TrackMan 4 has almost three times greater distance between the receivers than any other manufacturer of sports radars currently on the market. The further the distance between the receiving antennas, the higher the accuracy of the angular measurement. This is done by having multiple receiving antennas, measuring the time delay time to each of the receivers. Measuring angles and distancesįor every detected Doppler frequency corresponding to a moving object (golf club head or golf ball), the vertical and horizontal angles can be determined. All sports where spin rate is one of the key metrics for controlling ball flight and ground impact behavior. Because of the accuracy and robustness of the spin rate measurement principle, TrackMan uses this method to determine spin rate of all kinds of sports balls, including baseball, tennis ball, cricket ball, football/soccer ball, and, of course, the golf ball. The spin rate measuring principle does not rely on any markers on the ball or knowledge of ball diameter etc. It turns out that the range of velocities is not continuous but has discrete components being harmonics of the spin frequency and symmetrically arranged around the ball velocity in the Doppler spectrum.
This means that the Doppler radar does not only see one velocity of a flying spinning golf ball, but a range of velocities. The accuracy is within 20 rpm.Ĭonsider a golf ball launched with backspin and illuminated by a Doppler radar positioned behind the golfer the top of the golf ball will move towards the radar compared to the center of the ball, and the bottom of the golf ball will move away from the radar compared to the center of the ball. TrackMan’s patented method of measuring the spin rate by using the Doppler radar signature of a spinning ball has been confirmed by various research projects/institutes to be state-of-the-art. For high speed drives the difference of just a couple of 100 rpm’s have a noticeable influence on the ball flight and carry/total distance. The spin rate of a golf ball has a massive impact on the ball flight as well as how the ball behaves once it impacts the ground. It is exactly the same principle which explains why the audio frequency of an ambulance siren approaching is at a higher frequency compared to when the ambulance is moving away from you. The change in frequency is linearly proportional with the speed of the moving object relative to the signal receiver and transmitter. TrackMan is using the Doppler principle, which explains why a signal bouncing off a moving object like a golf club or ball will change the frequency of the signal. Similarly, the ball’s speed direction – which is measured immediately after launch – offers the same advantages for TrackMan in determining the Launch Angle and Launch Direction. Essential club data like Attack Angle and Club Path represent the direction of speed of the club head at impact.Ī direct measurement of the speed, which is done by TrackMan through use of Doppler radar, offers a technical advantage in assuring accurate data. Speed is an absolute cornerstone for obtaining accurate club delivery and ball launch data.
TrackMan’s Doppler radar technology directly measures speed. Tech Story 4 Measuring speed: The one thing you shouldn’t calculate
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