FY3 - GNOS instrument performance and results analysis in mountain-based validation experiment
Abstract
GNSS Occultation Sounder(GNOS) is a GNSS-based radio occultation explorer instrument both in ionosphere and atmosphere. GNOS is a new payload of the FY-3 series of meteorological satellites developed by Center for Space Science and Applied Research, Chinese Academy of Sciences(CSSAR) and its purpose is to probe atmospheric temperature, pressure, and humidity profiles and also to investigate ionospheric total electron content (TEC). Both GPS and Compass signal can be received by GNOS, enabling more occultations to be observed. When the occultation is under dynamic atmosphere conditions, the conventional dual-frequency tracking of GNSS signals is complemented by open loop tracking with sampling of the signal at a 100Hz rate, providing an opportunity to analyze the spectral content of the received signal showing atmospheric modulation. This paper presents the instrument performance as derived from analysis of measurement data of mountain-based occultation validation experiment at Mt Wuling in Hebei Province. The experiment shows that GNOS can acquire or track lower elevation radio signal with open loop in rising or setting occultation events comparing with JAVAD two-frequency GPS receiver. Then the refractivity profiles of GNOS obtained during the experiment are compared with those of radiosonde. The comparison result shows that the refractivity profiles obtained by GNOS are reasonable and consistent with those of radiosondes. The statistical result shows that RMS of the relative difference between the GNOS and radiosonde is about 3%.
- Publication:
-
39th COSPAR Scientific Assembly
- Pub Date:
- July 2012
- Bibcode:
- 2012cosp...39.2143W