This paper presents RadAround, a passive 2-D direction-finding system designed for adversarial IoT sensing in contested environments. Using mechanically steered narrow-beam antennas and field-deployable SCADA software, it generates high-resolution electromagnetic (EM) heatmaps using low-cost COTS or 3D-printed components. The microcontroller-deployable SCADA coordinates antenna positioning and SDR sampling in real time for resilient, on-site operation. Its modular design enables rapid adaptation for applications such as EMC testing in disaster-response deployments, battlefield spectrum monitoring, electronic intrusion detection, and tactical EM situational awareness (EMSA). Experiments show RadAround detecting computing machinery through walls, assessing utilization, and pinpointing EM interference (EMI) leakage sources from Faraday enclosures.
翻译：本文介绍RadAround，一种专为对抗性物联网感知在对抗环境中设计的被动二维定向系统。该系统利用机械转向的窄波束天线和可现场部署的SCADA软件，采用低成本商用现货或3D打印组件生成高分辨率电磁热图。可部署于微控制器的SCADA实时协调天线定位与软件定义无线电采样，以实现稳健的现场操作。其模块化设计支持快速适配多种应用，如灾难响应部署中的电磁兼容性测试、战场频谱监测、电子入侵检测以及战术电磁态势感知。实验表明，RadAround能够穿透墙壁检测计算设备、评估其利用率，并精确定位法拉第屏蔽罩的电磁干扰泄漏源。
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