一种适用于快跳频系统的空域抗干扰算法实现  

Implementation of A Spatial Anti-Interference Algorithm Suitable for Fast Frequency-Hopping Systems

作　　者：赵吉喆 王昊[1] 张炜[1] ZHAO Jizhe;WANG Hao;ZHANG Wei(National University of Defense Technology,Changsha 410003,China)

机构地区：[1]中国人民解放军国防科技大学,长沙410003

出　　处：《遥测遥控》2025年第1期81-89,共9页Journal of Telemetry,Tracking and Command

基　　金：国家自然科学基金面上项目:基于可重构智能表面的安全高谱效通信技术研究(62171445)。

摘　　要：针对调频系统中频率变化快、信号环境高度动态化等挑战,本文提出了一种适用于FPGA(现场可编程门阵列)实现的改进型对角加载SMI(采样矩阵求逆)算法,以增强系统在复杂环境下的抗干扰能力。改进型对角加载SMI算法相较于传统的SMI算法,能够更有效地应对低快拍数和复杂干扰环境下的信号处理需求,且对角加载因子的计算复杂度较低。本文简要介绍了改进型对角加载SMI算法的基本原理以及对角加载因子的计算方法,详细阐述了其在FPGA实现上的改进和性能分析。首先,利用高层综合(Vivado HLS)技术完成了低复杂度的对角加载因子的估计,实现了最优权矢量计算并简化了设计流程。随后,将HLS生成的IP核打包并集成至工程中实现波束合成。仿真结果表明:对角加载SMI算法在FPGA平台上可以达到70 dB以上的信干比改善,表现出显著的干扰抑制效果算法还可在4734个时钟周期内完成抗干扰权值计算与波束合成更新,速度快,能够满足10000跳每秒以上跳频信号抗干扰的实时处理需求。To address challenges such as fast frequency changes and highly dynamic signal environments in frequency-hopping systems,this paper proposes an improved diagonally loaded SMI(Sample Matrix Inversion)algorithm suitable for FPGA(Field-Programmable Gate Array)implementation to enhance the system's anti-interference capability in complex environments.Compared with the traditional SMI algorithm,the improved diagonally loaded SMI algorithm is more effective in handling signal processing demands under low snapshot numbers and complex interference environments,with a lower computational complexity for the diago‐nal loading factor.This paper briefly introduces the basic principles of the improved diagonally loaded SMI algorithm and the calcu‐lation method of the diagonal loading factor,while providing a detailed explanation of its FPGA implementation and performance analysis.Firstly,low-complexity estimation of the diagonal loading factor is achieved using high-level synthesis(Vivado HLS)technology,enabling the optimal weight vector calculation and simplifying the design process.Subsequently,the IP core generated by HLS is packaged and integrated into the project to implement beamforming.Simulation results show that the diagonally loaded SMI algorithm can achieve an interference-to-signal ratio(SIR)improvement of over 70 dB on the FPGA platform,demonstrating significant interference suppression effects.Additionally,the algorithm completes anti-interference weight calculation,and beam‐forming update within 4734 clock cycles,ensuring fast performance and meeting the real-time processing requirements for frequency-hopping signals with over 10000 hops per second.

关 键 词：空域抗干扰算法 对角加载 跳频系统 

分 类 号：TN975[电子电信—信号与信息处理]