一种共形阵星地通信地面接收波束形成器设计  

Design of a Conformal Array Ground Receiver Beam Former for Satellite-ground Communication

作　　者：田靖才 徐达龙[1] 王昊[1] TIAN Jingcai;XU Dalong;WANG Hao(Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学,江苏南京210094

出　　处：《无线电工程》2021年第1期49-57,共9页Radio Engineering

基　　金：国家自然科学基金资助(61701240);装备预研领域基金(61402091603)。

摘　　要：为了满足卫星和地面实现通信的需求,设计了一种共形阵的星地通信面接收波束形成器。采用球面阵圆极化天线的形式,在FPGA平台上完成信号处理。系统可以完成对信号的接收、下变频和数字波束形成等功能。系统内置整套卫星定位和数字波束形成算法,可根据上位机给出的星历平根数据,自主完成实时计算卫星位置、波束指向角度和权系数,可同时完成6个波束的形成。实现了方位范围全覆盖,俯仰覆盖75°范围的空间大范围波束扫描。天线拥有左旋右旋双通道,可以根据发射信号的极化方式选择其中一种通道进行数字波束形成,增强了抗干扰性能。实验结果表明,接收站性能良好,在暗场测试环境下,理论性能最差的角度上的G/T值可达到-13.2 dB/K,可满足星地通信的需求。To meet the requirement of satellite-ground communication,a conformal array ground receiver beam former is designed using a spherical array circularly polarized antenna,and signal processing is completed on FPGA.The system has the functions of signal reception,down conversion and digital beam forming.With a set of built-in satellite positioning and digital beam forming algorithms,it can independently calculate the satellite position,beam pointing angle and weight coefficient according to the ephemeris flat root data given by the host computer,and 6 beams can be formed simultaneously.The system realizes a wide range of beam scanning with full coverage in azimuth range,and 75°coverage in elevation range.The antenna has dual channels of left-hand and right-hand,one of which can be selected for digital beam forming according to the polarization mode of the transmitted signal,which enhances the anti-interference performance.The experimental results show that the receiving station has good performance,and the G/T value can reach-13.2dB/K,which meets the requirement of satellite-ground communication.

关 键 词：共形阵 FPGA 数字波束形成 星地通信 阵列信号处理 

分 类 号：TN91[电子电信—通信与信息系统]