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Geometric calibration of domestic airborne wide-field three-linear CCD camera

  • role： First author第一作者
  • Affiliation：

    Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China

  • Email：wangtaoynl@163.com
  • Introduction：王涛，1975年生，男，教授，研究方向为航空航天遥感工程、遥感几何定标定位技术、遥感信息处理与应用等。E-mail: wangtaoynl@163.com
WANG Tao1,  
  • Affiliation：

    Data and Object Engineering Institute, Information Engineering University, Zhengzhou 450052, China

ZHANG Yan2,  
  • Affiliation：

    Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China

ZHANG Yongsheng1,  
  • Affiliation：

    Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China

MO Delin1,  
  • Affiliation：

    Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China

YU Ying1

résumé

The development and application of three-line array CCD （Charge-coupled Device）sensor is an important direction in remote sensing, surveying, and mapping. The objective of this study is to investigate the geometric calibration technology of the first Chinese self-developed airborne three-line array CCD camera (hereinafter referred to as GFXJ).In this study, a series of innovative research works is conducted on the geometric calibration technology of the domestic GFXJ camera. First, a comparative analysis is made on the imaging characteristics and geometric deformation factors of the GFXJ camera. Upon this camera, a piece-wise self-calibration model based on CCD tilt angle is established. The piece-wise self-calibration model absorbs the influence of various geometric distortion factors by using a segmented mathematical model to avoid over-parameterization and strong inter-correlation. At the CCD segment boundary, the model satisfies the equivalent and the smoothing constraints.Then, an iterative two-step calibration scheme is proposed to achieve stable and reliable calibration values. The aerial triangulation of exterior orientation elements and the calibration of additional self-calibrating parameters are performed independently and iteratively. The iterative two-step calibration process is implemented until the exterior orientation elements and additional calibration parameters reach stability and the changes between the two iterations are less than the threshold.Multiple sets of flight experimental data were obtained from the China Songshan remote sensing comprehensive field and Hegang area of Heilongjiang Province. The proposed iterative two-step calibration scheme was applied to set accurately the tilt angle calibration of each CCD detector in the forward, nadir, and backward CCD arrays. Reliable CCD image pixel coordinate files were generated for forward, nadir, and backward arrays independently.Experiment results showed that after calibration, uncontrolled image positioning precision can be greatly improved. Supported by several control points for bundle block adjustment, the image positioning accuracy of GFXJ camera can meet the 1:1000 scale topographic mapping requirements on aerial triangulation.From experimental results, we draw the following conclusions. First, the proposed piece-wise self-calibration model based on CCD viewing angle and the iterative two-step calibration scheme are suitable and efficient for the GFXJ camera. The geometric distortion factors, such as lens distortion, CCD rotation, and scaling, affect the accuracy of the height and positioning of the GFXJ camera and planar positioning, respectively. The piece-wise self-calibration calibration model based on tilt angles and the iterative two-step calibration scheme proposed in this study can effectively calibrate the inherent lens and CCD distortion errors of the GFXJ camera. Second, the GCPs layout scheme of “four corners” can ensure the aerial triangulation accuracy of GFXJ, but denser GCPs layout scheme had little contribution to accuracy improvement. Third, the calibrated CCD image pixel coordinate files can serve as a qualified and reliable calibration product for subsequent users. At the same time, the calibration method and research results proposed in this study can serve as reference for the geometric calibration research of other airborne three-linear array CCD cameras.

mots-clés

remote sensing;airborne three-line array CCD camera;piece-wise self-calibration model;geometric calibration;China Songshan remote sensing comprehensive field;iterative two-step calibration scheme

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