KEYWORDS: Mass attenuation coefficient, Signal to noise ratio, Signal attenuation, Environmental sensing, Solar radiation, Water, Reflectivity, Amplifiers, Modeling, Laser systems engineering
The paper presents selected issues on laser systems for detection and location of underwater objects. Range detection
analysis and simulations include influence of: i) parameters of rangefinder; ii) parameters describing properties of the
searched under-water object; iii) parameters of water environment, in particular hydro-meteorological conditions and
extinction coefficient, characterizing water transmission properties. This transmission undergoes cyclic and strong
changes in time and is strongly area-diversified. In the analyzed regions, average extinction coefficient changes from
0.3 m-1 to 2.4 m-1, whereas optimal laser wavelength falls into the spectral range of 575-580 nm. The analysis of the
background radiation power has shown, that its value varies from several nW to about 25 nW in dependence of the
incidence angle of solar radiation. Therefore, in further calculations we assumed the background radiation power equal to
its average value of 9 nW. Having already estimated the signal power and the background noise power, signal to noise
ratio (SNR) could be determined. The assumption, that the minimal SNR is 17.5 dB, results in the range detection of
under-water objects varying from 7 m to 30 m. This range permits effective detecting and position determining of underwater
objects like containers or anchor mines.
KEYWORDS: Signal to noise ratio, Mass attenuation coefficient, Signal attenuation, Laser systems engineering, Environmental sensing, Signal detection, Sensors, Reflectivity, Interference (communication), Receivers
Paper presents selected issues on laser systems for detection and location of underwater objects. Specific influencing
factors, as hydro-meteorological as well as environmental conditions, are also discussed. For the assumed parameters of
proposed laser rangefinder model, on the basis of additional experimental results, an analysis and numerical calculations
of background noise power, signal power and signal to noise ratio at the output of receiver have been performed.
Thereby, the effective detection ranges of underwater objects under various meteorological conditions in different
seasons have been obtained.
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