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Micro-displacement measurement is a crucial task in industrial systems such as structural health monitoring, where millimeter-level displacement of specific points on the structure or machinery displace can jeopardize the integrity of the structure and potentially leading to catastrophic damage or collapse. Traditionally, such displacements on large structures are measured using visual sensing platforms or advanced surveying equipment. However, they either fall short in varying weather and lighting conditions or require installation and maintenance of high-power sensing platforms that are expensive to deploy at scale, especially if continuous measurements are desired.

In this paper, we explore simultaneous tracking of quasi-static micro-displacements of multiple objects or multiple points from a single vantage point using millimeter-wave (mmWave) radars. We present Platypus, a micro-displacement sensing …