1. Ground-Based Global Navigation Satellite System Observation Summary Data (30-second sampling, daily files) from NASA CDDIS
  2. temporal
YearFile Count
199211800
199319299
199416123
199520508
199631660
199738804
199847989
199953434
200074217
200167066
200279896
200391423
200495982
200598984
2006107295
2007109506
2008112254
2009117708
2010127961
2011137360
2012194460
2013220350
2014278198
2015264501
2016329736
2017151415
2018207211
2019229881
2020198736
2021156295
2022195762
2023183177
2024168691
2025151507
20265268