Patent ID: 6378367
Filing Date: 2002-04-30
Classification: A63B,F41B,F41C,G01S

Abstract:
A method of measuring the speed of a moving sports object comprising the steps of:providing a self-contained battery powered device that includes a transmitter/receiver, at least one antenna element, a transmission line connecting the at least one antenna element to the transmitter/receiver, a signal processor having an input connected to the transmitter/receiver, and an output annunciator having an input connected to the signal processor, positioning the at least one antenna element in close proximity to the path of the moving object; generating a Doppler signal proportional to the speed of the object by producing an RF signal with the transmitter/receiver, transmitting the RF signal to the antenna element and radiating the RF signal from the antenna element along the path of the moving object, reflecting the RF signal from the object, receiving the reflected signal with the antenna element, transmitting the reflected signal from the antenna element to the transmitter/receiver, and detecting the Doppler signal from the reflected signal with the transmitter/receiver; processing the detected Doppler signal with the signal processor and producing therefrom a digital representation of the speed of the object; and outputting the digital representation of the speed of the object with the annunciator.