卫星摄影测量中偏流角修正余差改正技术

Drift Angle Residual Corrrection Technology in Satellite Photogrammetry

基于立体影像摄影机理,对偏流角修正的剩余误差导致的上下视差进行分析,建立了立体相机偏流角余差改正的数学模型,推导出偏流角余差影响上下视差的误差方程,并重点从相机参数在轨标定和光束法平差中低频误差补偿两方面提出解决措施。理论分析与实际卫星影像试验表明,偏流角改正余差对上下视差影响较大,必须通过相机参数在轨标定和低频误差补偿两方面予以改正,才能保证全球范围无地面控制点目标定位精度的一致性。

Based on the stereo image photography mechanism,the paper analyzes the vertical parallax caused by drift angle correction technical measures,and establishes the mathematical model for residual of drift angle of stereo camera.It derives the error equation that can calculate the drift angle residual's influence on vertical parallax,and put forward solutions from the aspects of camera parameters on-orbit calibration and error compensation of low frequency in bundle adjustment.The theoretical analysis and practical test with real satellite images shows that the correction residual of drift angle has a relatively great influence on vertical parallax,and it must be corrected through camera parameters on-orbit calibration and error compensation of low frequency,so that the accuracy of positioning without ground control point on a global scale can be maintained.