[time-nuts] Some results of PRS10 and Trimble Resolution
cfmd at bredband.net
Fri Jun 30 02:48:49 EDT 2006
From: "Tom Van Baak" <tvb at leapsecond.com>
Subject: Re: [time-nuts] Some results of PRS10 and Trimble Resolution
Date: Thu, 29 Jun 2006 22:44:53 -0700
Message-ID: <001b01c69c08$50e08280$be0ff204 at computer>
> > Why are dual freq. receivers not used in timing instruments? Ionospheric
> They are. But only in the high-end instruments.
The metrology labs use survey GPS receivers for this obvious reason.
> > errors are almost removed. Surveyors in every small town on earth are
> > routinely getting sub 5cm accuracy in real time. Are not time labs using
> > it to transfer their cesium time to each other?
> True, but what's your guess on the price ratio between
> a 5 cm dual frequency survey-grade timing receiver and
> a M12 or Res-T? I'd guess 100x to 1000x. Anyone
> know for sure?
Hmm, come to think of it, I have never really cared to figure it out. The
surveying folks have fancy antennas too. They go around the world (south pole
included) and measure all kinds of stuff, as the drift-rate of the polar ice
in the Antarctic.
The necessary components isn't directly high-volume compared to the normal
L1 C/A receivers.
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