Volume 3 Issue 6
Dec.  2010
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MA Qing-kun, QIAO Yan-feng. Offshore star calibration of electro-optical shipborne theodolite[J]. Chinese Optics, 2010, 3(6): 653-658.
Citation: MA Qing-kun, QIAO Yan-feng. Offshore star calibration of electro-optical shipborne theodolite[J]. Chinese Optics, 2010, 3(6): 653-658.

Offshore star calibration of electro-optical shipborne theodolite

  • Received Date: 21 Jun 2010
  • Rev Recd Date: 13 Oct 2010
  • Publish Date: 20 Dec 2010
  • In order to meet the requirements of offshore calibration for theodolites and to reduce calibration costs, this paper presents a calibration method of shipborne theodolites. Using this method, almost all the work can be carried out at sea. At first, based on FK5 ephemeris, the apparent position of a star can be calculated in real-time. After the coordinate transition, bootstrap values in the measurement system are ready. The algorithm of ship movement is used to keep the stablization of tracking at sea. At the same time, real-time data are acquired and recorded, and the axis errors and system errors of the theodolite can be calculated based on several algorithms. Experimental results indicate that the precisions of the calibration in dry-dock and the star calibration are very close. The tolerances of visual axis error, horizontal axis error and the vertical axis error are 0.015, 0.22 and 0.014, respectively. The star calibration agrees with the former results very well in system errors after calculations. It can satisfy the requirements of offshore calibrating of a ship-based theodolite.

     

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