基于频谱交叉项的多路数字信号合成方法  

Multi-channel Digital Signal Synthesis Method Based on Spectrum Cross-terms

作　　者：郭晓彤[1] 李文臣 杨东升[1] 方子维 王薇 高飞 GUO Xiao-tong;LI Wen-chen;YANG Dong-sheng;FANG Zi-wei;WANG Wei;GAO Fei(China Research Institute of Radiowave Propagation,Qindao 266107,China;School of Computer,Xijing University,Xi’an 710123,China)

机构地区：[1]中国电波传播研究所青岛分所,山东青岛266071 [2]西京学院计算机学院,陕西西安710123

出　　处：《中国电子科学研究院学报》2025年第1期19-24,共6页Journal of China Academy of Electronics and Information Technology

摘　　要：在电子战和通信领域,模拟复杂电磁环境的关键环节是合成多路数字信号,这一过程对信号的中心频率和采样率有着严格的要求。现有技术在处理这些要求时遇到了显著的局限性。针对数字信号任意变采样率和多路数字信号合成技术难题,本文提出了基于频谱交叉项的多路数字信号合成方法。通过数字信号频谱交叉项合成和时频域相互变换,直接在数字域实现了不同中心频率和采样率的通道间相互转换,以及多路数字信号合成。与传统方法相比,本方法具有更高的灵活性和合成效率,能够处理跨频带或欠采样信号,满足任意中心频率和带宽的多路信号合成需求。仿真验证结果表明,本方法优于直接数字合成方法,可以应用到电子战数字视频仿真和基于矢量信号源的射频信号产生中。In the fields of electronic warfare and communication,a key aspect of simulating complex electromagnetic environments is the synthesis of multi-channel digital signals,a process that has stringent requirements for the signals’center frequencies and sampling rates.Existing technologies encounter significant limitations when addressing these requirements.Aiming at the technical problems of arbitrary variable sampling rate of digital signal and multi-channel digital signal synthesis,a multi-channel digital signal synthesis method based on spectrum cross term is proposed.Through digital signal spectrum cross term synthesis and time-frequency domain mutual transformation,the mutual conversion between channels with different center frequencies and sampling rates and multi-channel digital signal synthesis are realized directly in the digital domain.Compared to traditional methods,this approach offers greater flexibility and synthesis efficiency,capable of handling signals that span frequency bands or are under-sampled,meeting the requirements for multi-channel signal synthesis with arbitrary center frequencies and bandwidths.Simulation verification results demonstrate the superiority of this method over direct digital synthesis methods,and it can be applied to EW digital video simulation and RF signal generation based on vector signal source.

关 键 词：多路信号 数字变采样 频谱交叉项 数字信号合成 傅里叶变换 

分 类 号：TN911.72[电子电信—通信与信息系统]