Photogrammetry form of paraboloid antenna in vacuum cryogenic environment

In order to improve measurement accuracy of deformation for large parabolic satellite antenna in vacuum and cryogenic environment, photogrammetry form is studied in this paper, which is one of main factors has effect on accuracy. Theory analysis show that surrounding network has an advantage over strip network in improving accuracy of deformation measurement of parabolic antenna. To verify this analysis, contrast test for different network is designed, moving mechanism is set up, and antenna model with diameter of 5 m is measured. Repeatability of shape error and length error are used as evaluation standard in contrast test. Measuring conclusion is consistent with the aboved analysis.