Volume 5 Issue 4
Aug.  2012
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YANG Xiu-bin, CHANG Lin, JIN Guang. Influence of dynamic imbalance of SGCMG rotor on remote sensing satellite imaging[J]. Chinese Optics, 2012, 5(4): 358-365. doi: 10.3788/CO.20120504.0358
Citation: YANG Xiu-bin, CHANG Lin, JIN Guang. Influence of dynamic imbalance of SGCMG rotor on remote sensing satellite imaging[J]. Chinese Optics, 2012, 5(4): 358-365. doi: 10.3788/CO.20120504.0358

Influence of dynamic imbalance of SGCMG rotor on remote sensing satellite imaging

doi: 10.3788/CO.20120504.0358
  • Received Date: 11 May 2012
  • Rev Recd Date: 13 Jul 2012
  • Publish Date: 10 Aug 2012
  • The influence of vibration angles and vibration angle velocities caused by the dynamic imbalance disturbing torques of a rotor for the Single Gimbal Control Moment Gyro on the TDI CCD camera imaging is analyzed. By coordinate transformation, the disturbance torque is transformed from a rotor coordinate to a satellite coordinate, and then satellite attitude dynamics equations are used to calculate the vibration angular displacements and vibration velocities of stars in an image motion compensation model of the TDI CCD camera. TDI CCD camera simulation system with the material point corresponding to imaging point model is used to analyze the imaging MTF and mutual correlation similarity measure. Experiments show that when SGCMG rotor speed rotates at 3 000 r/min, the MTF horizontal shift is 0.997 and mutual correlation similarity measure is 0.996 1; When SGCMG rotor speed rotates at 6 000 r/min, the MTF horizontal shift is 0.928 3, mutual correlation similarity measure is 0.974 8. The results prove that the quality of TDI CCD scanning images is terribly influenced by vibration angles and angle velocities caused by the dynamic imbalance of the SGCMG rotor. It must carry a damping when the SGCMG is used.

     

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