Open AccessDigital passband processing of wideband-modulated optical signals for enhanced underwater imaging
Author(s) -
Linda Mullen,
Robert Lee,
J. K. Nash
Publication year - 2016
Publication title -
applied optics
Language(s) - English
Resource type - Journals
ISSN - 0003-6935
DOI - 10.1364/ao.55.000c18
Subject(s) - underwater , demodulation , passband , computer science , optics , modulation (music) , signal processing , visibility , wideband , image processing , computer vision , artificial intelligence , radar , remote sensing , telecommunications , acoustics , band pass filter , physics , geology , channel (broadcasting) , image (mathematics) , oceanography
Radar modulation, demodulation, and signal processing techniques have been merged with laser imaging to enhance visibility in murky underwater environments. The modulation provides a way to reject multiple scattered light that would otherwise reduce image contrast and resolution. Recent work has focused on the use of wideband modulation schemes and digital passband processing to resolve range details of an underwater scene. Use of the CLEAN algorithm has also been investigated to extract object features that are obscured by scattered light. Results from controlled laboratory experiments show an improvement in the range resolution and accuracy of underwater imagery relative to data collected with a conventional short pulse system.