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摘要

引用本文:

DOI:

10.11834/jrs.20208277

收稿日期:

2018-07-04

修改日期:

2018-10-10

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国产机载大视场三线阵CCD相机几何标定
王涛
信息工程大学地理空间信息学院
摘要:

发展和应用三线阵CCD传感器是当前遥感测绘的一个重要方向,在机载三线阵CCD相机的研制和技术处理方面,目前仍然是进口ADS系列相机占据主流。本文针对国内首台自主研制的机载三线阵CCD相机(以下简称GFXJ),首创性地开展了国产GFXJ相机几何标定技术研究。文中首先对比分析了GFXJ相机的成像特点和几何变形因素,在此基础上建立了基于CCD指向角的分段自检校标定模型;然后提出了循环两步法标定方案;最后在嵩山遥感综合实验场和黑龙江鹤岗地区获得了多组飞行实验数据,采用循环二步法对GFXJ相机前、下及后视CCD每一像元指向角进行了准确标定,并生成可靠的CCD像点坐标文件。实验表明,本文提出的基于CCD指向角的分段自检校标定模型和循环两步法标定方案对于GFXJ相机具有良好的适用性和有效性,标定后可大幅提高影像无控定位精度;辅以少量控制点进行区域网平差,GFXJ影像定位精度可满足1:1000地形图测图的空中三角测量精度要求。同时本文建立的标定模型和标定方案可为其它机载线阵CCD相机的标定处理提供借鉴。

Geometric Calibration of Domestic Airborne Wide-field Three-Linear CCD Camera
Abstract:

In the current remote sensing surveying and mapping, development and application of three-line array CCD sensor is an important direction. But in the investigation and technical processing of airborne three-line array CCD camera, it is still the imported ADS series cameras occupying the mainstream. In this paper, focusing on the first China self-developed airborne three-line array CCD camera (hereinafter referred to as GFXJ), a series of innovative research work is carried out on the geometric calibration technology of domestic GFXJ camera. Firstly, a comparative analysis is made on the imaging characteristics and geometric deformation factors of GFXJ camera. Upon this, a piece-wise self-calibration model based on CCD tilt angle is established. Then, an iterative two-step calibration scheme is proposed. Finally, multiple sets of flight experimental data were obtained in the Songshan national remote sensing comprehensive field and Hegang area of Heilongjiang Province. The proposed iterative two-step calibration scheme was applied to accurate tilt angle calibration of each CCD detector in the forward, nadir and backward CCD array, and reliable CCD image pixel coordinate files was generated for forward, nadir and backward array independently. Experiments show that the piece-wise self-calibration model and the iterative two-step calibration scheme proposed in this paper have good applicability and effectiveness for GFXJ cameras. After calibration, the 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. At the same time, the calibration model and calibration scheme established in this paper can provide reference for calibration study of other airborne linear array CCD cameras.

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