Distortion consistency correction technique for ultra-wide field of view off-axis optical system

In order to meet the requirements of ultra-wide field of view and high resolution dynamic monitoring in coastal zone, high resolution and wide coverage has become an important development trend of spatial optical remote sensors. The combination of two cameras was adopted by the HY-1C/D satellite coastal zone imager to realize the large width. The single camera is an 32° off-axis optical system with an ultra-wide field, and the camera has a large arc distortion. The distortion consistency correction technique for ultra-wide field of view off-axis optical system was mainly studied. The adjustment method of multivariate simulation-high precision measurements-interactive iteration was proposed, and the multivariable full-link simulation calculation with image quality, visual axis and distortion was carried out. Through the high precision distortion measurement system, the interactive iteration adjustment of the distortion compensation was realized, the problem of uncontrollable distortion in lens adjustment stage was solved, and the double camera distortion consistency control precision was better than 0.1%, which completely meet the test technical requirements. The results show that this method is reasonable and feasible.