机载线阵CCD相机的POS系统误差自检校

The Self-calibration of POS Systematic Errors for Airborne Line Array Sensor

从直接定向技术的原理出发,分析了POS系统误差产生的原因,在此基础上建立了补偿POS位置、姿态测量误差的数学模型,并通过POS辅助多线阵影像光束法平差实现了对POS系统误差的一步法检校。ADS40数据的实验结果表明,检校IMU偏心角不需要控制点参与。引入同架次、同航高检校场的标定结果改正POS数据之后,POS辅助直接定位的精度可达1像元左右,接近常规光束法平差的水平。

The systematic error sources of POS unit are discussed at first according to the principle of direct georeferencing,based on which the mathematic model to compensate these systematic errors of POS position and attitude data is provided.The POS supported bundle adjustment of multi-line array images with orientation image method is adopted to carry out one-step calibration of POS systematic errors.Experimental results from two ADS40 datasets show that no ground control points are needed for IMU boresight misalignment calibration.Once the POS data been corrected using the calibration results determined by a POS mounting bias calibration at the same flight and same fly height,the DG accuracy of about 1 pixel can be achieved,which is the same level as classical bundle adjustment.