[time-nuts] Common-View GPS Network
Lachlan Gunn
lachlan at twopif.net
Mon Apr 15 18:12:28 EDT 2013
Hello.
I'm starting with a Resolution T, which claims to offer a single-satellite
mode. I gather that it's not an amazing receiver, but I'm hoping it will be
good enough for a first foray at least. I'm rather hoping that it will do
well, though, since it would mean a cheapish way of making a self-contained
device with 10MHz/ANT on one end and Ethernet on the other.
Thanks,
Lachlan
-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Bob Camp
Sent: Tuesday, 16 April 2013 7:10 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Common-View GPS Network
Hi
One common requirement is a receiver that will give you "per satellite"
information that you can turn into time. About the only way around that is
to pre-determine a set of sats and flag the rest as "do not use". With the
second approach, various geometric issues can get a bit exciting. Either
way good antenna locations and local clocks are needed.
Do you have a specific receiver in mind?
Bob
On Apr 15, 2013, at 8:55 AM, Lachlan Gunn <lachlan at twopif.net> wrote:
> Hello all.
>
>
>
> Having spent some time working over the last year on GPS time
> stability measurement, I'm keen to move onwards and upwards and have a
> go at common-view time transfer. While my receivers are in the post,
> I have thinking about my next direction. One thought that I have had
> is to try to write some software that can be used for real-time
> common-view (public if there is interest, but I am getting ahead of myself
I think).
>
> My question to those in the know is whether they have found
> common-view to be useful over medium timescales (say, an hour or
> four). My understanding is that after a day or so the GPS signal
> itself becomes usable as a standard, so building a network is probably
> not tremendously useful over these sorts of time periods, but looking
> at such as figure 6 of [1], common-view should still be useful between
> a few minutes and hours. Has anyone here tried using such a method to
> produce their own short-term time scale, or is one better off just
> taking the simple route and tracking GPS time directly?
>
>
>
> Thanks,
>
> Lachlan
>
>
>
>
>
> [1] http://www.pttimeeting.org/archivemeetings/2008papers/paper45.pdf
>
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