城市环境下智能反射面辅助雷达非视距检测

doi:10.19665/j.issn1001-2400.20241102

摘要/Abstract

摘要：

雷达非视距目标探测是城市环境下的一个重要问题,建筑物等障碍在雷达与目标之间形成遮挡导致雷达检测性能受限,传统方法是利用电磁波在墙体等介质表面的反射来实现对盲区内目标的有效探测,然而电磁波在墙体处和传播过程中的衰减限制了探测范围。可重构智能表面是一种在空域能够将电磁波反射并实现能量聚焦的平面阵列,由低功耗的电子电路控制,通过调控元件反射系数可将信号聚焦于不同位置,智能反射面凭借其低成本、易部署、低功耗的优势能够广泛应用于城市环境中。受到智能反射面调控信号能力的启发,提出利用智能反射面辅助雷达非视距探测的方法,将信号转发至目标处从而绕过遮挡,并采用交替优化算法求解反射系数,旨在提高雷达在非视距场景下的目标检测性能,拓宽雷达在城市环境下的应用。仿真实验结果表明,相比传统方法智能反射面辅助雷达非视距目标探测范围得到提升,并且智能反射面增加元件数,位置布置靠近雷达端或目标处时检测性能能够得到增强。

关键词: 非视距, 目标探测, 可重构智能表面, 交替优化

Abstract:

Radar Non-Line-of-Sight(N-LOS) target detection is a significant issue in an urban environment,where obstacles such as buildings obstruct the line of sight between the radar and the target,thereby limiting the detection performance.Traditional methods utilize the reflection of electromagnetic waves from surfaces like walls to detect targets in blind zones.However,the attenuation of electromagnetic waves at reflective surfaces and during propagation restricts the detection range.The Reconfigurable Intelligent Surface(RIS) is a planar array controlled by low-power electronic circuits,it can manipulate electromagnetic wave reflections in the spatial domain and focus energy on desired locations by adjusting the reflection coefficients of elements.The RIS,with its low cost,ease of deployment,and low energy consumption,can be widely applied in urban environments.Inspired by the signal controlling capability of the RIS,this paper proposes the use of the RIS to aid the radar NLOS detection method,forwarding signals to bypass obstacles and reach the target.Reflection coefficients are optimized employing an alternating optimization algorithm,with the aim of improving the radar's target detection performance in N-LOS scenarios and broadening radar applications in urban environments.Simulation results demonstrate that compared with traditional methods,the RIS aided radar achieves an improved N-LOS target detection range.Additionally,increasing the number of RIS elements and positioning the RIS closer to either the radar or the target further enhances the detection performance.

Key words: non-line-of-sight, target detection, reconfigurable intelligent surface, alternating optimization

中图分类号:

TN957.51

杨鹏, 周宇, 张宇佳, 张哲昊, 张世哲. 城市环境下智能反射面辅助雷达非视距检测[J]. 西安电子科技大学学报, 2025, 52(1): 130-141.

YANG Peng, ZHOU Yu, ZHANG Yujia, ZHANG Zhehao, ZHANG Shizhe. N-LOS dtection by the reconfigurable intelligent surface aided radar in an urban environment[J]. Journal of Xidian University, 2025, 52(1): 130-141.

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参数	实验值
中心频率/GHz	60
带宽/GHz	4
脉冲重复周期/μs	50
脉冲数量	256
单脉冲采样点数	1 024

参数	实验值
中心频率/GHz	8
带宽/MHz	20
脉冲重复周期/μs	20
脉冲宽度/μs	1
峰值功率/W	800
发射天线增益/dB	38
接收天线增益/dB	4