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Geometric external calibration method for the airborne large-view-field infrared scanner considering different effects of left and right pendulum directions

  • role： First author第一作者
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

  • Email：jinyanmin@tongji.edu.cn
  • Introduction：金雁敏，研究方向为空间数据质量控制。E-mail： jinyanmin@tongji.edu.cn
JIN Yanmin,  
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

LI Yifeng,  
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

SONG Zhengxiang,  
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

WANG Chao,  
  • role： Corresponding author通信作者
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

  • Email：liusjtj@tongji.edu.cm
  • Introduction：刘世杰，研究方向为摄影测量与遥感。E-mail： liusjtj@tongji.edu.cm
LIU Shijie*,  
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

LIU Sicong,  
  • Affiliation：

    College of Surveying and Geo-Informatics, Tongji University, Shanghai 200092, China

TONG Xiaohua

Resümee

An airborne pendulum large-view-field infrared scanner has the advantages of large view field and high-resolution images. However, it may be affected by various factors during sensor installation, transportation, and flight, which may cause the position centers and angles of the sensor and the POS system to be changed. Therefore, geometric calibration must be performed to improve the geometric quality of the images acquired by the sensor. Furthermore, this scanner produces left-pendulum and right-pendulum images, respectively, during the flight. Moreover, the left-pendulum and right-pendulum images have different imaging integration directions, which may cause different influence on imaging quality. Therefore, this study presents an external geometric calibration method considering different influences of the different pendulum directions.By considering different influences of the different pendulum directions of this airborne pendulum large-view-field infrared scanner, a geometric external calibration model is introduced, and it is characterized by the following: (1) The installation errors of the sensor and POS are considered. Moreover, the left- and right- pendulum images are used to calculate the installation parameters. Especially, different calibration parameters are used for the right- and left-pendulum images. The aim is to compensate for the different influences caused by different imaging integration directions. (2) Furthermore, calibration parameters for the installation errors of the sensor and POS are regarded as pseudo-observations because the installation errors of the sensor and POS are generally small. By regarding the calibration parameters as the pseudo-observations, the calibration model can avoid large unreasonable estimated parameters.The proposed method is applied in the calibration of the images collected by this airborne pendulum large-view-field infrared scanner. Experimental results show that the calibration model can effectively improve the geometric positioning accuracy of the images. The absolute average back-projection residuals of the control points in the left- and right- pendulum images are improved to be subpixel level.

Schlüsselwort

remote sensing;airborne pendulum large-view-field infrared scanner;left- and right- pendulum images;geometric external calibration;calibration parameters;back-projection residuals

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