基于异步调控的时间调控超表面DOA估计方法  

DOA estimation method for time-varying metasurface based on asynchronous modulation

作　　者：易鸣[1] 陈明[1] 钟州 金梁[1] YI Ming;CHEN Ming;ZHONG Zhou;JIN Liang(Information Engineering University,Zhengzhou 450002,China)

机构地区：[1]信息工程大学,河南郑州450002

出　　处：《电信科学》2025年第1期65-74,共10页Telecommunications Science

基　　金：国家自然科学基金资助项目(No.U22A2001);自主科研项目“基于智能反射面的单通道测向定位技术研究”(No.a8709)。

摘　　要：针对现有时间维度波达方向(direction of arrival,DOA)估计方案中,时间调控速率受限导致目标信号频谱混叠的问题,提出了一种基于异步调控的DOA估计方法,该方法能够有效提升调控速率,进而提升信号处理的信号带宽。在不改变时间调控超表面(time-varying metasurface,TVM)硬件约束的情况下,该方法利用单元状态会持续一段时间的性质,交错不同列单元的变化起始时间,在一个状态持续时间内获得了多个不同的响应。异步调控方法能够使TVM在受材料限制的情况下,等效增加虚拟多通道个数,提高DOA估计的精度。仿真结果验证了方法的有效性,相较于现有的同步调控方法,新方法在DOA估计性能上有了较大提升,能够逼近理论上的最优DOA估计结果。In response to the challenge of spectral aliasing in target signals,which arose from constraints on the tem‐poral modulation rate in existing time-domain direction of arrival(DOA)estimation methods,a novel asynchronous control-based DOA estimation technique was proposed.This approach significantly increased the modulation rate,ef‐fectively mitigating the problem of spectral aliasing and consequently broadening the signal processing bandwidth.This novel approach capitalized on the inherent persistence of unit states over a duration,without necessitating any al‐terations to the hardware constraints of the time-varying metasurface(TVM).By staggering the initiation of state changes across various column units,the method enabled the acquisition of multiple distinct responses within a single state’s temporal window.The asynchronous modulation strategy effectively augmented the virtual channel count un‐der the limitations imposed by material properties,thereby enhancing the precision of DOA estimation.Empirical simulation outcomes substantiated the efficacy of this approach,demonstrating a significant enhancement in DOA es‐timation performance compared to existing synchronous modulation techniques,closely approximating the theoretical optimum for DOA estimation outcomes.

关 键 词：DOA估计 时间调控超表面 异步调控 

分 类 号：TP928[自动化与计算机技术]