一种考虑反向缝的全球低轨卫星通信系统的波束排布方法

针对全球低轨卫星通信系统的动态性引起的反向缝区域覆盖问题，采用辐射场到地球覆盖区的转换方法，仿真分析了单个卫星服务区为圆形、椭圆和矩形时的全球覆盖情况，并采用椭圆子波束排布对椭圆和矩形的卫星覆盖进行了分析。结果表明，在不增加波束个数的前提下，采用波导缝隙阵的长椭圆子波束，单个卫星矩形覆盖可以有效解决卫星反向缝区域无法完全覆盖的问题。通过对多星影响下的载干比统计方法进行分析，得出这种卫星波束排布方法满足卫星通信的要求，为低轨卫星的天线波束设计提供了理论参考。

An antenna beam scheme considering cross seam for global LEO satellite communication system

Focusing on the regional coverage problem of the cross seam due to the dynamics of global low earth orbit(LEO) satellite system,the transform method from radiation field to the global coverage is proposed to simulate the satellite coverage.The simulation is performed under cases of circular coverage,elliptical coverage and rectangular coverage,and the elliptical sub-beam arrangement is adopted to analyze the elliptical and rectangular satellite coverage.The results show that,without increasing the beam numbers,rectangular satellite coverage using the flat elliptical sub-beams of slotted waveguide array is a good solution for the incomplete coverage problem of the cross seam.Considering the multiple satellites effect,the analytical results of the carrier to interference ratio statistical method indicate that the proposed beam scheme can satisfy the satellite communication requirement,and this work provides theoretical reference for beam design of LEO satellite antenna.