elements from each mobile unit is measured and the coordinates of the location of each mobile unit are calculated as a function of the phase differences.
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Citations
16 Claims
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1. A method for tracking the location of mobile units, comprising the steps of:
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providing a plurality of mobile units each having a wireless transmitter and a unique address and at least one stationary base unit having a phase array antenna with antenna elements;
receiving a signal including an address from at least one mobile unit at the at least one base unit via the phase array antenna;
measuring the phase difference of the signal arriving at the antenna elements of the phase array antenna from each mobile unit; and
calculating the coordinates of the location of each mobile unit as a function of the phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16)
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12. A method for calibrating a system for tracking the location of mobile units, comprising the steps of:
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providing at least one stationary base unit having a phase array antenna having antenna elements for receiving signals from a plurality of mobile wireless transmitter units and at least one reference wireless transmitter disposed at a fixed location and having a unique identifying address;
receiving a signal including an address from the at least one reference transceiver at the at least one base unit via the phase array antenna;
measuring the phase difference between the signal arriving at each antenna element from the at least one reference transmitter;
calculating the coordinates of the location of the at least one reference transmitter; and
correcting future calculations by the difference between the calculated coordinates of the at least one reference transmitter and the actual location of the at least one reference transmitter.
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Specification