Abstract
Sub-terahertz ground-penetrating radar systems offer an alternative to radio wave-based systems in the airborne imaging of buried objects. Laboratory prototype systems operating in W-band (75–110 GHz) and F-band (90–140 GHz) are presented, detecting the distance between target and source and imaging metal objects buried in mixed soil. The experimental results show that imaging in the 100–150 GHz frequency range is feasible for underground applications but significantly restricted by the attenuation characteristics of the medium covering the targets. A higher power source and more sensitive receiving components are essential to increase the penetration capability and expand the application settings of this approach.
Highlights
The SLAC National Accelerator Laboratory (SLAC) in collaboration with the UC Davis Millimeter Wave Research Center developed a technique for underground millimeter wave imaging
The technique could potentially be employed in an ultra-compact, fully integrated, remotely controlled and UAS (Unmanned Aircraft Systems)—compatible landmine and underground imaging system enabling fast, highreliability landmine image generation
After the on-soil test, 1.5 cm-thick mixed soil was put on the target plate to perform an underground imaging experiment
Summary
The SLAC National Accelerator Laboratory (SLAC) in collaboration with the UC Davis Millimeter Wave Research Center developed a technique for underground millimeter wave imaging. A portion of the outgoing beam was coupled out to the receiver, which employed a single-ended Schottky diode detector which mixed this signal with that of the time-delayed echo pulse collected by a horn
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