Millimeter-Wave Bat for Mapping and Quantifying Micromotions in Full Field of View
Principle and implementation of the mmWBat. (a) Series of multiple chirps (i.e., sweeps) and data flow. The multichannel baseband signals can be arranged and represented to be a three-dimensional matrix. For per channel, fast time corresponds to the sampling baseband signal of each chirp and slow time corresponds to multiple chirps along time. : sweep period; : transmitted bandwidth. (b) Schematic of multitarget imaging heat map of the mmWBat. Different colors represent different signal strengths. (c) Flow chart of quantifying micromotions of full-field targets. (d) Schematic of micromotion displacement extraction across multiple sweeps in range-angle joint dimension (one target is shown as an example). dim-1: range-dimension; dim-2: angle-dimension.