Coupled Analysis Of Large Reflector Antenna Based On Solar Radiation Effects And Its Compensation

In recent years, as one of important equipment, large reflector antenna plays a crucial role in many fields, such as deep space exploration, radar communication, radio astronomy. With the increasing of aperture and frequency range, the effects of solar radiation on the large reflector antenna are more and more remarkable, in which coupled electromechanical problem is particularly acute. Thus, the design and compensation of antennas become more and more challenging. Therefore, in this paper, the coupled multi-field analysis of large reflector antenna based on solar radiation effects and its compensation are analyzed and studied. The main works are as follows:1. According to the impact of solar radiation on large reflector antennas, on the basis of the movement of celestial bodies and geographic information, a calculation method of the solar incidence angle for large reflector antennas is proposed. The results show that, based on the information of geographic, time and the antenna’s attitude, the available curves of solar incidence angle on large antenna in one day could be known by this method, and the real-time results of the solar incidence angle in the daytime can be obtained.Analysis method2. Based on the calculation method of SIA, an improved analysis method of the coupled multi-field problems of large reflector antennas is proposed, by which the mapping problems between the different complex models and transmitting problems about their related data become more simple and convenient. Meanwhile, the calculation of coupled multi-field problems of large or even huge reflector antennas becomes easier, and the computational efficiency can be improved. Therefore, the analysis of the solar radiation, thermal deformation and electrical performance for large reflector antennas become faster and more accurate. By analyzing the temperature cloud maps, the deformation cloud maps, the antenna pattern and the curves of temperature, displacement and electrical properties, the effect laws of different solar thermal radiation in different solar incidence angles for large reflector antenna can be obtained.3. By analyzing the thermal radiation problem on reflector antenna under different solar incidence angles, a fast calculation method of the temperature field of large reflector antennas based on the SIA is put forward. Combined with the coupled multi-field theory of large reflector antennas, the solar radiation effect coupling analysis software for large antenna based on C++ Builder is developed, by which the process of the coupled structural-mechanical-electromagnetic analysis can be simplified, and the analysis efficiency can be improved.4. Based on the coupled electromechanical theory and the technique of active surface compensation, a calculation method of the active panel compensation for main reflector of large antennas is proposed. According to the main surface deformation caused by the solar radiation, main surface distortion and the compensation feed value to the actuators can be get. Secondly, an electromechanical coupling model of active surface compensation to the distorted shaped antenna is established, and a method of testing its effect is also proposed. By comparing to the electromagnetic analysis results in FEKO, the accuracy and effectiveness of the coupling model are verified. The simulation results also show that, after applying the compensation value get in this paper to the deformed reflector antenna, the precision of the main reflector can be effectively enhanced. For this, the side-lobe of the antenna is reduced, the pointing accuracy is also became better, the electrical properties of the antenna are effectively improved.