卫星星体对多波束天线的散射影响分析  

Analysis of Scattering Effect of the Satellite Body on the Multi-beam Antenna

作　　者：肖永轩[1] 曹桂兴[1] 曾小金[1] 薛永[1] 

机构地区：[1]中国空间技术研究院,北京100094

出　　处：《航天器工程》2011年第3期93-97,共5页Spacecraft Engineering

基　　金：国家"863"项目"基于3G及其兼容技术的GEO卫星移动通信系统总体技术研究"课题资助;项目编号为2008AA011102

摘　　要：地球静止轨道(GEO)移动通信卫星,多采用大反射面天线及多馈源组成的空间可展开多波束天线系统,具有更高的天线增益,并提高了整体系统性能,但由于过于庞大的天线反射面和馈源阵列,在整星结构构型布局中难免由于卫星星体或其它机构部件的存在而造成散射。文章主要针对GEO移动通信卫星星体对多波束天线散射影响问题,利用仿真分析软件,计算了无卫星星体情况下的合成波束覆盖区图,以及有卫星星体散射情况下的合成波束覆盖区图,并将两者计算结果进行对比,分析结果显示,由于卫星星体的散射影响,使得合成波束主极化和交叉极化覆盖增益分别变化了0.1dB和0.2dB,卫星星体存在对多波束天线的散射影响,因此应分析卫星构型布局对电磁波传播的影响,避免出现颠覆性问题。On the geostationary Earth orbit（GEO） mobile communications satellite,the deployable multi-beam antenna system with large scale reflector and multi-feed is often adopted,which has higher antenna gain and system performance.At the same time,due to the huge reflector and feed array,the scattering effect probably exists,which comes from the satellite body and other structure in the satellite layout.This paper focuses on the multi-beam antenna scattering effect of the satellite body on the GEO mobile communications satellite.With the help of software,the contours of the satellite composite multi-beam antenna excluding and including the satellite body were calculated,respectively.The comparison shows that,due to the scattering effect of the satellite body,the co-polarization and cross polarization of the composite multi-beam 3dB gain coverage is changed 0.1dB and 0.2dB,respectively.Consequently,the scattering effect of the satellite body can affect the multi-beam antenna.And an analysis of the effect of the satellite layout on electromagnetic wave transmission is needed to avoid repudiation problems.

关 键 词：地球静止轨道 移动通信卫星 多波束天线 散射 物理光学法 物理绕射理论 仿真分析软件 

分 类 号：V443.4[航空宇航科学与技术—飞行器设计]