面阵图像定位精度提升方法研究

为了提升面阵相机成像定位精度,以吉林省松原市北部区域的机载面阵图像为实验对象,对成像过程进行误差分析与标定. 机载面阵相机成像存在由三个姿态角引起的定位误差以及由相机镜头畸变等因素产生的畸变误差. 针对以上问题,首先采用严密几何模型,得到面阵图像初步成像结果;然后,采用后方交会和多项式附加参数模型等方法解决内、外方位元素引起的误差问题,得到较为精确的定位结果;最后进行实验验证,测试结果表明,经过内、外方位元素的误差定标,能够控制在5 m以内的范围,精度提升94.37％,处理效果显著. 通过研究标定面阵成像过程中内、外方位元素产生的误差,提高了面阵相机定位精度,对面阵相机成像的应用和推广具有一定价值和科学参考依据. 

Research on improvement method of positioning accuracy of area array image

To improve the imaging positioning accuracy of the area array camera, the airborne area array image of the northern part of Songyuan City, Jilin Province is taken as the experimental object to analyze the error and calibration of the imaging process. The imaging location of airborne area array camera has large offset errors caused by three attitude angle errors of the outer orientation elements and small distortion errors caused by internal orientation elements, such as camera lens distortion. Aiming at the above problems, the rigorous geometric positioning model is firstly used to obtain the preliminary positioning results of the area array image. Then, the resection and polynomial additional parameter models are used to solve the error caused by the internal and external orientation elements, and the more accurate positioning results are obtained. Finally, the experimental verification is carried out. The test results show that after the error calibration of the internal and external azimuth elements, the accuracy can be controlled within 5 m, and the accuracy can be improved by 94.37％. The treatment effect is remarkable. By studying the error generated by the internal and external orientation elements in the calibration area array imaging process, the positioning accuracy of the area array camera is improved, which has certain value and scientific reference for the application and promotion of area array camera imaging.