ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa


Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 1, pp. 203-214

Calibration of Kanopus-V satellite sensor during its operation

A.I. Vasilyev1 
1 JSC CTT Group, Moscow, Russia
In the paper, the calibration problem of the Kanopus-V satellite sensor is considered. There are distinctive features of this instrument: 1) several view fields – 6 non-overlapping CCD matrix sensors in the focal plane; 2) significantly narrow-angle optical system – the field of view is less than 3°. It is shown that the traditional reprojection error minimization approach is inapplicable to calibrate this camera since it leads to significant errors of microframes (produced by each CCD-sensor) positions – more than 1000 pixels displacement. Taking into account satellite navigation data and pre-launch calibration results allows to reconstruct the microframes positions with an accuracy of 15 pixels (3σ).
The camera parameters reconstruction based on the ground control points for the given district area (Pyatigorsk) is described. The reconstructed camera model was used for mosaic formation on the basis of processing technology for the frame aerial photography data. The processing technology includes several key steps: 1) the single frame formation based on microframes and its known positions relative to the principal point; 2) tie points searching between single frames; 3) phototriangulation; 4) single frames transformation and stitching. The described technology was applied for the mosaic formation from the Kanopus-V data in the Memphis area. On the resulting mosaic, breaklines were observed (RMSE of breakpoints ~7 pixels). These breaklines are conditioned by the low accuracy of the camera calibration, in particular, the accuracy of microframes positions relative to the principal point is ~5 pixels (1σ).
In the paper, to form the mosaics without breaklines it is suggested to consider the complex optical system with 6 view fields as 6 independent frame cameras. Based on the suggested modified approach, we succeeded to form the mosaics without breaklines (RMSE of reprojection error on tie points is ~1 pixel).
Keywords: «Kanopus-V» satellite, calibration, narrow-angle camera, several view fields.
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