标题： 双RIS辅助的非视距场景下单站L波段雷达目标检测 显示英文标题

标题： Dual RIS-Assisted Monostatic L-Band Radar Target Detection in NLoS Scenarios

摘要： 使用单个可重构智能表面（RIS）来增强雷达处的信噪比（SNR），在检测目标方面提供了显著的改进，特别是在非视距（NLoS）场景中。 然而，在某些情况下，即使使用单个RIS辅助的雷达，由于其他存在的障碍物，雷达和目标之间也可能不存在路径。 本文推导了在双RIS辅助的单基地雷达在NLoS情况下目标检测场景中的SNR表达式。 我们通过双RIS配置计算雷达接收到的功率。 我们表明，当已知雷达和RIS的位置时，RIS辅助雷达的SNR性能可以得到改善。 我们的结果表明，通过控制RIS的数量、每个RIS中的单元数量，并适当选择RIS的位置以覆盖所需区域，可以实现所需的定位精度。 在有利对齐和足够大的RIS尺寸下，双RIS辅助雷达系统的性能可以超过单RIS辅助雷达系统的性能。 显示英文摘要

摘要： The use of a single Reconfigurable Intelligent Surface (RIS) to boost the signal-to-noise ratio (SNR) at the radar offers significant improvement in detecting targets, especially in non-line-of-sight (NLoS) scenarios. However, there are scenarios where no path exists between the radar and the target, even with a single RIS-assisted radar, due to other present obstacles. This paper derives an expression for SNR in target detection scenarios where dual RISs assist a monostatic radar in NLoS situations. We calculate the power received at the radar through a dual RIS configuration. We show that the SNR performance of RIS-assisted radars can improve with known locations of the radar and RISs. Our results demonstrate that the required accuracy in target localization can be achieved by controlling the number of RISs, the number of unit cells in each RIS, and properly selecting the locations of RISs to cover the desired region. The performance of dual RIS-assisted radar systems can surpass that of single RIS-assisted radar systems under favourable alignment and sufficiently large RIS sizes.