Laser beams (L11, L21) parallel to each other are incident on the telescope (200) from different positions. The laser beams (L12, L22) are incident on the secondary mirror attitude detection mirror (127) from mutually different positions. The laser beam detectors (128, 129) detect the laser beams reflected by the secondary mirror attitude detection mirror (127). The first attitude calculation unit (130) obtains the variation amount of the attitude of the secondary mirror (230) based on the detection results of the laser light detectors (128, 129). The laser beam detectors (134, 135) are incident on the telescope (200) and detect the laser beams reflected by the primary mirror (220) and the secondary mirror (230). Based on the detection results of the laser light detectors (134, 135) and the detection results of the laser light detectors (128, 129), the second attitude calculation unit (136) calculates the attitude of the main mirror (220) Find the variation.
展开▼
