Motion tracking system and method
First Claim
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1. A method for tracking object movement, comprising the steps of:
- placing a plurality of sensors around a capture zone;
placing a stationary reference tag within the capture zone;
coupling at least one tag on at least one object to be tracked in the capture zone;
periodically transmitting signals from the reference tag and at least one object tag;
receiving the signals at the sensors;
determining code phase and carrier phase measurements for each signal received; and
processing the code phase and carrier phase measurements to determine the position of the at least one tag with respect to the reference tag.
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Abstract
A method for tracking objects within a three-dimensional capture zone includes placing at least four sensors around the capture zone. A stationery reference tag is placed within the capture zone. Tags are coupled to objects to be tracked in the capture zone. Signals are periodically transmitted from the reference and object tags. These signals are received and the identification code, and code phase and carrier phase measurements are extracted. The code phrase and carrier phase measurements are processed to determine the position of each object tag with respect to the reference tag at each sampling instant.
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Citations
29 Claims
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1. A method for tracking object movement, comprising the steps of:
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placing a plurality of sensors around a capture zone;
placing a stationary reference tag within the capture zone;
coupling at least one tag on at least one object to be tracked in the capture zone;
periodically transmitting signals from the reference tag and at least one object tag;
receiving the signals at the sensors;
determining code phase and carrier phase measurements for each signal received; and
processing the code phase and carrier phase measurements to determine the position of the at least one tag with respect to the reference tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for tracking object movement, comprising the steps of:
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placing at least four sensors around a capture zone;
placing a stationary reference tag having a unique identification code within the capture zone;
coupling a plurality of tags on at least one object to be tracked in the capture zone, each object tag having a unique identification code;
periodically transmitting signals from the reference tag and at least one object tag;
receiving the signals at the sensors;
processing the signals to extract the identification code, code phase and carrier phase measurements for each signal received using digital matched filters;
forming single difference measurements for each object tag measurement and reference tag measurement;
determining the position of the at least one object tag with respect to the reference tag by forming double difference measurements, including pair wise differencing the single difference measurements from different sensors relating to the same object tag, and combing the double difference measurements. - View Dependent Claims (19, 20, 21, 22, 23, 25, 26, 27, 28, 29)
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24. The method of claim 24, wherein the tags transmit in approximately the 5.8 Ghz band range, the 60 GHz band range, or the 2.4 GHz band range.
Specification