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Re: navigation math

From Grant Edwards <invalid@invalid.invalid>
Newsgroups comp.arch.embedded
Subject Re: navigation math
Date 2021-11-19 23:03 +0000
Organization PANIX Public Access Internet and UNIX, NYC
Message-ID <sn9afp$1gm$2@reader1.panix.com> (permalink)
References <sn91dl$6ul$1@reader1.panix.com> <sn99v1$1gm$1@reader1.panix.com>

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On 2021-11-19, Grant Edwards <invalid@invalid.invalid> wrote:
> On 2021-11-19, Hul Tytus <ht@panix.com> wrote:
>
>> Anyone know the method for calculating a reciever's position from the time 
>> difference between three rf pulse transmiters of known positions?
>
> Yes. If you know the delta between the distances to two known
> locations, that places you on a hyperbola whose focii are those two
> known points. Plot the hyperbola on your map.

Actually coastal navigational maps had/have those LORAN hyperbolas
printed on them. So all you really had to do was read the delta value
off the receiver, and then interpolate between two lines with
dividers... rinse, repeat.

https://www.penobscotmarinemuseum.org/pbho-1/collection/loran-lines-penobscot-bay-chart

Modern LORAN receivers know where the transmitters are, do all the
math internally, and just show you longitude/lattitude or display a
map just like a GPS receiver.

--
Grant

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navigation math Hul Tytus <ht@panix.com> - 2021-11-19 20:28 +0000
  Re: navigation math Dennis <dennis@none.none> - 2021-11-19 16:12 -0600
    Re: navigation math Hul Tytus <ht@panix.com> - 2021-11-20 20:45 +0000
  Re: navigation math Grant Edwards <invalid@invalid.invalid> - 2021-11-19 22:54 +0000
    Re: navigation math Grant Edwards <invalid@invalid.invalid> - 2021-11-19 23:03 +0000
    Re: navigation math Don Y <blockedofcourse@foo.invalid> - 2021-11-19 16:28 -0700
    Re: navigation math Hul Tytus <ht@panix.com> - 2021-11-20 20:50 +0000
  Re: navigation math Don Y <blockedofcourse@foo.invalid> - 2021-11-19 16:19 -0700
    Re: navigation math Hul Tytus <ht@panix.com> - 2021-11-20 20:55 +0000
      Re: navigation math Don Y <blockedofcourse@foo.invalid> - 2021-11-20 15:38 -0700
  Re: navigation math Paul Rubin <no.email@nospam.invalid> - 2021-11-19 18:17 -0800
    Re: navigation math Hul Tytus <ht@panix.com> - 2021-11-20 20:59 +0000
  Re: navigation math Robert Roland <fake@ddress.no> - 2021-11-20 14:27 +0100

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