高精度海洋耀斑二维指向算法研究
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摘要
在探测海面大气成分时,由于海面的反射率较低,通过观测高亮度的海洋耀斑可提高入瞳辐射能量,从而获得高信噪比的可见光短波红外大气观测数据。海洋耀斑本质上是太阳的像,相对卫星的张角较小,因此需要卫星通过二维跟踪机构实现跟踪观测。研究了一种考虑地球椭率的海洋耀斑二维跟踪计算方法,分析了地球椭率以及太阳对地球的张角对计算误差的影响,给出了一年内的误差变化情况,并将其与卫星工具包(Satellite Tool Kit,STK)输出的结果进行了对比。
In the atmospheric sounding over ocean,because of the relatively low reflectivity of ocean,it is feasible to improve the incident radiation energy by observing the solar glint and hence to get the visible and short wave infrared atmospheric data with high signal-to-noise ratio.Essentially,solar glint is an image of the sun.Its divergence angle relative to the satellite is rather small.Therefore,it is necessaryfor the satellite to use a 2-axis tracking mechanism to implement solar glint observation.A 2-dimension solar glint tracking calculation algorithm considering the ellipticity of the earth is studied.The influence of the ellipticity of the earth and the sun on the calculation error is analyzed.The iterated convergence performance of the algorithm within a year is given and the results are compared with those output by the Satellite Tool Kit(STK).
In the atmospheric sounding over ocean,because of the relatively low reflectivity of ocean,it is feasible to improve the incident radiation energy by observing the solar glint and hence to get the visible and short wave infrared atmospheric data with high signal-to-noise ratio.Essentially,solar glint is an image of the sun.Its divergence angle relative to the satellite is rather small.Therefore,it is necessaryfor the satellite to use a 2-axis tracking mechanism to implement solar glint observation.A 2-dimension solar glint tracking calculation algorithm considering the ellipticity of the earth is studied.The influence of the ellipticity of the earth and the sun on the calculation error is analyzed.The iterated convergence performance of the algorithm within a year is given and the results are compared with those output by the Satellite Tool Kit(STK).
引文
[1]陈斌.太阳耀斑电离层效应的统计分析与模拟研究[D].北京:中国科学院地质与地球物理研究所,2005.
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[5]章仁为.卫星轨道姿态动力学与控制[M].北京:北京航空航天大学出版社,1998.
[6]焦文海.卫星导航系统坐标基准建立问题的研究[R].上海:中国科学院上海天文台,2003.
[2]康健,张杰,孟俊敏.耀斑遥感图像均衡化的多顶式拟合方法[J].中国海洋大学学报,2010,40(6):36--40.
[3]Masakatsu Nakajima,Akihiko Kuze,Hiroshi Suto.The Current Status of GOSAT and the Concept of GOSAT-2[C].SPIE,2012,8533:853306.
[4]Robert Haring,Randy Pollock,Brian Sutin,et al.Current Development Status of the Orbiting Carbon Observatory Instrument Optical Design[C].SPIE,2005,5883:58830C.
[5]章仁为.卫星轨道姿态动力学与控制[M].北京:北京航空航天大学出版社,1998.
[6]焦文海.卫星导航系统坐标基准建立问题的研究[R].上海:中国科学院上海天文台,2003.