面阵彩色航空遥感相机前向像移补偿机构精度分析

考虑航空遥感相机中前向像移补偿机构的运动精度会直接影响相机分辨率,本文对相移补偿机构的补偿精度进行了分析。首先,研究了面阵彩色航空遥感相机的机械式前向像移补偿机构的特点,给出了对应于曝光时间的前向像移补偿速度残差的许用值;其次,分析了影响像移补偿精度的主要误差来源,建立了速度补偿残差的数学模型,并运用MonteCarlo算法对其进行了仿真分析;最后,通过动态目标发生器成像试验对仿真结果进行验证。试验结果显示,前向像移补偿机构的速度补偿残差3σ为395.6μm/s,与仿真分析结果400μm/s基本一致,说明该精度分析方法可以比较准确地确定前向像移补偿精度。

Accuracy analysis of forward image displacement compensation device for aerial scan color CCD camera

The compensation accuracy of a forward image displacement compensation device in an area scan color CCD camera was analyzed, because it would influence the resolution of the camera directly. The characteristics of the mechanic compensation device were researched, and the allowable residual error of the velocity compensation corresponding exposure time was given. A mathematical model for the residual error of velocity compensation was established after analyzing main error sources of the device, then the error model was simulated by the Monte Carlo method. Finally, the compensation accuracy was verified by an imaging test with a dynamic target simulator. The test results show that the residual error of velocity compensation is 395.6 μm/s, which is coincident with the simulation data 400 μm/s. It is concluded that the method can estimate accurately the matching error accuracy.