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针对星载三线阵相机结构特点,提出一种新的三线阵相机体系空间方位表达形式,其中采用正视相机的外方位元素以及前、后视相机相对于正视相机的投影中心空间偏移量和相对旋转角共18个定向参数,以体现三线阵相机体系在动态成像过程中的内部几何关联。将该形式引入摄影测量光束法平差模型,有利于减少三线阵相机在多基线观测情况下的定向参数,提高定向解算的稳定性。仿真数据试验结果表明,文中提出的定向模型在同等的地面控制条件下能有效提高三线阵相机的摄影测量精度,为三线阵影像的几何处理提供新的技术途径,可望在三线阵影像空间信息提取中得到应用。
Aiming at the structural characteristics of the spaceborne three-line array camera, a new spatial orientation representation of the three-line array camera system is proposed, in which the out-of-plane elements of the frontal camera and the projection center space offset of the front and rearview cameras relative to the frontal camera are used, Rotation angle of a total of 18 orientation parameters to reflect the three-line camera system in the dynamic imaging of the internal geometric correlation. The introduction of this form into the photogrammetric beam method adjustment model is conducive to reduce the directional parameters of the three-line array camera in the case of multi-baseline observations to improve the stability of the directional solution. The simulation results show that the proposed model can effectively improve the photogrammetric accuracy of the three-line array camera under the same ground control conditions and provide a new technical approach for the geometric processing of the three-line array image. It is expected that the three-line array spatial information Extraction is applied.