[time-nuts] Followup (still want a GPS-type NTP refclock)

[Bob Camp]

Hi

This comes back to the "what are you trying to do?" question. If the target
is "better than 1 ms", then the location does not have to be all that
accurate. You can get within a hundred meters using a good map, and some
care about coordinate systems. That's adequate for a < 1 ms design.

Without an adequate description of the objective, it's very hard to rule in
/ rule out any design details. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Thursday, October 18, 2012 11:25 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Followup (still want a GPS-type NTP refclock)

OK, unless you have the coordinates of your antenna position... and here
comes the difficult move: how can I have the coordinates of an indoor
antenna that can't receive the required satellites? Starting from a
suitable outdoor position then using precise length and angle measurements,
yes, it can be done.

On Thu, Oct 18, 2012 at 3:35 PM, Mike S <mikes at flatsurface.com> wrote:

> On 10/18/2012 6:17 AM, Azelio Boriani wrote:
>
>> Take care that the 1 satellite timing mode comes after having seens more
>> than 4 satellites for at least 10000 seconds (usually, or greater). You
>> can't start a timing mode receiver with 1 satellite.
>>
>
> Yes, you can. You only need to tell it its own coordinates, or have them
> previously stored in the unit.
>
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