Abstract: An interference orientation method based on on-board multi-beam antenna is proposed for the GEO satellites. In this method, a mapping relationship between direction of interference and antenna gain is first established with the function of antenna pattern. After that, it establishes the equations about link calculation of interference signal with the mapping relationship, the information of beam direction and the intensity distribution of interference in multi-beams environment. And then the orientation of interference is obtained by solving the equations with the help of Particle Swarm Optimization（PSO）, comparing with the Maximum Likelihood. It has simulated the performance of the ground interference with the proposed method. The results show that this method is effective in determining the orientation of interference.

Key words: interference orientation, Particle Swarm Optimization（PSO）, multi-beam antenna, antenna pattern

摘要： 针对地球同步轨道通信卫星，提出了一种基于星载多波束天线的单星干扰源定向方法。该方法通过天线方向图函数建立干扰源的位置指向与天线增益的映射关系，结合波束中心指向信息和干扰信号在多波束环境下的强度分布，建立干扰信号链路计算的方程组，利用粒子群算法对其进行求解，并与基于二层搜索的最大似然算法进行比较。采用上述干扰源定向方法对地面干扰源进行了定向仿真，结果表明了该方法的有效性。

关键词: 干扰源定向, 粒子群算法, 多波束, 方向图