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分析了三线阵立体测绘相机成像原理,针对三线阵立体测绘相机在对地成像过程中存在的前视、正视和后视相机像移速度和偏流角的差异,推导了基于地球椭球的前视、正视和后视相机像移速度和偏流角计算公式。以某三线阵立体测绘相机为例,选取WGS84地球椭球模型,分析了前视相机和后视相机都以正视相机为准调整行周期和偏流角时,像移速度匹配残差和偏流角残差对像质的影响。分析及实验结果表明,以调制传递函数下降5%为约束,当积分级数>2时,应分别调整前视、正视和后视相机的行周期;按正视相机调整前视相机和后视相机的偏流角时,积分级数应取40级以内。
This paper analyzes the imaging principle of the three-line stereo camera. According to the difference of the image shift velocity and the drift angle of the forward-looking, front-facing and rear-view cameras in the imaging process of the three-line array stereo camera, , Front and rear-view cameras like moving speed and drift angle calculation formula. Taking a three-line array stereo camera as an example, the WGS84 earth ellipsoid model is selected to analyze the relationship between the image shift speed matching residual error and the drift angle residual error when the front-view camera and the rear-view camera adjust the line period and the drift angle with respect to the front camera The impact of poor image quality. Analysis and experimental results show that the modulation transfer function is reduced by 5% as the constraint, when the integral series> 2, the line of sight of the forward-looking, front-facing and rear-view cameras should be adjusted separately; the frontal camera and the rear-view camera Drift angle, the integral series should take 40 or less.