On-Orbit Geometric Calibration of ZY-3 Three-Line Array Imagery With Multistrip Data Sets
On-Orbit Geometric Calibration of ZY-3 Three-Line Array Imagery With Multistrip Data Sets
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DOI：
10.1109/tgrs.2013.2237781
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发表时间：
2014
影响因子：
8.2
通讯作者：
Yongjun Zhang;M. Zheng;Jinxin Xiong;Yihui Lu;Xiaodong Xiong
中科院分区：
文献类型：
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作者：
Yongjun Zhang;M. Zheng;Jinxin Xiong;Yihui Lu;Xiaodong Xiong
2012年1月9日发射的ZY-3是中国第一颗立体测绘卫星。使用机载三线相机（TLC）图像进行直接地理定位的初始精度较低。利用光束法区域网平差进行传感器几何标定，提高了地理定位精度。提出了一种新的敏感器在轨标定方法，该方法可以对航天器与薄层色谱仪之间的失调角以及电荷耦合器件的失调进行校正。所有的校准过程都使用多条数据集进行。控制点是从现有的数字正射图和数字高程模型自动匹配的。为了充分评价不同校正方法的精度，以校正后的参数为输入数据，对ZY-3型薄层层析成像仪共19条数据进行了地理定位和光束法平差。引入系统误差补偿模型作为光束法平差中的传感器模型，对位置和姿态误差进行补偿。大量的实验表明，新的校准模型可以大大提高直接地理定位的外部精度从公里级优于20米的平面和高度。使用这些校准参数，使用中等精度地面控制点（GCPs）进行进一步的光束法区域网平差，可以实现约4 m的平面和3 m的高度的外部精度。通过使用高精度GCPs的光束法平差，可以实现约1.3 m的平面精度和1.7 m的高度精度。
ZY-3, which was launched on January 9, 2012, is the first stereo mapping satellite in China. The initial accuracy of direct georeferencing with the onboard three-line camera (TLC) imagery is low. Sensor geometric calibration with bundle block adjustment is used to improve the georeferencing accuracy. A new on-orbit sensor calibration method that can correct the misalignment angles between the spacecraft and the TLC and the misalignment of charge-coupled device is described. All of the calibration processes are performed using a multistrip data set. The control points are automatically matched from existing digital ortho map and digital elevation model. To fully evaluate the accuracy of different calibration methods, the calibrated parameters are used as input data to conduct georeferencing and bundle adjustment with a total of 19 strips of ZY-3 TLC data. A systematic error compensation model is introduced as the sensor model in bundle adjustment to compensate for the position and attitude errors. Numerous experiments demonstrate that the new calibration model can largely improve the external accuracy of direct georeferencing from the kilometer level to better than 20 m in both plane and height. A further bundle block adjustment with medium-accuracy ground control points (GCPs), using these calibrated parameters, can achieve external accuracy of about 4 m in plane and 3 m in height. Higher accuracy of about 1.3 m in plane and 1.7 m in height can be achieved by bundle adjustment using high-accuracy GCPs.