| 摘要 |
<p>A sensor device (10) is provided for measuring the speed of a moving sports object, for example a ball (16) such as a baseball or softball. The sensor is operable over a short range and is preferably mounted 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 (11) of a person catching or otherwise receiving or interacting with the ball, for example, by wearing the sensor on such person's wrist (13). The sensor measures the speed of a ball about to be caught, for exemple, and displays the speed of the ball on a display (22) to the catching player. The sensor of the preferred embodiment utilizes CW Doppler radar in the form of a microwave radio frequency transmitter and receiver (33) that has a single-transistor integrated antenna/oscillator (50). A simple, battery powered low cost unit having a low radiation and low energy consumption transmitter, receiver and signal processor, is provided.</p> |
