Validation results of NmF2 derived from Global Navigation Satellite System radio occultation observed by GNOS on FY-3C Satellite
Abstract
The first Global Navigation Satellite System (GNSS) Occultation Sounder (GNOS) which is compatible with both BeiDou Navigation Satellite System (BDS) and Global Positioning System (GPS) was successfully launched into orbit onboard the FengYun3C satellite (FY3C) on September 23, 2013, and it has already gathered a large amount of ionospheric radio occultation data so far, including the GPS radio occultation (GPSRO) data and BDS radio occultation (BDSRO) data. In this work, we discuss the configuration of the FY3C/GNOS firstly, then we define matching principles of NmF2 data between GNOS-GPSRO/GNOS-BDSRO and ionosondes to match them into data pairs, thus the quality analysis of the GPSRO and BDSRO products can be carried out. We get that between NmF2 data of GNOS-GPSRO and ionosondes during October 1, 2013 and September 30, 2014, their correlation coefficient, bias and standard deviation (std) are 0.96, 6.71% and 18.03%, respectively, and between NmF2 data of GNOS-BDSRO and ionosondes during October 1, 2013 and October 10, 2015, their correlation coefficient, bias and std are 0.96, 10.21%, 19.61%, respectively. Not hard to see the NmF2 data of GPSRO and BDSRO observed by the same GNOS payload have very similar precision, they are also consistent to precision of other international radio occultation products, like those of CHAMP and COSMIC. That way the precision consistency between GNOS-GPSRO and GNOS-BDSRO, GPSRO/BDSRO and ionosondes, GPSRO/BDSRO and other international radio occultation products are verified. The NmF2 quality analysis between GNOS-GPSRO/GNOS-BDSRO and ionosondes in different latitudes, local times, seasons, orbits are also included. The precision consistency of the ionospheric radio occultation products of different GNSS is significant to the ionospheric research and space weather forecasting based on the GNSS occultation sounding data. By comprehensively analyzing and utilizing its ionospheric occultation data with those of other GNSS, it is possible to improve the coverage and temporal-spatial resolution of occultation events, which is conducive to the real-time monitoring of ionospheric weather and the research and development of ionospheric climate models. And the enhancement of BDS and the continuous launches of FY3 series satellites in the future will greatly increase the number of ionospheric occultation events, which will enable GNOS to provide more occultation data for the world.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E3638W