ALOS PRISM影像直接定位的系统误差分析

摘要

利用ALOS PRISM影像进行直接对地定位时必须考虑系统误差的检校.从ALOS卫星PRISM传感器的成像原理出发,分析了利用严格几何模型进行定位时可能存在的系统误差；然后用3个不同的检校模型对系统误差进行校正.实验表明利用少量控制点剔除系统误差后,定位精度明显提高,在X方向达到3m左右,在Y方向和Z方向不超过2 m.%The calibration of constant error must be taken into account by using the ALOS PRISM Imagery for direct georeferencing. From the imaging theory of the ALOS PRISM sensor, the systematic errors that may be exist by using the rigorous geometric model for direct georeferencing were analyzed. Three different calibration models were used to analyze and correct the systematic errors. Experimental results showed that there were constant systematic errors existed in imagery ancillary data. Once the systematic errors are eliminated using some ground control points, the results are improved noticeably. The indices is about 3 m in X direction, better than 2 m in Y direction and Z direction.