Performance analysis of optical Signal processing for real time Underwater lidar images

Abstract

newlineThere are several major application areas of underwater Light newlineDetection And Ranging LIDAR in use Due to rapid technological newlineadvancements in signal processing computers and laser technology nonacoustic newlineundersea lidar imaging has acquired immense significance The latest newlineunderwater lidar imaging device can precisely capture fast gated signals in newlinenano seconds in highly turbid water It permits the receiver to collect only the newlinesignal containing light pulses returned by the target and thus reduces the newlinewater scattering related noise of underwater signals dramatically As a result newlineit improves the intensity and contrast of the detected signal However it newlinesuffers from certain limitations like total attenuation backscatter forward newlinescatter power output contrast etc The absorption and scattering newlinecharacteristics of the marine medium severely limits the range performance newlineparticularly the visible range in turbid water The improvement of underwater newlinevisibility can be done by a reduction of the backscatter which limits the newlinecontrast of underwater signals either during capturing or after capturing newlineUnder Water Lidar Images UWLI In the present study it has been analyzed that visibility can be newlineimproved after capturing real time UWLI by the reduction of the backscatter newlinewith the Digital Signal Processor DSP Optical Signal Processor OSP newlineOSP with an optical feedback system and Hybrid Digital and Optical Signal newlineProcessor HSP newline newline newline