Target Detection and Positioning Aided by Reconfigurable Surfaces: Reflective or Holographic?

被引:20
作者
Zhang, Xiaoyu [1 ]
Zhang, Haobo [2 ]
Liu, Liang [3 ]
Han, Zhu [4 ,5 ]
Poor, H. Vincent [6 ]
Di, Boya [1 ]
机构
[1] Peking Univ, Sch Elect, Beijing 100871, Peoples R China
[2] Peking Univ, Shenzhen Grad Sch, Sch Elect & Comp Engn, Shenzhen 518055, Peoples R China
[3] Hong Kong Polytech Univ, Dept Elect & Informat Engn, Hong Kong, Peoples R China
[4] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77004 USA
[5] Kyung Hee Univ, Dept Comp Sci & Engn, Seoul 446701, South Korea
[6] Princeton Univ, Dept Elect & Comp Engn, Princeton, NJ 08544 USA
基金
美国国家科学基金会; 北京市自然科学基金; 日本科学技术振兴机构;
关键词
Radar; Metasurfaces; Radar antennas; Object detection; Accuracy; Sensors; Radar detection; Radar imaging; Reconfigurable intelligent surfaces; Antennas; Target detection; positioning; reconfigurable holographic surface; reconfigurable intelligent surface; radar signal-to-noise ratio; WIRELESS COMMUNICATIONS; RADAR;
D O I
10.1109/TWC.2024.3480353
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Reconfigurable metasurfaces integrating numerous elements are one promising solution for empowering high-accuracy positioning applications, benefiting from their high spatial resolution, low power consumption, and low cost. In this paper, we investigate two typical types of metasurfaces, i.e., reconfigurable holographic surfaces (RHSs) and reconfigurable intelligent surfaces (RISs), for target detection and positioning. Specifically, an RHS is a leaky-wave surface antenna with an embedded feed, while an RIS is a type of reflective metasurface whose feed is positioned outside the surface. Due to their distinct structures and working principles, RHSs and RISs may be suitable for different scenarios for target detection and positioning. To determine their best working scenarios, we first design the beamformers of both RIS-enabled and RHS-enabled radar systems to improve their performance. We then characterize the target detection and positioning performance analytically, and finally compare their performance in different scenarios. Theoretical and numerical results both reveal that: 1) in the one-dimensional linear array case, in general the performance of the RHS-enabled system is better than that of the RIS-enabled system; 2) in the two-dimensional planar array case, lower frequencies and larger physical sizes can contribute to a better performance of RIS-enabled systems than RHS-enabled systems, and vice versa.
引用
收藏
页码:19215 / 19230
页数:16
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