منابع مشابه
Introduction to sonar
SONAR is the acronym for SOund Navigation And Ranging. Sonar techology is similar to other technologies such as: RADAR = RAdio Detection And Ranging; ultrasound, which typically is used with higher frequencies in medical applications; seismics, which typically uses lower frequencies in the sediments. The knowledge and understanding of underwater sound is not new. Leonardo Da Vinci discovered in...
متن کاملSonar Target Classification with Sonar Fingerprint
To recognize underwater target precisely is always a hot potato to navies due to the complicated watery environment. It’s different from the aerial circumstance. There is much more interfere under the sea. Sonar is the most efficient way to detect underwater world at present time. In this paper, a geneticbased classifier system is designed which recognizes targets by sonar fingerprints. This me...
متن کاملTraining Radial Basis Function Neural Network using Stochastic Fractal Search Algorithm to Classify Sonar Dataset
Radial Basis Function Neural Networks (RBF NNs) are one of the most applicable NNs in the classification of real targets. Despite the use of recursive methods and gradient descent for training RBF NNs, classification improper accuracy, failing to local minimum and low-convergence speed are defects of this type of network. In order to overcome these defects, heuristic and meta-heuristic algorith...
متن کاملPassive Sonar Performance Modeling
Accurate passive acoustic (ASW) performance modeling requires high-fidelity environmental inputs, accurate acoustic propagation and noise modeling as well as the integration of the statistics of the detection of quiet signals in a dynamic environment. In this paper we present the combination of Parabolic Equation modeling with state of the art statistical signal processing to be able to incorpo...
متن کاملNarrowband Passive Sonar Tracking
Passive sonar sensors are the main source of information for a submerged submarine. Modern sonar systems like ISUS 90 offer a number of acoustic antennas and combined signal processing for broadband and narrowband detection and analysis of target noise. While broadband detection is often used to obtain an overview of the targets surrounding the own ship, narrowband processing enables the detect...
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ژورنال
عنوان ژورنال: Nature
سال: 1985
ISSN: 0028-0836,1476-4687
DOI: 10.1038/314201a0