机载三线阵CCD摄影测量的直接解模型与精度分析

Direct Georeferencing Model and Its Precision Analysis of Airborne TLS Photogrammetry

机载三线阵CCD摄影测量系统是GPS/INS与三线阵CCD相机联合工作的测量系统.通过GPS/INS给出的投影中心位置、视准轴姿态观测值及三线阵CCD像空间坐标,可以直接计算地面点在物空间的坐标.介绍直接解算的几何模型,并依据共线方程建立地面点像空间坐标与控制点或同名点物空间坐标的关系,从而把问题归结为间接平差,给出了平差的误差方程.最后对直接解算模型进行了精度分析.

Airborne three-line CCD scanner system is integrated by GPS/INS and three-line CCD camera. One can get the coordinates of object points on the ground directly assisted by the measurements of the perspective center position and the attitude of boresight given by GPS/INS. This paper introduces direct georeferencing model and gives the connection between imagery coordinates and objective coordinates of the ground points according to the colinearity equations, so that the problem can be solved by indirect adjustment. At last, the precision of objective coordinates is analyzed about direct georeferencing model.