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Posted by Richard Owlett on April 11, 2008, 2:06 pm


I have observations in Rinex format at 30 second intervals.
I have precise orbits in sp3 files at 15 minute intervals.

I wish to do my own position calculations.
Am I correct thinking that it is reasonable to use Scilab's smooth()
function (interpolation by splines) to get satellite "positions" at 30
second intervals?

Posted by J. J. Lodder on April 11, 2008, 5:48 pm



> I have observations in Rinex format at 30 second intervals.
> I have precise orbits in sp3 files at 15 minute intervals.
>
> I wish to do my own position calculations.
> Am I correct thinking that it is reasonable to use Scilab's smooth()
> function (interpolation by splines) to get satellite "positions" at 30
> second intervals?

Why bother to interpolate when you have the orbit parameters?

Just calculate,

Jan

Posted by Richard Owlett on April 11, 2008, 6:36 pm


J. J. Lodder wrote:
>
>
>>I have observations in Rinex format at 30 second intervals.
>>I have precise orbits in sp3 files at 15 minute intervals.
>>I wish to do my own position calculations.
>>Am I correct thinking that it is reasonable to use Scilab's smooth()
>>function (interpolation by splines) to get satellite "positions" at 30
>>second intervals?
>
>
> Why bother to interpolate when you have the orbit parameters?

'Cause I need it in ECEF ;)

This is a self education project.
Or am I missing something?

>
> Just calculate,
>
> Jan

Posted by T Driver on April 12, 2008, 2:44 pm


> J. J. Lodder wrote:
> >>I have observations in Rinex format at 30 second intervals.
> >>I have precise orbits in sp3 files at 15 minute intervals.
> >>I wish to do my own position calculations.
> >>Am I correct thinking that it is reasonable to use Scilab's smooth()
> >>function (interpolation by splines) to get satellite "positions" at 30
> >>second intervals?
> > Why bother to interpolate when you have the orbit parameters?
> 'Cause I need it in ECEF ;)
> This is a self education project.
> Or am I missing something?
> > Just calculate,
> > Jan

The orbit parameters in the data from the satellites do give you the
propagated orbit in ECEF :)

Posted by Richard Owlett on April 12, 2008, 3:11 pm


T Driver wrote:
>
>>J. J. Lodder wrote:
>>>>I have observations in Rinex format at 30 second intervals.
>>>>I have precise orbits in sp3 files at 15 minute intervals.
>>>>I wish to do my own position calculations.
>>>>Am I correct thinking that it is reasonable to use Scilab's smooth()
>>>>function (interpolation by splines) to get satellite "positions" at 30
>>>>second intervals?
>>>Why bother to interpolate when you have the orbit parameters?
>>'Cause I need it in ECEF ;)
>>This is a self education project.
>>Or am I missing something?
>>>Just calculate,
>>>Jan
>
>
> The orbit parameters in the data from the satellites do give you the
> propagated orbit in ECEF :)

I was not aware of that.
However I was hoping to use the "precise orbits". Are orbit parameters
also available for those in ECEF?


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