Detection of an underwater target through modulated lidar experiments at grazing incidence in a deep wave basin

Pellen, Fabrice; Jezequel, Vincent; Zion, Guy; Jeune, Bernard

doi:10.1364/ao.51.007690

Cited by 28 publications

(7 citation statements)

References 15 publications

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“…LiDAR has been used for underwater target detection (UWTD), usually mines, as well as for coastal bathymetry [ 54 , 55 ]. It is normally surveyed at heights of hundreds of meters (Pellen et al survey mostly uniformly at 300 m [ 53 ]) with a swath of 100 to 250 m with a typical resolution in the order of decimeters.…”

Section: Sensors and Technologiesmentioning

confidence: 99%

Optical Sensors and Methods for Underwater 3D Reconstruction

Massot-Campos

Oliver-Codina

2015

Sensors

134

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This paper presents a survey on optical sensors and methods for 3D reconstruction in underwater environments. The techniques to obtain range data have been listed and explained, together with the different sensor hardware that makes them possible. The literature has been reviewed, and a classification has been proposed for the existing solutions. New developments, commercial solutions and previous reviews in this topic have also been gathered and considered.

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Section: Sensors and Technologiesmentioning

confidence: 99%

Optical Sensors and Methods for Underwater 3D Reconstruction

Massot-Campos

Oliver-Codina

2015

Sensors

134

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“…In a previous study, SNR > 0 dB is often a prerequisite for detecting target from noise background [21]. The SNR values (Fig.…”

Section: Filtering Efficiency Analysismentioning

confidence: 79%

“…To evaluate the effectiveness of filter, the improvement by the developed method is quantified through the classical performance assessment criteria [21][22][23][24]. The metric of eliminating water backscattering is defined by SBR as follows:…”

Section: Filtering Efficiency Analysismentioning

confidence: 99%

Improved time-of-flight range acquisition technique in underwater lidar experiments

et al. 2015

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This paper presents an underwater lidar time-of-flight ranging system that combines the variable forgivable factor recursive least-squares (VFF-RLS) adaptive filter algorithm and the constant fraction discriminator (CFD) timing technology. The effectiveness of suppressing the backscattering and increasing timing accuracy is experimentally verified in the water basin under the different target distances, especially near the detection limit. The classical RLS is creatively transformed by introducing the VFF, which is highly correlated to the target echo at any distance. The improvement of the signal-to-backscatter ratio always exceeds 18.9 dB. The Monte Carlo simulation proves the applicability of the proposed method in the media of different turbidity. The influences of the selective timing methods on the walk error and time jitter are compared, and the optimum zero point of CFD is achieved by the slope analysis of leading (falling) edge in experimental target pulses.

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“…give clues to detect micro-Doppler signature, where vibrations and rotations have to be discriminated [16]. As the method can be used with virtually any Q-switched lasers, it could be applied with green lasers for underwater remote sensing where visible light is mandatory [4,17].…”

Section: Resultsmentioning

confidence: 99%

Lidar–radar velocimetry using a pulse-to-pulse coherent rf-modulated Q-switched laser

et al. 2013

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An rf-modulated pulse train from a passively Q-switched Nd:YAG laser has been generated using an extra-cavity acousto-optic modulator. The rf modulation reproduces the spectral quality of the local oscillator. It leads to a high pulse-to-pulse phase coherence, i.e., phase memory, over thousands of pulses. The potentialities of this transmitter for lidar-radar are demonstrated by performing Doppler velocimetry on indoor moving targets. The experimental results are in good agreement with a model based on elementary signal processing theory. In particular, we show experimentally and theoretically that lidar-radar is a promising technique that allows discrimination between translation and rotation movements. Being independent of the laser internal dynamics, this scheme can be applied to any Q-switched laser.

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Detection of an underwater target through modulated lidar experiments at grazing incidence in a deep wave basin

Cited by 28 publications

References 15 publications

Optical Sensors and Methods for Underwater 3D Reconstruction

Optical Sensors and Methods for Underwater 3D Reconstruction

Improved time-of-flight range acquisition technique in underwater lidar experiments

Lidar–radar velocimetry using a pulse-to-pulse coherent rf-modulated Q-switched laser

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