| 摘要 |
<p>A sensor (10, 110, 210, 310, 410, 510) is provided for measuring the speed o f a moving sports object, for example, a ball such as a baseball (16) or softball. The sensor is operable over a short range and is preferably mounte d in close proximity to the path of the moving object. For measuring the speed of a ball, the sensor is preferably mounted on or in a ball glove (14) or is otherwise mounted on the forearm of a person catching or otherwise receiving or interacting with the ball, for example, by wearing the sensor on such person's wrist. The sensor of the preferred embodiment utilizes CW Doppler radar in the form of a microwave radio frequency transmitter and receiver th at has a single-transistor integrated antenna/oscillator.</p> |
