1. Ground-Based Global Navigation Satellite System Observation Summary Data (30-second sampling, daily files) from NASA CDDIS
  2. temporal
YearFile Count
199214838
199324076
199420289
199525734
199639707
199748379
199859879
199966591
200092745
200183971
2002100116
2003114211
2004120046
2005123858
2006133900
2007136780
2008139978
2009146772
2010159429
2011170763
2012242650
2013275330
2014346887
2015330256
2016411151
2017188810
2018257789
2019283393
2020245409
2021193666
2022242062
2023225348
2024205043
202542861