环境减灾-1A、1B卫星光学载荷在轨运行情况分析

环境减灾-1A、1B卫星于2008年9月6日发射升空,至2013年7月20日,2颗卫星的4台宽覆盖多光谱CCD相机、1台超光谱成像仪(HSI)和1台红外相机(IRS)已在轨稳定工作近5年,共获取超过61万景2级地面遥感图像数据。文章对在轨运行的光学载荷遥测参数进行了统计和分析,结果表明:DC/DC电压遥测变化量不超过5%,关键光机部位温度遥测变化量小于2.25℃,转动部件电压和电流遥测变化量小于1%,遥测参数均在设计范围内,显示光学载荷在轨稳定正常工作。最后,综合分析了光学载荷图像数据应用情况,分析表明:光学载荷图像数据具有较强的地物影像分类、提取和分辨能力,与国外同类卫星比较,水体识别符合度达到90%以上,旱情分级符合度大于66%,光谱分辨率达到5nm,积雪范围提取精度达到90%以上,在各类应用领域发挥了较大的效能。

In-orbit Operation Situation Analysis of HJ-1A, 1B＇s Optical Payloads

HJ-1A,1B satellites were launched on 6 Sep. 2008. By the time of 20 Jul. 2013, the optical payloads of HJ-1A,1B including wide coverage CCD cameras, HSI（hyper-spectrum ima- ger） and IRS（infrared scanner） had worked for nearly 5 years. During this time, the ground sta- tions received over 610 000 scences second-level optical payload data. This paper describes and analyzes the in-orbit operation of the optical payloads. The results show that DC/DC voltage varies less than 5%, key modules temperature varies less than 2.25℃, and rotating module volt- age and current vary less than 1%. All the telemetering parameters are within the design range, and the optical payloads are in good conditions. Finally, the quality and application condition of these optical payloads are summarized. The image data have a strong capability of classification and exculpation of earth object. Compared with similar satellites ,water identification coincidence is better than 90%, drought classification coincidence is better than 66%, spectral resolution is less than 5nm, and snow area classification precision is higher than 90%.