Improving SNR for NLoS Target Detection Using Multi-RIS-Assisted Monostatic Radar

IF 5.3 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Salman Liaquat;Ijaz Haider Naqvi;Faran Awais Butt;Saleh Alawsh;Nor Muzlifah Mahyuddin;Ali Hussein Muqaibel
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引用次数: 0

Abstract

The use of a reconfigurable intelligent surface (RIS) in radar systems significantly enhances target detection, particularly in challenging non-line-of-sight (NLoS) scenarios. In urban environments, where structures frequently obstruct line-of-sight (LoS) paths, the integration of RISs with existing radars can offer a viable solution for enhancing signal-to-noise ratio (SNR) and improving target detection. Approaches utilizing a single RIS can still fail in scenarios where a link cannot be established. This paper presents a novel approach for deriving a comprehensive expression for the received power, SNR and path loss (PL) in systems where multiple RISs assist a monostatic radar. We analyze the power received in dual RIS configurations and extend this to include additional RISs, demonstrating how each additional RIS placement affects the system's performance. Moreover, the analysis explores the impact of different Swerling target models on the SNR and PL, highlighting the optimal angles for target detection. This multi-RIS strategy offers a substantial performance boost over conventional radars and single RIS-assisted systems, particularly in environments with obstacles. Simulation results demonstrate a significant improvement in SNR with a dual RIS-assisted radar, with up to 14.42 dB gains observed when employing a $46 \times 46$ element RIS configuration at L-band and 65.47 dB gain when employing a $328 \times 328$ element RIS configuration at X-band, corresponding to a RIS size of $ 5\text{ m} \times 5\text{ m}$ at both frequencies, showing the efficacy of the proposed multi-RIS strategy.
利用多 RIS 辅助单静态雷达提高 NLoS 目标探测的信噪比
在雷达系统中使用可重构智能表面(RIS)可显著增强目标探测,特别是在具有挑战性的非视距(NLoS)场景中。在城市环境中,建筑物经常阻碍视线(LoS)路径,将RISs与现有雷达集成可以为提高信噪比(SNR)和改进目标检测提供可行的解决方案。在无法建立链接的情况下,使用单个RIS的方法仍然可能失败。本文提出了一种新的方法,用于在多个RISs辅助单站雷达的系统中推导接收功率,信噪比和路径损耗(PL)的综合表达式。我们分析了双RIS配置中接收的功率,并将其扩展到包括额外的RIS,演示了每个额外的RIS放置如何影响系统的性能。此外,分析了不同的转向目标模型对信噪比和PL的影响,突出了目标检测的最佳角度。与传统雷达和单一ris辅助系统相比,这种多ris策略提供了显著的性能提升,特别是在有障碍物的环境中。仿真结果表明,双RIS辅助雷达的信噪比显著提高,在l波段采用$46 × 46元的RIS配置时,增益高达14.42 dB,在x波段采用$328 × 328元的RIS配置时,增益为65.47 dB,对应于两个频率的RIS大小为$ 5\text{m} × 5\text{m}$,显示了所提出的多RIS策略的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
9.60
自引率
0.00%
发文量
25
审稿时长
10 weeks
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