a sensor is provided for measuring the speed of a moving sport object , for example , from a gun , bow or other implement , such as a bullet or paint ball or arrow . the sensor is operable over a short range and is preferably mounted in close proximity to the path of the moving object preferably utilizes cw doppler radar of a microwave radio frequency . in use , the unit is situated so as to place a transmit / receive antenna close to or in the line of motion of the object . such an antenna , so positioned , may be separated from the unit and connected through a transmission line . the remote display / annunciator can also or in the alternative be separated and located remote from the transmitter / receiver and connected by a cable or a wireless link . the sensor is useful for other speed measurements in sports applications , such as for measurement of bat speed , golf club head speed or the speed of another racket , club or bat type implement , or to measure punch or kick speed in martial arts .