[teqc] Query

Robert Khachikyan robertk at jpl.nasa.gov
Thu Oct 4 11:19:07 MDT 2018


Dear Javier,

The JPL clocks and orbits are now mostly available for ITRF18. However, 
this is data driven.

What date range of your data you are PPP-ing?

Regards,
--Robert


On 10/04/2018 09:37 AM, Javier Jovani Mendez Ramirez wrote:
>
> Good morning from
>
>
> Engineers is that I have the following doubt and I ask the favor if 
> you can explain me,
>
>
> It turns out that by construction I like to send Rinex files of 
> positioning that we do to two centers that provide a service called 
> PPP - Precise Point Positioning. These centers are the natural 
> resources office of Canada and the JPL laboratory of NASA.
>
>
> I do this to compare the coordinates thrown by these centers with the 
> coordinates that give me the adjustments using as a base, the stations 
> of continuous operation of the IGAC
>
>
> I did this because, from my analysis, the coordinates were 
> "compatible", that is, they were all referred to the same reference 
> system, ITRF08 measurement time
>
>
> From a time here, when I send a rinex file to NASA, he reports me the 
> coordinates in ITRF 08 measurement time, when I send them to the 
> Canadian office he sends them to me in ITRF14 measurement time and 
> when I download the certifications of IGAC's continuous operation 
> stations are given in ITRF14.
>
>
> The doubt that assails me is. What is the reference system that uses 
> the GPS system by default? How do I change the reference system of the 
> GPS system? Are the ITRF updates taken automatically by the GPS system?
>
>
> I will be very grateful for the collaboration you can give me
>
>
> Sincerely
>
>
> Javier Méndez
>
> Bogota Colombia
>
>
>
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