[time-nuts] GPS timing receivers
phk at phk.freebsd.dk
Tue Oct 25 13:56:06 EDT 2005
In message <20051025.114507.13025778.imp at bsdimp.com>, "M. Warner Losh" writes:
>In message: <435E6BA2.8000906 at erols.com>
> Chuck Harris <cfharris at erols.com> writes:
>: Because PPS isn't encoded in the loran signal. The only way you
>: have of recovering PPS information is to know when the next time of
>: coincidence (TOC) will occur at your location, and start your 1PPS
>: at that time. A TOC is when your master chain's starting pulse
>: happens to occur at an exactly the start of a UTC second.
>So timing LORAN-C receivers only look at one LORAN-C chain then?
Very few LORAN-C receivers are multi-chain.
I belive the Austron 5000M was multi-chain (and took a PDP/11 ?)
Megapulse have some multi-chain receivers as well.
I don't think I've seen any other.
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
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