框幅式航测相机中像移量对直接地理定位精度影响的研究  

Study of the effects on frame aerial photography directgeoreferencing accuracy caused by image motion

作　　者：赵嘉鑫[1,2] 张涛[1] 张景国[1] 远国勤[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所航空光学成像与测量重点实验室,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《红外与激光工程》2015年第2期632-638,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金青年科学基金(61308099)

摘　　要：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, image motion blur due to aircraft forward flight and rotation is one of the error resources in image coordinate measurement, which could lead to misalignment in collinearity equation and accuracy decline in direct georeferencing. For the purpose of analysis the influence of image motion blur on direct georeferencing, the motion blur of frame imagery was modeled based on collinearity equation with consideration of both ration and translation movement. The linearity approximation equation was also derived. Analysis shows that the centroid of smear track could be used as image point in intersection only with mid-exposure time as the nominal photo exposure time to eliminate the blur problem in image measurement. Simulation result shows that maximum RMS in object space could be reduce to 0.12 mm by using the method above.

关 键 词：遥感 像移 共线方程 直接地理定位 航空测绘 

分 类 号：V447.3[航空宇航科学与技术—飞行器设计] TN942.2[电子电信—信号与信息处理]