推扫式航空遥感器像移补偿精度的分析

Analysis of image motion compensation accuracy for aerial push-broom sensor

为分析飞行器的速度、航高、姿态角与姿态变化对推扫式航空遥感器成像质量的影响，采用光线矢量与光轴旋转变换相结合的方法建立了系统的像移模型，计算遥感器像移补偿的精度。分析了平移与旋转运动所引起像移的特点，通过运动的分解建立了推扫式航空遥感器的像移模型；以两组工作参数为条件，分析速高比、姿态角与姿态变化对像移的影响，并提出相应的像移补偿方法。应用蒙特卡罗法，依据与模型相关变量的误差分配，计算推扫式航空遥感器像移补偿的精度。在满足表3的误差要求，速高比为0．3～0．5（1／s），TDI基数不超过32级的情况下，像移补偿残差的3σ值为16μm，达到了遥感器的指标要求。

In order to analyze the effects of the speed,attitude and posture change of aircraft on the image quality of push-broom imaging sensor, an image motion model is established to calculate the accuracy of image motion compensation by combining light vector with optical axis revolution. The characteristics of image motion caused by translation and rotation are analyzed, and the image motion model of push-broom imaging sensors is established by decomposing the movement. With two groups of parameters, the influence of aircraft motion on image motion is analyzed and the method of image motion compensation is given. The accuracy of image motion compensation is calculated based on error budget of variable with Mont Carlo method . While the high-speed（v/H） ratio is 0.3 - 0.5 （1 / s） and the TDI stage is no more than 32, the 3a value of image motion compensation （IMC） error is 16μm,which can satisfy the requirement of remote sensor.