中国天眼馈源舱接收比的优化控制

Optimal control of acceptance ratio for feed cabin of China's Eye of Heaven

建立了中国天眼——500米口径球面射电望远镜(FAST)馈源舱接收比优化控制的数学模型,得到天眼系统反射面的理想抛物面方程,并基于遗传算法给出天眼系统主索节点的调节方案,为天眼系统工作抛物面的构建提供了一个重要参考。数值仿真表明,在被观测天体方位角为36.795°,仰角为78.169°时,馈源舱接收比为61.43%,高出基准球面的馈源舱接收比约55.97个百分点,优化效果明显。

A mathematical model was established to optimize the acceptance ratio of the feed cabin of China's Eye of Heaven,the Five-hundred-meter Aperture Spherical Telescope(FAST),and the ideal parabolic equation of the reflector of FAST system was obtained.The adjustment scheme of the main cable node of the system was given based on the genetic algorithm.The numerical simulation shows that the reception ratio of the feed cabin is 61.43%when the observed celestial body's azimuth is 36.795°and elevation is 78.169°.The acceptance ratio of the feed cabin is about 55.97 percentage points higher than the base sphere.