[teqc] Interpolation/upsampling of rinex

Smalley rsmalley at memphis.edu
Tue Aug 18 11:50:18 MDT 2009

Hi Lou:

I agree with your sentiments, but under the correct conditions 
interpolated data is perfectly OK and valid. IF, and that is a BIG IF, 
the frequency content of the analog signal before sampling has no energy 
above Nyquist (half the sampling rate) then one can reconstruct the 
continuous, analog signal at any arbitrary time, not just at the 
samples. The IF is SO BIG, however, that anyone proposing to 
upsample/interpolate is most probably not doing something valid (just 
the fact that they are asking indicates they probably don't understand).

I have a manuscript in press at SRL that talks about aliasing and 
high-rate GPS. I can send you a copy if you agree not to distribute it 
outside the Facility.


>> Teqc is a versatile tool for manipulating rinex files. Does it also do
>> upsampling/interpolation of rinex data? I have not found any description
>> in the manual/tutorial.
> Teqc make data up out of thin air?  That's a big "no".
> --lou
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Louis H. Estey, Ph.D.              office:  [+001] 303-381-7456
> UNAVCO, 6350 Nautilus Drive           FAX:  [+001] 303-381-7451
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> "If the universe is the answer, what is the question?"
>                                                 -- Leon Lederman
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Dr. Robert Smalley, Jr.
Research Professor
Center for Earthquake Research and Information
The University of Memphis
3876 Central Ave., Suite 1
Memphis, TN 38152-3050
901-678-4734 fax
rsmalley at memphis.edu
(NOTE: smalley at ceri.memphis.edu is going away)
office: 3892 Central, Room 103

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