NASA NTRS · 19770000045
Subsurface "radar" camera
Abstract
Long-wave length multiple-frequency radar is used for imaging and determining depth of subsurface stratified layers. Very-low frequency radar signals pinpoint below-ground strata via direct imagery techniques. Variation of frequency and scanning angle adjusts image depth and width.
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Jain, A.. 1977-06-01. Subsurface "radar" camera. https://ntrs.nasa.gov/citations/19770000045
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