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I want to post-process GPS files via Differential processing (DGPS/DGNSS mode)

using rtklib (http://www.rtklib.com/).

I have rover and base observations in .rinex format.

I took FINAL satellite orbit solutions from NOAA-CDDIS archive (https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/orbit_products.html) in the following format:

WWWW/igsWWWWD.sp3.Z

Using the utility rtkpost from rtklib I get the error "no nav data".

Is that a problem of the sp3 format? (sp3 is listed within the acceptable formats)

Did I download completely wrong files for the satellite orbit solutions?

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The "no nav data" comes from rtkpost not having an idea where your base station is. Check out the Options/Positions/Base Station settings and make sure it is set to use include the RINEX nav file, the Obs file Header, or an explicit position as desired.

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This is a known issue:

RINEX NAV is always needed even with precise ephemeris and clocks. It's used to recognize unhealthy satellites.

https://github.com/tomojitakasu/RTKLIB/issues/87

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