摘要
开展空间目标的光散射与辐射特性的研究,对目标的探测、跟踪与识别、突防等技术具有十分重要的应用价值。本文对空间目标光度特性以及成像信噪比展开了研究。首先,对太阳在大气层外辐射照度进行了计算,推导出空间目标的辐照度计算公式,计算了目标的等效视星等值。然后,研究了J2000.0惯性坐标系中太阳、观测卫星和目标卫星的矢量坐标和各个角度与距离关系,并分析了相对距离、太阳相位角的变化及其对空间目标视星等值的影响。最后,针对CCD相机的系统参数,计算了空间目标CCD成像的信噪比。仿真表明,空间目标的等效星等在不同的观测时刻存在2个星等左右的差别,导致目标成像的信噪比在观测过程中也存在变化。系统地对空间目标的光度特性和进行了研究,为空间目标的探测和识别提供了依据。
Research of the scattering and radiation characteristics of the space target is of great value to target detection, track and identification. The luminosity feature and signal-noise ratio of space target are analyzed. First, based on the basic radiation theory, calculation formulation for irradiance of space diffuse reflection target is presented, and the equivalent magnitude of the space target is derived. Then the relative position vector relations of the sun and the space target and the CCD camera in equatorial coordinate system are studied. Analysis of the influence factors to target magnitude is also provided. Finally, on the basis of the CCD camera system parameter, the SNR of space target is computed. The simulated results show that the space target varies with two magnitudes at different observation time. A system study of the magnitude characteristics and imaging SNR of the space target is researched in order to give basis for space target detection and identification.
出处
《红外技术》
CSCD
北大核心
2007年第12期716-719,共4页
Infrared Technology
