[FOSS-GPS] Accurate timestamp in rtkpost

David Kelley DavidKelley at iTSware.net
Fri Dec 4 20:45:16 PST 2015

Musa:  What is your end goal here? Convert your data to RINEX with 
RTKLIB's convert tool and look at when your measurement epochs actually 
occurred.  Chances are that they are aligned to the second, and that is 
what is driving you time alignment.  Can you have the Topcon output at a 
rate greater then 1Hz, and then look at that?  As general rule, the 
actual observation time stamp is precise to units steps of 100ns 
(presuming that the nav filter will then resolve this further, to pSec 
in the case of good RTK) , but the vast majority of devices will not 
"wake up" with some random offset point and then provide 1Hz 
measurements from that point, rather they will align to the current 
second and give you the summed average of the range and range rate of 
the past 1000 CA code intervals. Net result; you get 1Hz data aligned to 
the second unless you work real hard.
Regards, David Kelley

On 12/4/2015 7:11 PM, ABM Musa wrote:
> Hi,
> I’m using a Topcon GR3 as a rover to collect some data and then post processing it with rtkpost along with data from a nearby CORS station. I’m using rover navigation and observation files, base-station observation file, and precise orbital file (sp3). However, the timestamp in the solution file is only with accuracy of whole seconds. Can you please let me know how I can get the timestamp accuracy in milliseconds?
> -Musa
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