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Re: circular measure [was Re: Superman, was: Chicago P.D. TV series--computer usage] [message #392633 is a reply to message #392606] Wed, 01 April 2020 14:03 Go to previous messageGo to previous message
John Varela is currently offline  John Varela
Messages: 15
Registered: February 2012
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Junior Member
On Tue, 31 Mar 2020 19:26:48 UTC, Charlie Gibbs
<cgibbs@kltpzyxm.invalid> wrote:

> On 2020-03-31, John Varela <jv919a.nospam@gmail.com> wrote:
>
>> On Tue, 31 Mar 2020 03:28:55 UTC, Charlie Gibbs
>> <cgibbs@kltpzyxm.invalid> wrote:
>>
>>> On 2020-03-31, John Varela <jv919a.nospam@gmail.com> wrote:
>>>
>>>> Getting on topic: When I used to work with digitized radar data, the
>>>> circle was divided into 4096 Azimuth Pulse Units.
>>
>> OK, that was almost 60 years ago. It has come to me that they were
>> actually Azimuth Change Pulses. ACPs, not APUs. Produced in the
>> radar pedestal as the sail rotated. 4096 of them in a circle.
>>
>>> This discussion wouldn't be complete without mention of the "mil", which
>>> NATO defines as 1/6400 of a circle. Other jurisdictions use slightly
>>> different values, but they're all pretty close to one milliradian, i.e.
>>> arctan(1/1000). They're used in firearm sights.
>>
>> All that is after my time.
>
> Depends on where you were, I guess. The one time I encountered mils
> was at a militia camp in 1969.

I was only talking about digitized surveillance radar technology
that dates from the 1950s. Modern radars may have narrower beams
and use a finer azimuth measure; I wouldn't know about that.

--
John Varela
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