Study on Non-uniform Temperature Field and Thermal Deformation of Antenna Alidade

In order to solve the problem of non-uniform temperature thermal deformation caused by antenna alidade under solar radiation, environmental parameters, solar irradiation parameters and the geometric model of the alidade structure are derived, and the thermodynamic simulation of antenna alidade structure under multiply operating conditions is realized. Based on the integrated model, the temperature characteristics of antenna alidade are analyzed. 24 fiber Bragg grating temperature sensors are installed on the antenna alidade structure, and the relative accuracy of the measured temperature and the simulated temperature field is higher than 85%, which verifies the correctness of the simulation method. Combined with the geometric relationship between the shift field of the antenna structure and the data of the deviation of the antenna azimuth axis and the measured temperature characteristic data, the rapid calculation of the deformation from measured temperature to the alidade structure is realized, and the causes of the deviation of the antenna alidade shaft are analyzed.