星载多光谱CCD相机研究

研制的星载多光谱 CCD相机采用线阵 CCD推扫方式成像 ,具有蓝、绿、红、近红外、全色五个成像谱段 ,在轨工作时地面像元分辨率为 2 0米 ,覆盖宽度 113公里。相机光学系统采用单镜头焦面分色结构实现多光谱成像 ,每个谱段的探测器阵列由 3片 2 0 4 8元 CCD光学拼接而成 ,以实现地面宽覆盖成像。多片 CCD信号采用串行读出方式 ,使焦面 15片 CCD形成两路视频信号输出给数据传输系统。测试结果显示 ,相机各谱段 MTF典型值为 0 .2 5 ,满足使用要求。

A Multispectral CCD Camera for Satellite Use

The multispectral CCD camera developed is the first one in china for satellite use. The camera uses the linear array push-broom technique for image generation. The images can be obtained in 5 spectra including blue, green, red, infrared, and panchromatic with 20m ground resolution and 113km ground swath when it works in the orbit. The optical system of the camera is a single object lens with a spectroscope in the focal plane for multispectrum image. Three 2048-pixel CCDs are optically butted as each sensor array of the spectral bands for a large ground field. The 15 CCDs in the focal plane are serially read out and form two flows of videosignal to the data transmission system. According to the measurement, the typical MTF value of the camera bands is 0 25 which meets the practical demands.