[time-nuts] Loran in the US

Azelio Boriani azelio.boriani at screen.it
Mon Mar 5 09:59:43 UTC 2012


I agree.

On Mon, Mar 5, 2012 at 10:24 AM, Poul-Henning Kamp <phk at phk.freebsd.dk>wrote:

> In message <F5C81892-7EBD-4F57-8131-59D8EEE21330 at rtty.us>, Bob Camp
> writes:
>
> >You still come back to what killer Loran-C in the first place -
> >Who is going to use it?
>
> No, I don't particularly think Loran-C is a "killer", but until recently
> it was the only feasilble backup for fragile GNSS signals.
>
> >Until somebody shuts down GPS in a big way, not a lot of drive for
> >an alternative.
>
> I agree, but that doesn't make it sensible thinking :-)
>
> I think the LightSquared fiasco made some people realize how many
> eggs they put in one basket, and I'm sure the Loran-C tests needs
> to be seen in that context.
>
> But that doesn't make them a good idea: Resurrecting LORAN-C now
> will never make it an economical backup to GNSS.
>
> Instead of insisting on keeping an on-air format optimised for
> staring at 1950-vintage oscilloscopes, what we need is a VLF system,
> in sub/low kW power-range, based on spread-spectrum technology, with a
> data-channel so receivers don't have to have a hard coded list
> of all transmitters.
>
> That would make roll-out a matter not for governments, but for
> airports, harbours and other interested parties, like for instance
> DME.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
>
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