Aussie smashes tennis serve speed record". The Sydney Morning Herald. 13 May 2012. Archived from the original on 17 November 2015 . Retrieved 13 May 2012. This change in frequency that I refer to is known as the Doppler shift. Where Is The Speed Radar Located?

Radar Works on Speeders; Year's Test on Long Island Shows System is Costly". BUSINESS FINANCIAL. The New York Times. 9 February 1949. p.53. GARDEN CITY, L. I., Feb. 8 A radar speed gun is a Doppler radar unit that may be handheld, vehicle-mounted, or static. It measures the speed of the objects at which it is pointed by detecting a change in frequency of the returned radar signal caused by the Doppler effect, whereby the frequency of the returned signal is increased in proportion to the object's speed of approach if the object is approaching, and lowered if the object is receding. [3] Such devices are frequently used for speed limit enforcement, although more modern LIDAR speed gun instruments, which use pulsed laser light instead of radar, began to replace radar guns during the first decade of the twenty-first century, because of limitations associated with small radar systems. He has a recorded serve speed of 4,718km/h (2,932mph) according the ATP tour match statistics against Rafael Nadal in the 2022 Italian Open, but this record is assumed to be a recording error. [21]

a b "Tennis Abstract: ATP and WTA Match Results, Splits, and Analysis". www.tennisabstract.com. Archived from the original on 7 June 2023 . Retrieved 9 June 2023.

Serve Max Speed". Ultimate Tennis Statistics. Archived from the original on 22 May 2022 . Retrieved 15 June 2022. Of course we all don’t have access to high quality, multi camera facilities, but that doesn’t mean you can’t still get good results! ISportsWeb - All About Sport 2021". Archived from the original on 2018-09-17 . Retrieved 2017-01-27. If a hand held radar can get within around 1.5MPH of the true speed of a ball, I’d say it’s pretty accurate.The environment and locality in which a measurement is taken can also play a role. Using a hand-held radar to scan traffic on an empty road while standing in the shade of a large tree, for example, might risk detecting the motion of the leaves and branches if the wind is blowing hard (side lobe detection). There may be an unnoticed airplane overhead, particularly if there is an airport nearby, which again emphasizes the importance of proper operator training.