平台姿态误差对TDICCD相机成像几何质量的影响

Impact of satellite platform attitudes' error on imaging geometric quality of TDICCD

研究卫星平台姿态误差对TDICCD相机成像几何质量的影响有助于提出姿态指标设计要求以提高相机几何成像质量,以像点位移为中间参量,研究平台姿态误差和成像几何质量指标之间的定量关系。基于平台姿态误差引起的像移速度、偏流角和积分时间等成像参数误差分析,结合严密几何成像模型推导像点位移的误差模型,建立从像点位移量到相邻像元间角度畸变、长度畸变、像元分辨率和定位误差等几何质量指标的定量模型,构建从平台姿态误差到相机成像几何质量指标的完整定量分析链路。仿真实验结果表明,偏航角姿态误差是影响成像几何质量的主要因素。

The research of influence on TDICCD camera, s imaging geometric quality can contribute to improving quality by advancing the design requirements of the platform. The quantitative relation of the platform attitude error and the imaging geometric quality based on the image point displacement was studied. The model of imaging parametersf error caused by attitude error was built, including the error of image motion velocity, the drift angle correction and integral time. The relation between imaging parametersf error and image motion combined with the strict geometric imaging model was deduced. The quantitative model of the geometric quality indexes under the influence of image motion was established, including angle distortion, length distortion, pixel resolution and positioning accuracy. The perfectly quantitative chain from attitude error to geometric quality indexes was created. The simulation experiment was conducted and the results indicate that the main influencing factor of geometric quality is the error of yaw angle.