面向灵巧通信卫星应用的数字多波束成形研究
Research on Digital Beamforming Technology in Satellite Communication
路一凡 1黄文乾 2尧如歌 1李殷乔 2邓长江1
作者信息
- 1. 北京理工大学集成电路与电子学院,北京 100081
- 2. 中国空间技术研究院通信与导航卫星总体部,北京 100094
- 折叠
摘要
围绕灵巧卫星数字多波束相控阵的工程应用,针对通信卫星采用的多波束频分多址通信体制,讨论了基于多相快速傅里叶变换(Fast Fourier Transform,FFT)的数字信道化技术和基于二维 FFT的数字波束成形原理,设计了一个 20 MHz带宽的阵列接收模型,将接收到的不同用户的不同频率信号通过对应的子信道输出,从而实现对多路同时到达信号的实时截获、降速以及变频,并成功集成到一个 2×2 阵列的数字波束成形(Digital Beamforming,DBF)多波束模块中,达到了时域和空域的双重滤波效果.进一步通过Matlab、SysGen和现场可编程门阵列(Field-Programmable Gate Array,FPGA)多平台联合仿真,验证模型的准确性和有效性.仿真结果表明,在15 dB信噪比的前提下,生成的波束能够完全覆盖用户终端所在的整个区域,确保了通信的全面覆盖,且传输误码率为0.
Abstract
Focusing on the engineering application of agile satellite digital multi-beam phased arrays,the discussion centers on dig-ital channelization technology based on multi-phase Fast Fourier Transform(FFT)and digital beamforming principles based on two-di-mensional FFT,specifically addressing the multi-beam frequency division multiple access communication system used in communication satellites.A 20 MHz bandwidth array receiver model was designed to process signals from different users by routing them through corre-sponding sub-channels,thereby enabling real-time interception,deceleration,and frequency conversion of multiple simultaneously arriving signals.This model was successfully integrated into a 2×2 array Digital Beamforming(DBF)multi-beam module,achieving du-al-domain filtering effects in both the time and spatial domains.Further validation through Matlab,SysGen,and Field-Programmable Gate Array(FPGA)multi-platform simulations confirmed the accuracy and effectiveness of the model.Simulation results show that un-der the condition of a 15 dB signal-to-noise ratio,the generated beam can fully cover the entire area where the user terminals are loca-ted,ensuring comprehensive communication coverage,and the transmission bit error rate is zero.
关键词
数字信道化/数字波束成形/相控阵/快速傅里叶变换Key words
digital channelization/DBF/phased array/FFT引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据