SAC控制的RIS辅助单脉冲雷达用于多径鲁棒的生命体征定位
SAC-Controlled RIS-Assisted Monopulse Radar for Multipath-Robust Vital-Sign Localization
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中文总结 AI 辅助
本文提出一种SAC控制的RIS辅助单脉冲雷达，通过强化学习优化RIS相位配置，以减轻室内多径对生命体征定位的影响，相比传统方法提升了角度定位鲁棒性。
中文摘要 AI 辅助
非接触式雷达传感为连续生命体征监测提供了一种有前景的方法。然而，室内多径会扭曲方向估计并产生鬼影响应。本文提出了一种可重构智能表面（RIS）辅助的单脉冲雷达，其RIS相位配置由软演员-评论家（SAC）智能体控制，以改善角度定位。所提出的框架结合了同时的和差波束与可编程反射路径，使单个雷达节点能够适应传播环境，而无需依赖多个同步传感器。一个紧凑的多径模型将RIS控制表述为一个连续动作的强化学习问题，其奖励惩罚方位误差和误导性多径增强。数值结果将所提方法与无RIS的传统单脉冲处理、调频连续波距离-角度快速傅里叶变换基线、随机RIS相位配置以及确定性RIS控制器进行了比较。评估考虑了不同的目标间距、信噪比水平和多径条件。
英文摘要
Contactless radar sensing offers a promising approach to continuous vital-sign monitoring. However, indoor multipath can distort direction estimates and generate ghost responses. This paper presents a reconfigurable intelligent surface (RIS)-assisted monopulse radar whose RIS phase configuration is controlled by a soft actor-critic agent to improve angular localization. The proposed framework combines simultaneous sum and difference beams with a programmable reflected path, enabling a single radar node to adapt the propagation environment without relying on multiple synchronized sensors. A compact multipath model formulates RIS control as a continuous-action reinforcement-learning problem whose reward penalizes bearing errors and misleading multipath reinforcement. Numerical results compare the proposed method with conventional monopulse processing without an RIS, a frequency-modulated continuous-wave range-angle fast Fourier transform baseline, random RIS phase configurations, and deterministic RIS controllers. The evaluation considers different target separations, signal-to-noise ratio levels, and multipath conditions.
发表机构
- Rochester Institute of Technology（罗切斯特理工学院）
机构由 AI 辅助整理，请以论文原文为准。
