Study on reflection characteristics of underwater target and laser echo power

FLANN-based inter-code crosstalk suppression study for underwater laser communication

“…To overcome this limitation, this study introduces the binomial H-G function, which provides a better model for representing the double-peak scattering behavior in both forward and backward directions. By incorporating the formulation of the scattering phase function from reference [10], we obtain the expression as follows [9] ( ) (g , ) (1 ) (g , )…”

“…Underwater optical wireless communication (UWOC) channels refer to water bodies where lasers are used as the information carrier, with clean water or seawater serving as the transmission medium. UWOC has found extensive applications in target detection, feature extraction, and proximity communication, effectively bridging the performance gap in hydroacoustic communication [1][2][3][4]. Nonetheless, this communication method is susceptible to multipath effects caused by the time-dispersive nature of the channel.…”

“…In 2022, I. C. Ijeh et al investigated the performance analysis of a vertical UWOC link subject to oceanic turbulence and pointing errors and further investigate the appropriate selection of link parameters to optimize link performance [7]. Most studies on underwater channels have adopted the MC method for simulation purposes [8][9][10]. In a pioneering work, Jingwen Li integrated the MC method with the fourth-order Fourier transform to develop a mathematical model for underwater channel pulses [11].…”

Design and analysis of laser photoelectric detection sensor

“…When the projectile passes through the laser detection screen, the angle between the position of the projectile and the center axis of the laser detection screen is (), is the field of view, which is determined by the lens. If the intersection angle between the projectile and the detection screen is (assuming that the projectile passes through the detection screen vertically, the intersection angle is 0°), then the distance between the projectile and the optical receiving system is: Combining formulas () and (3), the laser echo power can be obtained as: According to the calculation method of the signal‐to‐noise ratio of the photoelectric detection system, 19 , is the background light power. The signal‐to‐noise ratio calculation model of the laser photoelectric detection sensor is established, which is: It can be seen that when the test environment illumination is basically unchanged and the laser emission power of the system is also determined, as the detection distance increases, if the position of projectile passing through the laser detection screen moves to the edge of the laser detection screen, and the laser echo power received by the photoelectric detector shows a decreasing trend, and the signal‐to‐noise ratio of the system also decreases.…”

Comparative Study on Polarization Spectral Parameters of Fruit in Southern Xinjiang Based on Roujean Model

“…In the field of materials, Yang Peiyan and others applied it to study the bi-directional properties of PTFE sheet diluent, aiming at reducing the temperature of the object under direct sunlight without refrigeration and consuming power [1]; Inoue and others used it to evaluate the surface morphology of paper, aiming at explaining the glossiness phenomenon of paper [2]. In the industrial field, Luongo et al [3] used it in the research of three-dimensional printing technology to provide a tool for users to estimate the reflectivity of printer control surface; Zhang Yingluo et al [4] used it in the design of underwater laser detection system. In the military field, Melvin et al [5] applied it to remote detection of mines and improvised explosive devices.…”