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为满足单线阵CCD相机立体测绘定位的需求,研究了相机几何误差对定位精度的影响,并建立了它们之间的数值模型,为相机的几何指标分析和量化提供理论支持。首先针对单线阵立体成像特点,分析了几何标定和像点量测误差对定位结果的影响;然后以前方空间交会公式为基础,推导出定位精度评估模型。该模型给出了定位精度随几何标定和像点量测误差的变化规律;最后以IKONOS卫星为应用算例,验证了模型的正确性。
In order to meet the need of single-line CCD camera’s stereoscopic mapping positioning, the influence of camera geometric errors on the positioning accuracy is studied and the numerical model between them is established to provide theoretical support for the analysis and quantification of the camera’s geometric indices. Firstly, according to the characteristics of single-line stereo imaging, the influence of geometrical calibration and image point measurement error on the positioning result is analyzed. Based on the front-end space intersection formula, the positioning accuracy evaluation model is deduced. The model gives the variation of positioning accuracy with geometric calibration and image point measurement error. Finally, IKONOS satellite is used as an example to verify the correctness of the model.