Athletic performance monitoring systems and methods in a team sports environment
First Claim
1. A method for determining a distance between a player and a ball in a game, the method comprising:
- starting transmission of a sweep signal to a radio tag on the ball, a sweep frequency of the sweep signal changing in accordance with a predetermined pattern;
simultaneously receiving a return signal from the radio tag while transmitting the sweep signal;
comparing a received frequency of the return signal with a current sweep frequency to obtain a frequency difference;
estimating the distance between the player and the ball from the frequency difference; and
determining when to start the sweep signal to reduce interference by another transceiver, the other transceiver associated with another player.
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Accused Products
Abstract
Systems, apparatuses, and methods estimate the distance between a player and a ball by transmitting a chirp (sweep signal) to a radio tag located on the ball. During the chirp, the frequency of the transmitted signal is changed in a predetermined fashion. The radio tag doubles the transmitted frequency and returns the processed signal to a transceiver typically located on the player. The currently transmitted frequency is then compared with the received frequency to obtain a difference frequency from which an apparatus may estimate the distance. The apparatus may simultaneously receive the processed signal from the radio tag while transmitting the sweep signal.
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Citations
13 Claims
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1. A method for determining a distance between a player and a ball in a game, the method comprising:
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starting transmission of a sweep signal to a radio tag on the ball, a sweep frequency of the sweep signal changing in accordance with a predetermined pattern; simultaneously receiving a return signal from the radio tag while transmitting the sweep signal; comparing a received frequency of the return signal with a current sweep frequency to obtain a frequency difference; estimating the distance between the player and the ball from the frequency difference; and determining when to start the sweep signal to reduce interference by another transceiver, the other transceiver associated with another player. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A tangible computer-readable medium containing computer-executable instructions that when executed cause and apparatus to perform the steps comprising:
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starting transmission of a sweep signal to a radio tag on the ball, a sweep frequency of the sweep signal changing in accordance with a predetermined pattern; simultaneously receiving a return signal from the radio tag while transmitting the sweep signal; comparing a received frequency of the return signal with a current sweep frequency to obtain a frequency difference; estimating the distance between the player and the ball from the frequency difference; and determining when to start the sweep signal to reduce interference by another transceiver, the other transceiver associated with another player. - View Dependent Claims (11, 12, 13)
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Specification