Lidar-radar for underwater target detection using a modulated sub-nanosecond Q-switched laser

Li, Guangying; Zhou, Qiang; Xu, Guoquan; Wang, Xing; Han, Wei; Wang, Jiang; Zhang, Guodong; Zhang, Yifan; Yuan, Zhi'an; Song, Shengyuan; Gu, Shangtai; Chen, Fubin; Xu, Ke; Tian, Jinshou; Wan, Jianwei; Xie, Xiaoping; Cheng, Guanghua

doi:10.1016/j.optlastec.2021.107234

Cited by 28 publications

(9 citation statements)

References 37 publications

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“…Recent advances in LiDAR bathymetric sensors are going in many different directions. Some of these achievements include efficiency gains by increasing point density and penetration depth while maintaining equal accuracy over clear and cloudy water [ 119 ], and fast and automatic work with LiDAR data allowing for automatic calibration, registration and refraction correction, full wave processing, quality control, and data export. A solution to the problem of distinguishing signals reflected from the water surface and the bottom under shallow water conditions (less than 2 m) is also being developed [ 120 ].…”

Section: Directions Of Bathymetric Lidar Developmentmentioning

confidence: 99%

The Use of Green Laser in LiDAR Bathymetry: State of the Art and Recent Advancements

Szafarczyk

Toś

2022

Sensors

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Bathymetric LiDAR technology is a technology used for simultaneous data acquisition regarding the morphology of the bottom of water reservoirs and the surrounding coastal zone, realized from the air, e.g., by plane or drone. Contrary to the air topographic LiDAR, which uses an infrared wavelength of 1064 nm, bathymetric LiDAR systems additionally use a green wavelength of 532 nm. The green laser can penetrate the water, which makes it possible to measure the depth of shallow water reservoirs, rivers, and coastal sea waters within three Secchi depths. This article presents the theoretical basis for the construction of a green laser. Against the background of other methods of measuring the bottom of water reservoirs, the technology using waves from the visible light range is presented in detail in the assessment of the bottom morphology of shallow water reservoirs. The possibilities of using green laser in lidar bathymetry implemented in particular in non-navigable regions are shown. The results of the researchers’ work on river processes (erosion, sedimentation), design of stream restoration, determination of morphometric parameters of the riverbed, as well as assessment of the topography of the marine coastal bottom zones are summarized. The development direction of lidar bathymetry is discussed.

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Section: Directions Of Bathymetric Lidar Developmentmentioning

confidence: 99%

The Use of Green Laser in LiDAR Bathymetry: State of the Art and Recent Advancements

Szafarczyk

Toś

2022

Sensors

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“…The integrable passively Q-switched Nd:YAG/Cr:YAG microchip laser is effective to achieve high-repetition-rate, narrow-pulse-width (sub-ns), and high-peak-power pulse sequence [1,2]. As it does not require complex extra modulation devices, it can be applied to various complex settings, including high-precision laser ranging, laser medical treatment, and lidar [3][4][5][6]. However, compared with the actively Q-switched laser, the passively Q-switched microchip laser has several drawbacks: 1) a limited hold-off of 6-8 dB for the passively Q-switched microchip laser, which limits the gain and energy extraction [7], 2) a residual non-saturable absorption in the Cr:YAG saturable absorber that leads to a decrease in laser efficiency, and 3) a relatively large pulse timing jitter, particularly when the initial transmittance of the Cr:YAG saturated absorber is low.…”

Section: Introductionmentioning

confidence: 99%

Pulse-jitter reduction in passively Q-switched Nd:YAG/Cr:YAG microchip lasers by injection seeding actively Q-switched laser pulses

Chi,

Zhong,

Qiao

et al. 2023

Advanced Lasers, High-Power Lasers, and Applications XIV

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“…Quite recently, considerable attention has been paid to the detection and distinction of a target from clutter by using pulsed laser radar systems [1][2][3][4]. These systems are regarded to be superior to their radio frequency counterparts for detection applications, providing highly accurate distance measurement, range resolution, and anti-jamming feature.…”

Section: Introductionmentioning

confidence: 99%

Detection of a target hidden in dense cloud clutter using an echo pattern of pulsed laser radar systems

Bahmeh,

Zangeneh

2023

Laser Phys.

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The performance of pulsed laser radar systems has been known to be drastically reduced in dense clutter media, detecting false signals instead of the target. Therefore, high-performance laser radars have become demanding for detection applications. Here, using a multi-scattering Monte Carlo simulation, the pulsed laser radar performance is studied in dense cloud clutter (DCC), involving the role of the clutter extinction coefficient in the cloud return signal waveform of the target. After generating a large number of return signals from the clutter and the target, a unique and prominent feature is found to efficiently distinguish the two signals from each other with a resolution of 0.80 and a minimum signal to clutter ratio of 5.04 dB. A high-pass trapezoidal filter is also designed based on the characteristic feature in order to eliminate the clutter return signal. This proposed filtering method is justified by applying Fourier transform to the return power from the target and cloud, eliminating the clutter frequency response in a low frequency region. Accordingly, it is possible to detect a target hidden in DCC at short distances through receiving an echo pulse pattern.

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Lidar-radar for underwater target detection using a modulated sub-nanosecond Q-switched laser

Cited by 28 publications

References 37 publications

The Use of Green Laser in LiDAR Bathymetry: State of the Art and Recent Advancements

The Use of Green Laser in LiDAR Bathymetry: State of the Art and Recent Advancements

Pulse-jitter reduction in passively Q-switched Nd:YAG/Cr:YAG microchip lasers by injection seeding actively Q-switched laser pulses

Detection of a target hidden in dense cloud clutter using an echo pattern of pulsed laser radar systems

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