In this contribution, a portable freehand millimeter-wave imaging system based on a commercial highly integrated radar-on-chip is presented. The portable imager, whose position is tracked during its operation, is moved by hand over the inspected area, enabling versatile screening capabilities with a compact device. The movement of the scanner is leveraged to create a synthetic aperture, resulting on an increased lateral resolution of the system, which comprises up to 400 independent radiofrequency channels. The performance of the proposed freehand imaging system, which is capable of providing high-resolution images at a fast acquisition rate, is illustrated through measurements of different targets.
In this contribution, the performance of a Ground Penetrating Radar (GPR) system mounted on board an Unmanned Aerial Vehicle (UAV) to detect buried landmines and Improvised Explosive Devices (IEDs) is analyzed. Radar measurements are coherently combined using a Synthetic Aperture Radar (SAR) algorithm complemented with several clutter mitigation techniques. As a result, 3D high-resolution radar images of the subsurface with enhanced signal-to-clutter-ratio are retrieved. Several prototypes and different GPR architectures have been extensively tested in realistic scenarios, where numerous metallic and non-metallic targets (landmines and IEDs) have been buried under different conditions (dry and wet fields, dirt roads, sloped terrains).
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