武奕楠 吕增明.多视场空间相机成像轨迹计算与应用[J].国外电子测量技术,2015,34(9):62-66
多视场空间相机成像轨迹计算与应用
Calculation and application of imaging track for multi fields space camera
  
DOI:
中文关键词:  多视场空间相机  地面轨迹  共线方程  成像条带
英文关键词:multi fields space camera  ground track  collinearity equation  imaging bands
基金项目:国家863计划(863-2-5-1-13B)资助项目
作者单位
武奕楠 吕增明 中国科学院长春光学精密机械与物理研究所 
AuthorInstitution
Wu YinanLv Zengming Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences 
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中文摘要:
      多视场空间相机包含多个独立的光学成像系统,为保证在轨连续成像时各视场成像条带满足重叠要求,需要精确的计算相机视场边缘对应的地面轨迹。首先根据空间相机为中心投影成像的特点,以坐标系变换结合共线方程推导像点与地面轨迹点的严格数学关系,接着以某单星双视场相机为例计算在不同纬度和姿态下的成像条带,以条带重叠作为约束,遍历计算安装方位角为-0.28°时,可以保证卫星±40°侧摆范围内成像时,两个视场的条带图像满足重叠要求。该方法同样可应用于其他类型空间相机在任何姿态下的地面轨迹计算。
英文摘要:
      Multi fields space camera contains multiple independent system of optical imaging. In order to ensure overlapping of each imaging bands while space camera imaging continuously on the orbit, the ground track of field edge for camera need to be calculated accurately. Firstly, according to the characteristic that space camera imaging is perspective projection imaging, the strict mathematical relationship between image point and ground track point was deduction by combining space coordinate transformation with collinearity equation of centre projection. Then, illustrating by the case of double fields camera, the imaging bands behind different latitudes and attitudes were calculated. Finally, the fixing azimuth angle was calculated by restriction of bands overlapping. The optimal value is -0.28°. These two imaging bands of fields satisfied the requirement of overlapping, while satellite scrolling imaging between +40°and -40°. The method can be applied to other space camera of different types, and the ground track can be calculated at any attitudes.
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