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# 239805 5-Aug-2018 14:23
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I'm guessing they use something like a police radar gun? But then how would it know to only grab the speed of the ball and not the bowler's arm or the batter's swinging of the bat etc.? And it would also have to depend on the angle the gun is placed at etc too would it not?




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  # 2068253 5-Aug-2018 14:41
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Yep it's radar, and presumably it tracks speed based on measuring distance as it travels the 22 yards which would allow it to differentiate from all the other signals.

 

I do know that golf ball tracking devices like https://trackmangolf.com/ use doppler radar from missile tracking technology:

 

https://medium.com/@andrewtoshmorgan/golf-and-militarys-surprising-relationship-a8460cd88fc7

 

 


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  # 2068295 5-Aug-2018 16:57
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It would be the fastest thing that a dopler would see so should be easy to pick it out.




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  # 2068361 5-Aug-2018 22:22
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It would have a degree of error to the measurement since the ball is released at the top of the swing but is aimed at the bowler's legs (usually, sometimes the head!) so assuming the radar is aimed horizontally from the edge of the area of play there's going to be a cosine error.


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  # 2068420 6-Aug-2018 06:29
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They also have Hawkeye, which can measure trajectory etc.

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  # 2068424 6-Aug-2018 07:37
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They use the one Mississippi, two Mississippi......ouch method




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  # 2068425 6-Aug-2018 07:47
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AFAIK, they try to measure the horizontal speed when it leaves the bowlers hand so they get the fastest speed before air resistance immediately starts to slow it down and other factors become more significant: fall (vertical displacement), swing (horizontal displacement), impact with the ground.


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