<p>An objective of the GRACE-FO mission is the continuation of GRACE radio occultation measurements successfully performed between 2006 and 2017.</p>
<p>GRACE and GRACE-FO radio occultations contribute to the overall radio occultation dataset used in weather and climate applications.</p>
<p>Since mid-2019 rising occultations from GF1 are available while setting radio occultations from GF2 are still disabled. After several on-board software updates and raw data reader improvements about 280 daily GF1 radio occultations are available since March 2020.</p>
<p>Currently GF1 radio occultation data are processed on the basis of different measured variables: For different GPS satellites a combination of L1CA/L2P, L1CA/L2C, or L1CA/L5 is available.</p>
<p>In this study first results of GF1 processing are presented. Refractivity and temperature data up to an altitude of 60 km will be compared with ECMWF operational analyses and the quality of the different measured variables will be evaluated.</p>
Research on the Sub-Network Division and Common-Station Selection Methods of Large-Scale GNSS Reference Station Network Data Processing
