On orbit geometric calibration of HRC-CBERS 2B sensor

The geospatial information extraction from orbital images requires the internal and external orientation. The external orientation parameters (EOPs) can be obtained directly from GNSS/INS and star sensors, or indirectly by control features in the object space. The interior orientation parameters (IOPs) are first determined from laboratory calibration process prior the satellite launch, and can be estimated by the periodically on-orbit geometric calibration. This paper aimed to perform the on-orbit geometric calibration of the HRC-CBERS 2B sensor. The corrections of systematic effects caused by the focal plane of the sensor and by lens system were considered in the calibration process. A dense number of ground control and check points are used, and the accuracy analysis of the planimetric checkpoints was then applied to evaluate the calibration. Four experiments are performed analyzing three different groups of IOPs. The results obtained from calibration experiments were similar and did not shown significant differences. A slightly highest accuracy was obtained when the group of IOPs was used considering the translation, rotation, scale factor and bending of the CCD chips, with symmetric radial distortion of the lens system

Keywords:
UCL model; HRC camera; on orbit geometric calibration.