They track the ball for up to several hundred yards, as I showed. I have some fairly good ties to FlightScope, too, though I won't get into that because it's irrelevant - the facts of the matter will speak for themselves here.
I think you misread that part, or I wasn't very clear. I said that the unit tracks the ball until something prevents it from tracking it, then it extrapolates the remainder of the flight. Often a student steps in front of it (and they begin extrapolating). Once I saw a ball collide with another 150 yards down-range, and the unit extrapolated from there. It didn't keep tracking it.
I feel like you're not quite reading what I wrote: they track the ball until something prevents them from tracking the ball (hitting another ball, a net, a bird, a range sign, etc.), and then the flight is extrapolated from there. But if you're outdoors, the thing can track the ball for hundreds of yards. Way, way more than 4-5 feet from impact.
Yes. It's extrapolating. But it's probably measuring until the 150 yard sign is hit, and then it extrapolates from there.
The numbers you supplied can be hard crunched calculations based on launch, spin velocity etc. Trackman nor flightscope are no simple radar only devices like what the police use, but they use a multitude of sonar, radar and advanced algorithms and mathematical calculations. A vast majority of these flightscopes are used indoors, especially here in the northeast.
That doesn't really speak to what I've said.
You said the ball isn't tracked once it leaves a window 4-5 feet from impact. That is wrong. Perhaps you confused when the clubhead is tracked or something… but the ball is often tracked for hundreds of yards (assuming of course it travels hundreds of yards :D).
P.S. We have used TrackMan and FlightScope indoors and still use almost every day a FS. They need about 10-12 feet of flight at a minimum, and do better with longer flights. We can get about 30 feet and it works quite well. It measures for 30 feet, until the ball hits the net, and then it begins extrapolating. You can't get good numbers at all if you have a net 4-5 feet from where you hit the ball.