一种基于多波束天线增益差的单GEO卫星干扰源定位方法

A Single GEO Satellite Interference Source Location MethodBased on Multi-beam Antenna Gain Difference

卫星通信中单颗同步轨道(GEO)卫星受干扰后对干扰源很难定位。针对GEO卫星,提出了一种基于多波束天线的单颗卫星干扰源定位方法。介绍了单星多波束天线干扰源定位原理,分析了边缘波束受干扰情况下,邻波束的可用性,重点分析了增益测量误差、波束指向误差和海拔对定位精度的影响。从仿真结果可以得出,增益测量误差是导致定位误差的重要因素。波束指向存在0.01°误差时,最终的定位误差一般在几千米到十几千米。干扰源未知海拔高引入的误差相对增益测量差一般在500 m以下。当干扰源偏离星下点的时候,无论是增益误差还是波束指向误差对定位误差的影响都会偏大。

A single GEO satellite used in satellite communications is difficult to locate the source of interference after being interfered.Aiming at GEO satellites,this paper proposes a single-satellite interference source location method based on multi-beam antenna gain difference measurement.This paper firstly introduces the principle of single-satellite multi-beam antenna interference source location;then analyzes the availability of adjacent beams when the edge beam is interfered;finally,focuses on analyzing the influence of gain measurement error,beam pointing error and altitude on the location accuracy.From simulation results,it can be concluded that the gain measurement error is an important factor leading to the positioning error.When there is an error of 0.01°in beam pointing,the final positioning error is generally between a few kilometers and a dozen kilometers.The error relative gain measurement difference introduced by the unknown altitude of the interference source is generally less than 500 m.When the interference source deviates from the sub-satellite point,both gain error and beam pointing error will have a larger influence on positioning error.Simulation in this paper also proves that the positioning error will be larger by introducing weak signal beams far away from the interference source.