Apparatus for detecting moving ball
First Claim
Patent Images
1. A method for detecting coincidence between a position of an object and a linear boundary, comprising the steps of:
- providing a directional receiving antenna having at least two alternate antenna patterns having predetermined relation to an electromagnetic antenna boresight, said receiving antenna being positioned with said boresight in substantial alignment with said linear boundary;
emitting radio signals from said object;
receiving said radio signals on said at least two antenna patterns to provide first and second received signals;
and comparing said received signals to thereby detect coincidence between said object and said linear boundary.
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Abstract
A system is provided with a directional antenna having first and second antenna patterns oriented around an antenna boresight direction. The antenna boresight is oriented in a direction corresponding to a play determinative line on a playing field. Signals are emitted firm a playing object, used as a ball and detect using the two antenna patterns. Comparison of the detected signals provides an output indication when the playing object crosses the play determinative line.
110 Citations
13 Claims
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1. A method for detecting coincidence between a position of an object and a linear boundary, comprising the steps of:
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providing a directional receiving antenna having at least two alternate antenna patterns having predetermined relation to an electromagnetic antenna boresight, said receiving antenna being positioned with said boresight in substantial alignment with said linear boundary; emitting radio signals from said object; receiving said radio signals on said at least two antenna patterns to provide first and second received signals; and comparing said received signals to thereby detect coincidence between said object and said linear boundary.
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2. A system for detecting coincidence between a position of an object and a linear boundary, comprising:
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a directional receiving antenna having first and second signal output ports associated with first and second antenna patterns having predetermined relation to an electromagnetic boresight of said antenna, said boresight being aligned in predetermined relation to said linear boundary; a transmitter arranged to cause emission of radio signals from said object; and signal comparison circuits coupled to said first and second signal output ports for comparing signals received from said object by said receiving antenna to thereby determine coincidence between the position of said object and said linear boundary. - View Dependent Claims (3, 4, 5)
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6. Apparatus for detecting coincidence between a position of an object and a linear boundary, comprising:
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a directional receiving antenna having first and second signal output ports associated with first and second antenna patterns having predetermined relation to an electromagnetic boresight of said antenna, said boresight being aligned in predetermined relation to said linear boundary; a transmitter for illuminating said object with radio frequency radiation; a radio frequency reflector carried by said object to reflect radiation; and signal comparison circuits coupled to said first and second signal output ports for comparing reflected signals received from said object by said receiving antenna to thereby determine coincidence between the position of said object and said linear boundary. - View Dependent Claims (7)
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8. Apparatus for detecting coincidence between a position of an object and a linear boundary, comprising:
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a directional antenna for providing at least two antenna patterns having predetermined relation to an electromagnetic boresight of said antenna, said boresight being aligned in predetermined relation to said linear boundary; a transmitter and a receiver arranged for transmission of radio signals between said directional antenna and said object using said at least two antenna patterns; and signal comparison circuits for comparing signals received by said receiver corresponding to said at least two antenna patterns to thereby determine coincidence between the position of said object and said linear boundary.
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9. Apparatus for use in connection with a game having a linear boundary, comprising:
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a directional antenna having at least two alternate antenna patterns having predetermined relation to an electromagnetic boresight of said antenna; a transmitter and a receiver arranged for transmission of radio signals between said directional antenna and a playing object of said game using said at least two antenna patterns; and signal comparison circuits for comparing signals corresponding to said at least two antenna patterns to thereby determine angular position of said playing object with respect to said electromagnetic boresight; whereby when said antenna is oriented and located with said electromagnetic boresight in predetermined relation to said linear boundary, said comparison circuits determine the position of said playing object with respect to said linear boundary. - View Dependent Claims (10, 11, 12, 13)
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Specification