Calibration of a location system
First Claim
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1. A location system comprising:
- a plurality of base units at known locations for enabling the locating of a device by means of one or more location signals communicated between the device and the base units; and
signal processing equipment configured to;
(i) determine the location of the device in dependence on the time-difference-of-arrival and angle-of-arrival of the location signal(s) as received by the base units; and
(ii) derive calibration data for calibrating the clocking of each base unit from the time-difference-of-arrival and angle-of-arrival of the location signal(s) as received by the base units, whereinthe signal processing unit is configured to derive the calibration data independently of any reference timing generator that is external to a subsystem consisting of the plurality of base units and the device, andthe calibration data defines a timing offset in the clocking of each base unit relative to a reference clock.
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Abstract
A location system comprising a plurality of base units for enabling the locating of a device by means of one or more location signals communicated between the device and the base units and signal processing equipment for: i. determining the location of the device in dependence on the manner in which the location signal(s) is/are received and ii. deriving calibration data for calibrating the system in dependence on the manner in which the location signal(s) is/are received.
80 Citations
19 Claims
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1. A location system comprising:
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a plurality of base units at known locations for enabling the locating of a device by means of one or more location signals communicated between the device and the base units; and signal processing equipment configured to; (i) determine the location of the device in dependence on the time-difference-of-arrival and angle-of-arrival of the location signal(s) as received by the base units; and (ii) derive calibration data for calibrating the clocking of each base unit from the time-difference-of-arrival and angle-of-arrival of the location signal(s) as received by the base units, wherein the signal processing unit is configured to derive the calibration data independently of any reference timing generator that is external to a subsystem consisting of the plurality of base units and the device, and the calibration data defines a timing offset in the clocking of each base unit relative to a reference clock. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for locating a device in a location system comprising the device and a plurality of base units at known positions for enabling the locating of the device, the method comprising the steps of:
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communicating one or more location signals between the device and the base units; determining the location of the device in dependence on the time-difference-of-arrival and angle-of-arrival of the location signal(s) as received by the base units; and deriving calibration data for calibrating the clocking of each base unit from the time-difference-of-arrival and angle-of-arrival of the location signal(s) as received by the base units, wherein the calibration data is derived independently of any reference timing generator external to a subsystem consisting of the base units and the device, and the calibration data defines a timing offset in the clocking of each base unit relative to a reference clock. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification