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建立精确的光线几何模型,推导地物与影像间的正反算公式是航天TDI CCD(时间延迟积分电荷耦合器件)相机动态成像仿真的关键步骤。立体测绘卫星全链路仿真以光线追迹为主线,以高精度高分辨力地表物理模型为输入源,综合考虑了大气辐射传输、光学系统成像、探测器光谱响应和相机噪声等各个环节,完成了成像过程端到端的完整分析。以可见光光学遥感相机为例,在考虑轨道进动、地球在惯性系下的岁差章动和TDI CCD拼接的情况下,完成双线阵相机动态成像光线追迹几何建模,并对模型误差源进行分析。经实验验证与分析,正视相机几何物理模型定位精度达124 m,前视相机定位精度达193 m,满足立体测绘全链路仿真的几何建模要求。
The establishment of precise geometric model of light and the derivation of positive and negative formulas between ground objects and images are the key steps in the dynamic imaging simulation of space TDI CCD (Time Delay Integrated Charge Coupled Device). Stereo satellite mapping of the full link simulation with ray tracing as the main line to high-precision high-resolution surface physical model as the input source, taking into account all aspects of atmospheric radiation transmission, optical imaging system, the detector spectral response and camera noise, complete A complete analysis of the end-to-end imaging process. Taking the optical remote sensing camera as an example, the geometrical modeling of ray tracing for dynamic imaging of dual-line camera is completed considering the precession of the orbit, Earth’s precession nutation and TDI CCD splicing under the inertial system. The model error source Analyze. The experimental verification and analysis show that the positioning accuracy of the camera geometry-physics model is up to 124 m and the forward-looking camera positioning accuracy is up to 193 m, which meets the geometric modeling requirements of the full link simulation of stereo mapping.