The ubiquity of millimeter-wave (mmWave) technology could bring through-obstruction imaging to portable, mobile systems. Existing through-obstruction imaging systems rely on Synthetic Aperture Radar (SAR) technique, but emulating the SAR principle on handheld devices has been challenging. We propose ViSAR, a portable platform that integrates an optical camera and mmWave radar to emulate the SAR principle and enable through-obstruction 3D imaging. ViSAR synchronizes the devices at the software-level and uses the Time Domain Backprojection algorithm to generate visionaugmented mmWave images. We have experimentally evaluated ViSAR by imaging several indoor objects. CCS CONCEPTS• Human-centered computing → Ubiquitous and mobile computing systems and tools; • Hardware → Sensor devices and platforms.

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Millimeter-wave (mmWave) imaging has been difficult to implement on handheld devices since imaging algorithms rely on millimeterscale device self-tracking, which existing systems cannot achieve reliably. We propose CompenSAR, a handheld system which integrates a mmWave transceiver and a tracking camera, and overcomes the self-tracking limitations to enable handheld mmWave imaging. CCS CONCEPTS• Hardware → Sensor devices and platforms; • Human-centered computing → Ubiquitous and mobile computing systems and tools.