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.
117 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