&lt;title&gt;Radiofrequency modulation on optical carrier for target detection enhancement in seawater&lt;/title&gt;

Pellen, Fabrice; Olivard, Pascal; Guern, Y.; Cariou, J; Lotrian, J

doi:10.1117/12.452828

Cited by 7 publications

(1 citation statement)

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“…Multiple underwater laser-based ranging technologies have been developed, such as range-gated [1,2], modulated lidar [3,4], and streak tube imaging [5]. However, they have disadvantages in the miniaturization and portability of the detection system, the online processing of the measuring data, and the real-time results display.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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A scheme of pulse compression lidar with enhanced modulated bandwidth for detection through scattering media

Yang

Zhang

Jin

et al. 2016

Optics Communications

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Monte Carlo simulation for modulated pulse bathymetric light detecting and ranging systems

Liang

Yang

Xia

et al. 2006

J. Opt. A: Pure Appl. Opt.

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A modulated light detecting and ranging (LIDAR) system has been developed to improve the detection of underwater targets. To study this detection scheme, this paper proposes a Monte Carlo simulation method for modulated pulse LIDAR systems. First, a Monte Carlo model is developed to simulate modulated pulse propagation in sea water. Second, a receiving system model is emulated with advanced signal processing tools like Fourier transform, cross-correlation and filtering. The simulation program based on the model is realized. This program is capable of predicting experimental results and helping in the design of more advanced transmitter and receiver configurations as various parameters of the environment, modulation and geometry are taken into account in our design. The calculations of backscattering frequency responses with different attenuation coefficients exhibit the low-pass filter-like response of backscattering. The modulated LIDAR results for a target depth of 5 m and attenuation coefficient of c = 0.67 and 0.85 m −1 are also computed. It is validated that the modulation approach can suppress volume backscattering clutter and can enhance the target contrast. Furthermore, comparisons with reported experimental results indicate the feasibility of the simulation model.

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<title>Radiofrequency modulation on optical carrier for target detection enhancement in seawater</title>

Cited by 7 publications

References 0 publications

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

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

A scheme of pulse compression lidar with enhanced modulated bandwidth for detection through scattering media

Monte Carlo simulation for modulated pulse bathymetric light detecting and ranging systems

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