An introduction to China FY3 radio occultation mission and its measurement simulation
2012; Elsevier BV; Volume: 49; Issue: 7 Linguagem: Inglês
10.1016/j.asr.2012.01.014
ISSN1879-1948
AutoresYanmeng Bi, Zhongdong Yang, Peng Zhang, Yueqiang Sun, Weihua Bai, Qifei Du, Guanglin Yang, Jie Chen, Mi Liao,
Tópico(s)Atmospheric Ozone and Climate
ResumoGNSS (Global Navigation Satellite System) radio occultation mission for remote sensing of the Earth’s atmosphere will be performed by GNOS (GNSS Occultation Sounder) instrument on China FengYun-3 (FY3) 02 series satellites, the first of which FY3-C will be launched in the year 2013. This paper describes the FY3 GNOS mission and presents some results of measurement simulation. The key designed specifications of GNOS are also shown. The main objective of simulation is to provide scientific support for GNOS occultation mission on the FY3-C satellites. We used EGOPS software to simulate occultation measurements according to GNOS designed parameters. We analyzed the accuracy of retrieval profiles based on two typical occultation events occurring in China South–East area among total simulated events. Comparisons between the retrieval atmospheric profiles and background profiles show that GNOS occultation has high accuracy in the troposphere and lower stratosphere. The sensitivities of refractivity to three types of instrumental error, i.e. Doppler biases, clock stability and local multipath, were analyzed. The results indicated that the Doppler biases introduced by along-ray velocity error and GNOS clock error were the primary error sources for FY3-C occultation mission.
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