Research on active thermal deformation control technology for ultra large spaceborne antennas

A solution combining a segmented reflective surface structure and active control technology is proposed to address the problem of surface accuracy for ultra large spaceborne antennas caused by the spatial thermal environment. By implementing a block-based design to reduce overall thermal deformation errors, a three-degree-of-freedom single-point support structure is introduced to achieve active pose adjustment, and an active control method for surface errors is established. The simulation results show that the combination of block structure and low-expansion microcrystalline glass material can reduce the thermal deformation surface error to 0.12 μm (90 °C working condition), and the active control technology can effectively converge the pose error of multiple reflective surfaces, controlling the overall surface error at the micrometer level. This method provides a new approach for the high-precision design of large-sized spaceborne antennas.