星空背景数字图像生成方法研究

随着空间监视相机灵敏度的提高，探测到的恒星星等越来越高，而现有基于星表数据的星空背景生成技术已难以满足要求。为了更好验证空间目标检测与跟踪算法，提出一种相机在回路的星空背景数字图像生成方法。该星空背景数字图像生成方法依据光度量与辐射度量的关系，提出恒星成像信号强度计算模型；通过星图软件SKYMAP，对天区内恒星数目及星等进行统计，得到相机观测视场内恒星数目与星等的统计函数；综合恒星成像信号强度计算模型、恒星数目及星等的统计函数与恒星在焦面的成像特性，提出基于全天区统计的星空背景数字图像生成方法。该方法可生成任何星等范围内的星空背景图像。最后，基于相机CCD与光学系统参数，对星空背景数字图像生成方法进行仿真。

Digital image generating method for star map

Along with improvement of detection sensitivity of space surveillance sensor, magnitude of detected star became higher and higher. Existing generating method for star map based on star catalog could not meet the requirement of magnitude. In order to verify the method of space object detection and surveillance more exactly, the digital image generating method base on CCD and optical system parameter of sensor was produced. According to the relation of photometry and radiometry, the model of star imaging gray value was produced. The number and magnitude of stars in the space was count to produce the statistic regularity of the number and magnitude of stars in the field of view by star map software SKYMAP. By above function and statistic regularity, digital image generating method base on statistic regularity of stars in the space was set up. The method can generate star map of all apparent magnitude range. Based on CCD and optical system parameter, digital image generating method was simulated.