海洋B星水色仪辐射基准异常分析及修复算法研究
投稿时间:2021-03-31  修订日期:2021-05-08  点此下载全文
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作者单位邮编
范文龙 中国科学院上海技术物理研究所 200083
黄小仙 中国科学院上海技术物理研究所 200083
傅雨田 中国科学院上海技术物理研究所 
基金项目:国家重点研发计划2018YFB0504900、2018YFB0504904
中文摘要:水色遥感产品的三要素为:叶绿素、悬浮物质和黄色物质。水色水温扫描仪(简称水色仪)作为海洋一号卫星的主载荷之一,设置了8个可见近红外探测通道,主要目的是获取全球的海色三要素分布产品,为全球海洋初级生产力分布研究提供初级数据。2007年发射的HY-1B星水色仪,作为零辐射基准的冷空位置在入轨初期即存在光污染,导致近红外探测通道深海水域信号出现截止,并且纬度越低冷空信号越大。为了研究此问题的存在机理并对B星水色仪的历史数据进行修复,在实验室对问题产生源的特性进行了验证,并对其影响机理进行了分析。通过比较C星与B星水色仪的耀光信号大小与太阳天顶角的联系,得到了B星水色仪数据的修正量与太阳天顶角的函数关系,并用于对B星水色仪近9年的遥感数据的修复。为后续与同类海洋遥感仪器的数据比对并反演水色产品奠定了理论基础。
中文关键词:海洋一号卫星  水色水温扫描仪  太阳同步轨道  可见近红外  冷空间  太阳耀光
 
Analysis of Radiation Reference Anomaly of HY-1B COCTS and Research on the Repair Algorithm
Abstract:The three elements of water color remote sensing products are chlorophyll, suspended substance and yellow substance. As one of the main loads of HY-1 satellite, Chinese Ocean Color and Temperature Scanner (COCTS) has set up 8 visible and near-infrared detection channels, to provide primary data for the study of global ocean primary productivity distribution. HY-1B COCTS was launched in 2007, and at the beginning of orbit entry there exists light pollution in cold space which works as the zero-radiation datum, which leads to the signal cut-off in the deep-sea area of the near-infrared detection channel, and the lower the latitude, the bigger the cold air signal is. In order to study the mechanism of the problem and repair the historical data of HY-1B COCTS, the characteristics of the source of the problem was verified in laboratory, and the influence mechanism was analyzed. By comparing the magnitude of the sun glint signal of HY-1C and HY-1B COCTS with the solar zenith angle, the function relation between the correction quantity of HY-1B COCTS and the solar zenith angle is obtained, and it is used to repair the remote sensing data of nearly 9 years of HY-1B COCTS. It lays a theoretical foundation for data comparison with the same kind of ocean remote sensing instrument and retrieving water color products.
keywords:HY-1 satellite, Chinese Ocean Color and Temperature Scanner (COCTS), Sun-synchronous orbit, Visible near infrared (VNIR), Cold space, Sun glitter
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