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在航空摄影测量中,载机前向飞行和姿态旋转引起的像移模糊会为同名像点的量测引入误差,使共线方程偏离共线的条件,进而导致直接地理定位的精度下降。为定量分析像移对物点直接定位的影响,从摄影测量的共线方程出发,在充分考虑前向飞行和姿态旋转的条件下,建立了框幅式相机中CCD靶面各点像移量的数学模型。根据该模型计算出像移轨迹中的质心坐标和其对应的曝光时标,并以质心确定同名像点坐标,以中心曝光时间作为曝光时标以获得对应的外方位元素。仿真结果表明,在理想条件下,以上述方法进行双像前方交会的物方定位误差最大为0.12 mm,有效降低了像移对直接地理定位的影响。文中为分析框幅式航测相机中像移量对位置精度的影响和曝光时标的确定提供了理论依据。
In aerial photogrammetry, the image motion blur caused by the forward flight and attitude rotation of the aircraft introduces errors to the measurement of the same name point, which causes the collinearity equation to deviate from the collinear condition, which leads to the decrease of the precision of the direct geolocation. In order to quantitatively analyze the influence of image shift on the direct location of object points, starting from the collinearity equation of photogrammetry, under the condition of fully considering forward flight and attitude rotation, Mathematical model. Based on the model, the centroid coordinates and corresponding exposure time scales in the image are calculated and the centroid is used to determine the coordinates of the same name. The center exposure time is used as the exposure time scale to obtain the corresponding exterior orientation elements. The simulation results show that under the ideal conditions, the maximum error of the object location in the forward cross-bifurcation with the above method is 0.12 mm, which effectively reduces the impact of image shift on direct geolocation. The paper provides a theoretical basis for the analysis of the influence of the image shift amount on the position accuracy and the determination of the exposure time scale in the framed aerial camera.