Easy Fortran Math Downside

I’m requested to observe the trail of a column utilizing GPS in close to actual time and evaluate the outcomes to another outcomes. 

The GPS provides you an ASCII file with Easting, Northing, time and many others in a typical type.  Fortran can learn it simply and do the trivial math. 

That is the uncooked knowledge from a easy GPS and it has not but been put up processed, with RTKLIB written in C. I used to be simply trying on the uncooked. 

A pattern output from 8 hours of eastings yields

It’s trivial to place it into XY however there isn’t any want right here, the bottom theoretically coated is a line about 5 metres lengthy,  as famous right here

If I accumulate the info over 2 days I get a multitude like this 

which is a 2.5 metre circle of information.  

However now I’ve 80000 factors, about 1 per second and the info is following a set of patterns associated to the satellites and the screening with a interval of about 4 hours,  the query is how secure is the middle and the way lengthy to do it’s important to file to get a secure middle estimate.  

But when I break the 80000 factors into 10000 level units and do math, I’ve coated the cycle interval properly every time and the outcomes recommend about 1 mm of whole motion, about what I’d count on.  The graph is in mm.  

Am I merely seeing a manifestation of the central restrict theorem?

Why are the GPS applications not written in Fortran, it’s a ache.  

I’ll look with RTKLIB now to see how shut that will get.