摘要
本文分析了TDI CCD相机的偏流角调整过程和偏流角误差匹配的影响因素,依据偏流角误差导致的姿态稳定度偏差对相机成像质量的影响,建立推扫相机像点与物点一一对应的数学模型,根据TDI CCD成像时超出对应像素的横向与纵向偏移量的累加计算,仿真卫星姿态稳定度改变时相机的成像;同时,利用单轴气浮转台和面阵CCD进行成像实验,将实验条件的像移速度与仿真条件的像移速度匹配,并对面阵CCD成像进行偏移量的累加,模拟推扫CCD成像,最后利用图像对比度和互相关相似性测度分析仿真成像与实验成像质量。仿真成像与实验成像在对比度和互相关相似性测度上相差为0.03左右,能较好满足地面卫星相机连调试验的图像仿真。
The process of deviant angle adjustment and the factors of deviant angle matching error were analyzed. Then, the mathematical model for corresponding relation between scanning camera pixels and the point of scenery was established. According to cumulative TDI CCD imaging exceeding the corresponding pixel horizontal and vertical offset, camera imaging was simulated when stability of satellite attitude changed. At the same time, the uniaxial flotation turntable and plane array CCD were used to imaging experiment. The experiment imaging speed should match simulation imaging speed and the offset of plane array CCD imaging was cumulated to simulate CCD push-broom image. At last, we used image contrast and cross-correlation similar measure simulation to analyze experimental imaging quality. Simulation and experimental imaging are just difference only 0.03 in the imaging contrast and cross-correlation similar measure, which can meet the needs of experiments. The model can be further used for image simulation for testing satellite camera on the ground.
出处
《光电工程》
EI
CAS
CSCD
北大核心
2008年第11期45-50,56,共7页
Opto-Electronic Engineering
基金
863重点基金资助项目
