MERSI in FY-3 Meteorological Satellite
- Paper number
IAC-08.B1.3.6
- Author
Prof. xinhua niu, China
- Coauthor
Prof. Lei Ding, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, China
- Year
2008
- Abstract
The characteristic of the Medium-Resolution Spectrum Imager(MERSI) in the FY-3 meteorological satellite is presented in this paper. Meteorological satellite is one kind of applied satellite that has tremendous benefit to both economic and society. FY-3 meteorological satellite is the new generation polar orbit meteorological satellite after FY-1 in China. MERSI is one of the important payloads onboard the FY-3 satellite which has great advantage at aspects of the band setting and the radiometric sensitivity, and it will provide vital parameters for weather forecasts, climate change research and monitoring of the Earth’s environment. The MERSI instrument provides high radiometric sensitivity in 20 spectral bands ranging in wavelength from 0.4µm to 12.5µm. Five bands including two SWIR bands and one LWIR band are imaged at a nominal resolution of 250m at nadir, and the remaining 15 bands at 1000m. A ±55.4-degree scanning pattern at the FY-3 orbit of 836km achieves a 2,937-km swath and provides global coverage twice every day. The Scan Mirror Assembly uses a 45-degree rotating scan mirror, and a three-mirror system(K-mirror) to offset image rotation from 45-degree rotating scan mirror is used. The optical system consists of an aspherical telescope and four refractive objective assemblies which work in the VIS, VIS/NIR, SWIR and LWIR spectral regions to cover a total spectral range of 0.4 to 12.5µm. The 20-cm telescope is a coaxial two-mirror system. and there is an intermediate image behind the telescope. The way of multi-sensors scanning on spacecraft is adopted. A high-performance passive radiative cooler provides cooling to 100K for the one LWIR spectral band on one HgCdTe Focal Plane Assembly (FPA), and it also provides cooling to 150K for the two SWIR spectral bands on another HgCdTe FPA at the same time. Novel photodiode-silicon readout technology for the visible and near infrared provide unsurpassed quantum efficiency and low-noise readout with exceptional dynamic range. Analog programmable gain and offset and FPA clock and bias electronics are located near the FPAs in two dedicated electronics modules, the Space-viewing Analog Module (SAM) and the Forward-viewing Analog Module (FAM). A third module, the Main Electronics Module (MEM) provides power, control systems, command and telemetry, and calibration electronics. The system also includes a on-board calibrator. The first MERSI Flight Instrument which is integrated on the FY-3 spacecraft has been developed by Shanghai Institute of Technical Physics now, it will be launched soon in 2008. The MERSI instrument will offer an unprecedented look at terrestrial, atmospheric, and ocean phenomenology for a wide and diverse community of users throughout the world.
- Abstract document
- Manuscript document
IAC-08.B1.3.6.pdf (🔒 authorized access only).
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