数字真延时宽带波束形成原理的硬件演示和验证  

Demonstration and verification of wideband beamforming using digital true time delay on hardware

作　　者：郭明 张书瑞 Guo Ming;Zhang Shurui(CETC No.38 Research Institute,Hefei 230088,Anhui,China;Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)

机构地区：[1]中国电子科技集团公司第38研究所,安徽合肥230088 [2]南京理工大学,江苏南京210094

出　　处：《航天电子对抗》2020年第3期41-45,共5页Aerospace Electronic Warfare

摘　　要：随着带宽需求的增加,使用移相器的数字波束形成技术会出现波束指向偏差等问题,而基于数字真延时的宽带波束形成,可以很好地解决这个问题。为了验证基于数字真延时的宽带波束形成,首先介绍了Farrow滤波器,用此滤波器实现数字真延时,并引入均衡器来补偿通道间特性的不一致;其次给出了Farrow滤波器和均衡器的FPGA设计,构建了数字真延时宽带波束形成验证系统;最后按照实验步骤,得到均衡效果和波束形成结果,验证了基于数字真延时的宽带波束形成能够实现准确的指向,方向图性能优越。为数字真延时宽带波束形成的应用提供了理论和技术支持。With the increase demand for bandwidth,because the deviation of beam pointing will occur,digi⁃tal beamforming(DBF)technology with phase shifters can not satisfy the requirements.However,wideband digital beamforming(WDBF)based on digital true time delay(TTD)can solve this problem well.Aiming to verify WDBF using digital TTD on hardware,the Farrow filter is introduced firstly,that is used for digital TTD,and an equalizer is introduced to compensate for inconsistencies between channels.Secondly,the FPGA design of the Farrow filter and the equalizer is given,and a verification system with WDBF based on digital TTD is constructed.Finally,the equalization effect and beamforming results are got following the experimental steps.It is verified that WDBF based on digital TTD can realize accurate pointing and superior performance of the pattern.It provided that theoretical and technical support for the application of WDBF based on digital TTD.

关 键 词：宽带数字波束形成 数字真延时 Farrow滤波器 通道均衡 

分 类 号：TN958[电子电信—信号与信息处理]