PoM: RFID Positioning for Real-World Application Using the Power of Mobility

In many scenarios, we need to identify an object and then locate it within high precision (centimeter or millimeter level). RFIDs have played a significant role in this field. While many state-of-the-art systems have shown good performance, they require expensive hardware or extra time. Based on a previous work, GLAC, we present PoM, a 3D localization system within millimeter-level precision using only COTS RFID devices. Inspired by the same idea, PoM also draws power from mobility, and makes two key technical improvements. First, to the best of our knowledge, PoM is the first localization system that simultaneously adopts Synthetic Aperture Radar (SAR) and Inverse Synthetic Aperture Radar (ISAR) method. In particular, we employ antenna motion to construct SAR and tag's mobility to construct ISAR. Second, we take actual application scenarios into consideration and apply an extra mechanism so that PoM can gain better performance in special situations. Our simulation experiments show that, in high-speed scenarios and other challenging real-world applications, PoM achieves better performance than the original GLAC system.