On-orbit geometric calibration of linear push-broom optical satellite only using sparse GCPs

doi:10.11947/j.AGCS.2019.20180332

Abstract

Abstract:

The paper presents a geometric calibration method based on the sparse ground control points (GCPs), aiming to the linear push-broom optical satellite. This method can achieve the optimal estimate of internal and external parameters with two overlapped image pair along the charge-coupled device (CCD), and sparse GCPs in the image region, further get rid of the dependence on the expensive calibration site data. With the calibrated parameters, the line of sight (LOS) of all CCD detectors can be recovered. This paper firstly establishes the rigorous imaging model of linear push-broom optical satellite based on its imaging mechanism. And then the calibration model is constructed by improving the internal sensor model with viewing-angle model after an analysis on systematic errors existing in the imaging model is performed. A step-wise solution is applied aiming to the optimal estimate of external and internal parameters. At last, we conduct a set of experiments on ZY-3 NAD camera, and verify the accuracy and effectiveness of the presented method by comparison.

Key words: optical satellite, on-orbit geometric calibration, overlapped image pair, sparse GCPs, viewing angle

CLC Number:

P231

PI Yingdong, XIE Baorong, YANG Bo, ZHANG Yiling, LI Xin, WANG Mi. On-orbit geometric calibration of linear push-broom optical satellite only using sparse GCPs[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(2): 216-225.

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