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离轴反射式双线阵立体测绘相机的视轴和光轴分离,由于地球为椭球体,视轴和光轴对应的地物点的距离随星下点与升交点的地心角而变化。而成像传感器与光轴垂直,对视轴对应的地物点成像,这些因素导致离轴反射式双线阵立体测绘相机的像移速度和偏流角随离轴角等变化。在对离轴反射式空间相机的成像原理进行分析的基础上建立其等效简化模型,推导了基于地球椭球的离轴反射式双线阵立体测绘相机的像移速度和偏流角计算公式。并以某离轴反射式双线阵立体测绘相机为例,对正视相机和后视相机统一调整行周期与偏流角对成像质量的影响进行分析。分析结果表明,以调制传递函数下降不超过5%为约束,当积分级数大于4时应分别调整正视相机和后视相机的行周期。统一调整偏流角时应以正视相机和后视相机偏流角的均值为准,积分级数应取89以内。
The separation of the optic axis from the optical axis of the off-axis reflective dual-line stereoscopic camera means that the distance between the object point corresponding to the optic axis and the optic axis varies with the angle of the astronomical point of the ascending point and the ascending point due to the ellipsoid of the earth. The imaging sensor is perpendicular to the optical axis and images the object points corresponding to the boresight. These factors cause the image shift speed and drift angle of the off-axis bistatic stereo camera to vary with the off-axis angle. Based on the analysis of the imaging principle of the off-axis reflecting space camera, an equivalent simplified model is established and the formulas for calculating the image shift velocity and the drift angle of the off-axis reflecting dual line array stereo camera based on the Earth ellipsoid are deduced. Taking an off-axis reflecting dual line array stereo camera as an example, the influence of the normal camera and rearview camera on the image quality is analyzed by adjusting the line period and the drift angle. The analysis results show that the modulation transfer function is limited to 5% or less, and the line period of the front-view camera and rear-view camera should be adjusted separately when the integral series is greater than 4. Unified adjustment of drift angle should be the front of the camera and rear view camera drift angle prevail, the integral series should be taken within 89.