FY-3 Ultraviolet Total Ozone Unit In-Orbit Performance and Application in China

FY-3 satellites are Chinese second-generation polar orbit meteorological satellite series. Ultraviolet Total Ozone Unit (TOU) is one of the main payloads on FY-3 satellite and the first instrument for daily global coverage of total ozone monitoring in China. FY-3A was launched on 27 May 2008. Since 3 June 2008, TOU has already operated more than 5 years, and it has kept in a good working status. TOU is a fixed grating and slit-array Ebert-Fastie grating spectrograph system. It has the multi-wavelengths detecting and two-dimensional scanning which enables global daily ground coverage. This paper analysis the recent working status of the instrument, including the sensitivity, measuring precision of solar irradiance, diffuser degradation and wavelength drift, then shows the products in the application of global climate changing research and environmental monitoring.