扫描镜稳定性对TDI CCD系统测量精度的影响

贺小军 He Xiaojun, 曲宏松 Qu Hongsong, 张贵祥 Zhang Guixiang, 王金玲 Wang Jin-ling
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引用次数: 0

摘要

利用TDI CCD成像的数值模拟模型,研究了TDI CCD测量系统中扫描镜的速度稳定性与角度测量精度之间的关系。首先,基于TDI CCD推扫成像的物理过程,建立了从光学图像、扫描镜稳定性到数字图像的整个过程的数值模拟模型,计算了图像重心,得到了目标角坐标;采用蒙特卡罗方法完成了仿真实验,统计结果可以描述扫描镜的稳定性与测量精度之间的关系。最后将某工程扫描镜的速度稳定性代入仿真模块,仿真结果表明误差增加了5倍。67 μrad,达到1 /4像素角分辨率。因此在高精度测量中,需要综合考虑像元角分辨率和速度稳定性的影响。为满足像素角分辨率的要求,选择了合适的扫描镜速度稳定性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Impact of scan mirror stability on TDI CCD system measure accuracy
Numerical simulation model of TDI CCD imaging is used to study the relationship between the speed stability of the scanning mirror and angle measurement accuracy in a TDI CCD measurement system. First,based on the physical process of TDI CCD push-broom imaging,a numerical simulation model is established to describe the whole process from optical image and scan mirror stability to digital images,and then gravity centre of image is calculated and the target angular coordinate is got; Monte Carlo method is used to complete a simulation experiment,and the statistical results could describe the relation between stability of the scanning mirror and measure accuracy. In the end,the speed stability of an engineering scanning mirror is substituted into the simulation module,and the simulation results show that the error increases by 5. 67 μrad,reached 1 /4 of pixel angular resolution. So in high-precision measurement,the comprehensive influence of the pixel angular resolution and the speed stability of the speed stability need to be considered. The appropriate speed stability of the scanning mirror showed be chosen to meet the requirement of pixel angular resolution.
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