抛物面天线小形变赋形及波束重构方法

针对星载抛物面天线波束大角度重构实现方法复杂及天线在轨赋形难度大的问题,提出了一种基于馈源纵向偏焦及多参数联合优化的波束重构方法。天线的馈源阵列作纵向偏焦,采用Zernike多项式拟合抛物面并提取多项式系数作为优化变量,运用粒子群算法对多项式系数、馈源阵的幅度和相位3类参数进行联合优化。以赋形反射面算例和波束重构算例验证方法的有效性。仿真结果表明，提出的方法简单易操作,可获得较小的反射面形变量,有效降低了抛物面在轨赋形难度,并可使波束重构得以灵活实现。

Approach of micro deformation shaping and beam#br# reconfiguration for parabolic antenna

Considering that the beam reconfiguration methods are usually complex and antenna shaping is difficult on satellite, a novel beam reconfiguration method is proposed, which is based on the feed array longitudinally offset focus theory and joint optimization of multi parameter. With moving feed array of parabolic antenna some distance along the longitudinal direction, this method uses Zernike polynomial to fit the standard parabolic reflector and extracts its coefficients, combining with amplitude and phase of the feed source, which are optimized by particle swarm optimization algorithm. The validation of the proposed method is simulated by computing the antenna shaping and beam reconfiguration. The results indicate that the proposed approach can not only achieve the less deform degree which will reduce the difficulty of satellite antenna shaping, but also realize beam reconfiguration of satellite antenna easily and flexibility.