地球同步轨道二维扫描红外成像技术

相对第一代地球同步轨道遥感卫星基于自旋稳定卫星平台的二维成像技术，基于三轴稳定平台成像技术的最大优势在于大幅度提高成像效率、缩短成像周期和多载荷并举。我国基于三轴稳定平台的第二代地球同步轨道气象卫星扫描成像辐射计，采用双扫描镜结合三反射光学系统、辐射制冷器及线列阵探测器，实现了从可见光至甚长波红外波段的成像。面对扫描成像辐射计的恶劣温度环境、极端指向精度、超长运动手寿命等任务要求组合，研制过程中采用了空间光学、精密机械、长寿命运动、电机控制、空间热控、信息处理等综合技术，使仪器实现了恶劣温度环境下的高精度成像。卫星计划于2016年发射，届时将进一步提高我国预报短时天气及突发性灾害的能力。

Two-dimensional scanning infrared imaging technology on geosynchronous orbit

Compared with the two-dimensional imaging technique based on spin-stabilized satellite platform of the first generation geosynchronousremote sensing satellite, the biggest advantage of the imaging technique based on three-axis stabilized platform lies in its significant improvement of imaging efficiency, shorter imaging period and simultaneous multi-payloads. In China, the second generation geostationary three-axis-stabilized platform weather satellite, FY-4, is in development. FY-4 scanning imagery radiometer adopts the imaging scheme of double-scan-mirror mechanism combined with three-mirror-anastigmat(TMA), linear array detectors and radiant cooler, achieving an imaging band from visible to very long wavelength IR. The radiometer development is faced with a combination of various task requirements, including the radiometer's harsh on-orbit temperature environment, pointing accuracy, long movement life, etc. So during the developing process, comprehensive technologies of optics, precision mechanics, long lifetime movement, motor control, space thermal control, information processing, etc. were employed to realize high precision imaging under poor temperature environment. The FY-4 satellite will be launched in 2016, which will then further enhance Chinese capacity of unexpected disaster and short-time weather forecasting.