Effect and Simulation of the Deviant Angle Error on TDI CCD Cameras Image
Effect and Simulation of the Deviant Angle Error on TDI CCD Cameras Image
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发表时间：
2008
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通讯作者：
J. Guang
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作者：
J. Guang
分析了偏角调整过程及偏角匹配误差的影响因素。建立了扫描相机像素与景物点对应关系的数学模型。根据TDI CCD累积成像量超过相应像素水平和垂直偏移量的情况，对卫星姿态稳定度变化时相机成像进行了仿真。同时，利用单轴气浮转台和面阵CCD进行了成像实验。实验成像速度应与仿真成像速度相匹配，并将面阵CCD成像的偏移量累加，模拟CCD推扫成像。最后，利用图像对比度和互相关相似性测度模拟分析了实验成像质量。仿真和实验成像在成像对比度和互相关相似度上仅相差0.03，可以满足实验需要。该模型可进一步用于卫星相机地面测试的图像仿真。
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.