The raw GPS data is useful for various post-processing tasks. What is good source of obtaining raw GPS data in RINEX format?
There are a lot of sources. See our article (Yasyukevich, et al. SIMuRG: System for Ionosphere Monitoring and Research from GNSS. GPS Solut, 2020; Article SIMuRG: System for Ionosphere Monitoring and Research from GNSS
).The main are ftp://garner.ucsd.edu/pub/rinex/, ftp://data-out.unavco.org/pub/rinex/obs/, ftp://ftp.sonel.org/gps/data/
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Yury answer is very complete, if you want RINEX db of Europe and surroundings take a look at the EUREF EPN repository: http://www.epncb.oma.be/_networkdata/data_access/dailyandhourly/datacentres.php
I hope soon a more detailed db will be available from EPOS: https://www.epos-ip.org/data-services/community-services-tcs/gnss-data-and-products
Ashwani, if you want you can access also smaller networks. For instance FReDNet (http://frednet.crs.inogs.it/EnglishSite/XFReDNetHomeENG.htm) is a small network deployed in north-east of Italy at the tip of the Adria plate. You have access to the data at: ftp://www.crs.inogs.it/pub/gps/ where you can find RINEX at 1s and 30s but also the raw data where RINEX come from. FReDNet records data since 2002 and it's still up and running.
IGS Network daily observations (https://www.igs.org/network):
https://www.igs.org/data-access/#global-dcs510f-e4aa
https://cddis.nasa.gov/archive/gnss/data/daily (free registration required)
ftp://igs.ensg.ign.fr/pub/igs/data/ (major browser do NOT support ftp anymore!)
https://gssc.esa.int/portal/?vuePage=1&size=20&mode=query&sortOption=recent&network_%2F_organisation=IGS (ESA)
EUREF Permanent GNSS Network:
http://epncb.oma.be/_networkdata/data_access/dailyandhourly/datacentres.php
SONEL Network:
https://www.sonel.org/-GPS-.html
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