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
199525727
199639344
199748025
199859330
199965814
200092438
200183971
2002100116
2003114211
2004120046
2005123858
2006133900
2007136780
2008139978
2009146772
2010159429
2011170763
2012242650
2013275330
2014346887
2015330256
2016411151
2017188800
2018257768
2019283312
2020244740
2021193502
2022241991
2023224878
2024170542