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Re: Radar ranging and relativity

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On 18-Mar-23 2:12 pm, Richard Hertz wrote:
> On Saturday, March 18, 2023 at 12:01:26 AM UTC-3, Sylvia Else wrote:
>> On 18-Mar-23 3:45 am, Richard Hertz wrote:
>>> Why the popularized equation for radar ranging is:
>>>
>>> R = 1/2 t c₀
>>>
>>> https://www.radartutorial.eu/01.basics/Distance-determination.en.html
>> For a target, moving or otherwise, it gives the distance to the target
>> at the point where the radar signal was reflected, which happens after
>> half of the total transit time. The velocity of the target is irrelevant.
>>
>> Sylvia.
> 
> This is the basic theory for radar ranging, taught to kids in high school.
> 
> I wrote the OP in order to show the DISINFORMATION that plagues the web, being in this case from a "serious" site.
> 
> Since the 60s, radar ranging is complemented with Doppler measurement, in a single frequency swept pulse, and even
> better techniques.
> 
> Since the 90s, phased array radars are used along with computes, to acquire targets in a 3D space with resolutions of meters.
> 
> Imagine a Patriot system trying to hit a 5,000 Km/hr incoming missile (or 20,000 Km/Hr for ICBM).
> 
> The real position is tracked in real time. No turning antennae anymore.
> 

That has nothing to do with your earlier claim that the correct equation 
involved the velocity of the target.

Sylvia.

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Radar ranging and relativity Richard Hertz <hertz778@gmail.com> - 2023-03-17 09:45 -0700
  Re: Radar ranging and relativity Richard Hertz <hertz778@gmail.com> - 2023-03-17 10:21 -0700
  Re: Radar ranging and relativity "Dono." <eggy20011951@gmail.com> - 2023-03-17 19:03 -0700
    Re: Radar ranging and relativity Richard Hertz <hertz778@gmail.com> - 2023-03-17 19:51 -0700
      Cretin Richard Hertz at work "Dono." <eggy20011951@gmail.com> - 2023-03-17 21:17 -0700
  Re: Radar ranging and relativity "Dono." <eggy20011951@gmail.com> - 2023-03-17 19:48 -0700
    Re: Radar ranging and relativity whodat <whodaat@void.nowgre.com> - 2023-03-17 22:02 -0500
  Re: Radar ranging and relativity Sylvia Else <sylvia@email.invalid> - 2023-03-18 14:01 +1100
    Re: Radar ranging and relativity Richard Hertz <hertz778@gmail.com> - 2023-03-17 20:12 -0700
      Re: Radar ranging and relativity whodat <whodaat@void.nowgre.com> - 2023-03-17 22:29 -0500
        Re: Radar ranging and relativity Richard Hertz <hertz778@gmail.com> - 2023-03-18 05:44 -0700
      Re: Radar ranging and relativity Sylvia Else <sylvia@email.invalid> - 2023-03-18 15:08 +1100
      Re: Radar ranging and relativity Volney <volney@invalid.invalid> - 2023-03-19 00:31 -0400
        Re: Radar ranging and relativity whodat <whodaat@void.nowgre.com> - 2023-03-18 23:49 -0500
        Re: Radar ranging and relativity Maciej Wozniak <maluwozniak@gmail.com> - 2023-03-19 00:20 -0700
  Re: Radar ranging and relativity "mitchr...@gmail.com" <mitchrae3323@gmail.com> - 2023-03-18 12:49 -0700
    Re: Radar ranging and relativity Richard Hertz <hertz778@gmail.com> - 2023-03-18 13:33 -0700
      Re: Radar ranging and relativity "Dono." <eggy20011951@gmail.com> - 2023-03-18 16:14 -0700
  Re: Radar ranging and relativity "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2023-03-21 22:24 +0100

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