利用双高度层ADS40影像实现无控制点高精度定位

Highly precise positioning without GCPs using ADS40 images from two flight levels

ADS40是一款目前广泛应用的三线阵机载数字航测相机,集成了高精度的POS系统,大大降低了对地面控制点的依赖。尽管在无控制点时,利用ADS40影像进行空中三角测量的精度已经相对较高,但仍然难以满足大比例尺、高精度测图;常规的方法是引入少量控制点,利用自检校光束法区域网平差来提高ADS40定位精度。本文将结合ADS40相机的特点,利用双高度层的ADS40影像实现完全不依赖控制点的高精度定位。

ADS40 which is integrated with POS is a kind of three-line-scanner CCD digital airborne sensor and widely used in photogrammetry in recent decades. Because of the POS, ADS40 greatly reduces the dependence on the amount of GCP. Although, the accuracy of the aerial triangulation using ADS40 images without GCP is comparatively high, it is still difficult to fulfill the needs of large-scale and highly precise mapping. The common method to improve the accuracy of the ADS40 is to import small amount of GCPs and use self-calibrated bundle block adjustment. According to the characteristic of ADS40, a method which uses the ADS40 images from two flight levels to triangulate was proposed to achieve highly precise mapping without GCPs in the paper.