Abstract
Indoor device-free object sensing can be applied to many applications such as occupant monitoring and assisted living. Radio-frequency identification (RFID) offers a low-cost solution with a plethora of passive tags as spatially dispersed observation units. Both the received signal strength indicator and carrier phase from tag backscattering are assembled to generate the voxel reflectivity distribution by the inverse method. The regularized truncated pseudo-inverse solution has lower computational cost and higher locating accuracy than the conventional matched filtering. An experimental prototype with different placement of tags and reader antennas was constructed to evaluate the system robustness and performance.
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