CAJ | 학술논문

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。
리축반사식쌍선진입체측회상궤적시축화광축분리，유우지구위타구체，시축화광축대응적지물점적거리수성하점여승교점적지심각이변화。이성상전감기여광축수직，대시축대응적지물점성상，저사인소도치리축반사식쌍선진입체측회상궤적상이속도화편류각수리축각등변화。재대리축반사식공간상궤적성상원리진행분석적기출상건립기등효간화모형，추도료기우지구타구적리축반사식쌍선진입체측회상궤적상이속도화편류각계산공식。병이모리축반사식쌍선진입체측회상궤위례，대정시상궤화후시상궤통일조정행주기여편류각대성상질량적영향진행분석。분석결과표명，이조제전체함수하강불초과5%위약속，당적분급수대우4시응분별조정정시상궤화후시상궤적행주기。통일조정편류각시응이정시상궤화후시상궤편류각적균치위준，적분급수응취89이내。
As view axis and optical axis of reflective off-axis two-line stereo mapping camera are separate and the earth is in fact an ellipsoid, distances between objects on earth corresponding to view axis and optical axis vary with geocentric angle from substellar to ascend point. In addition imaging sensor is perpendicular to optical axis while imaging the objects on earth corresponding to view axis. All these factors lead to change of image motion speeds and drift angles along with off-axis angles. Equivalent simplified model of reflective off-axis space camera was established based on analysis of its imaging principle. Formulas of image motion speeds and drift angles of reflective off-axis two-line stereo mapping camera based on earth ellipsoid were deduced. Influence of adjusting row transfer periods and drift angles uniformly on imaging quality of a reflective off-axis two-line stereo mapping camera was analyzed. Results of analysis indicates that if no more than 5% drop of modulation transfer function is used as a constraint, row transfer periods of nadir-view camera and backward-view camera should be adjusted individually as TDI stages is greater than 4. When drift angles are adjusted uniformly, mean value of drift angles of nadir-view camera and backward-view camera should be used and TDI stages should not exceed 89.