An introduction to China FY3 radio occultation mission and its measurement simulation

作者：Bi, YanMeng^*; Yang, ZhongDong; Zhang, Peng; Sun, YueQiang; Bai, WeiHua; Du, QiFei; Yang, GuangLin; Chen, Jie; Liao, Mi

来源：Advances in Space Research, 2012, 49(7): 1191-1197.

DOI：10.1016/j.asr.2012.01.014

• Remote sensing
• Radio occultation
• GNOS
• FY3-C

GNSS (Global Navigation Satellite System) radio occultation mission for remote sensing of the Earth's atmosphere will be performed by GNUS (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 GNUS mission and presents some results of measurement simulation. The key designed specifications of GNUS are also shown. The main objective of simulation is to provide scientific support for GNUS 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 GNUS 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 GNUS clock error were the primary error sources for FY3-C occultation mission.

• 出版日期2012-4-1
• 单位国家卫星气象中心; 中国科学院国家空间科学中心