首页|顾及左右摆扫不同影响的航空大视场高分红外扫描仪几何外检校方法

顾及左右摆扫不同影响的航空大视场高分红外扫描仪几何外检校方法

扫码查看
原文链接
  • 万方数据
  • 维普
摆扫航空大视场红外扫描仪具有视场角大、分辨率高等优点,但因在传感器安装、运输、飞行时会受到抖动的影响,常导致传感器的中心、安置角度发生偏移,特别是此类扫描仪不同摆扫方向会对成像质量造成不同影响.因此,有必要对CCD影像进行几何外检校,以提高传感器影像的几何质量.本文针对航空大视场红外扫描仪成像特点,构建了考虑左、右摆扫不同影响的几何外检校模型.该检校模型具有如下特点:(1)左、右摆影像同时检校,并分别设置不同的安置参数矩阵.扫描仪的左、右摆扫会造成成像积分方向的不同,进而导致左、右摆影像定位精度的不一致,因此该模型利用不同的左、右摆参数矩阵,消除摆扫角误差对成像几何精度造成的影响.(2)增加检校参数伪观测方程.由于该航空大视场红外扫描仪存在大摆扫角,随着摆扫角的变化,相机与定位定姿系统安置误差检校参数间可能存在较强相关性,因此引入检校参数伪观测方程来解决参数间的强相关性,提升检校参数的解算精度.实验验证结果表明该检校模型能有效提升影像的几何定位精度,检校后左右摆影像反投影偏差降低到亚像素水平.
Geometric external calibration method for the airborne large-view-field infrared scanner considering different effects of left and right pendulum directions
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.

remote sensingairborne pendulum large-view-field infrared scannerleft-and right-pendulum imagesgeometric external calibrationcalibration parametersback-projection residuals

金雁敏、李益峰、宋正翔、王超、刘世杰、柳思聪、童小华

展开 >

同济大学测绘与地理信息学院,上海 200092

遥感 航空大视场高分红外扫描仪 左右摆扫 几何外检校 检校参数 反投影残差

国家自然科学基金国家高分辨率对地观测系统重大专项

4207137230-H30C01-9004-19/21

2024

10.11834/jrs.20242312

遥感学报
中国地理学会环境遥感分会 中国科学院遥感应用研究所

遥感学报

CSTPCD北大核心
影响因子：2.921
ISSN：1007-4619
年,卷(期)：2024.28(9)