Mohammad Reza Mosavi - Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
Mohammad Khishe - Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
Ehsan Ebrahimi - Department of Electrical Engineering, Imam Khomeini University of Maritime Sciences, Nowshahr Iran

Due to the complex physical properties of the detected targets using sonarsystems, identification and classification of the actual targets is among the mostdifficult and complex issues of this field. Considering the characteristics of thedetected targets and unique capabilities of the intelligent methods in classificationof their dataset, these methods seem to be the proper choice for the task. In recentyears, neural networks and support vector machines are widely used in this field.Linear methods cannot be applied on sonar datasets because of the existence ofhigher dimensions in input area, therefore, this paper aims to classify such datasetsby a method called Online Multi Kernel Classification (OMKC). This method uses apool of predetermined kernels in which the selected kernels through a definedalgorithm are combined with predetermined weights which are also updatedsimultaneously using another algorithm. Since the sonar data is associated withhigher dimensions and network complexity, this method has presented maximumclassification accuracy of 97.05 percent. By reducing the size of input data usinggenetic algorithm (feature selection) and statistical moments (feature extraction),eliminating the existing redundancy is crucial; so that the classification accuracy ofthe algorithm is increased on average by 2% and execution time of the algorithm isdeclined by 0.1014 second at best.

Sonar, Classification, OMKC, Genetic Algorithm, Statistical Moments, Clutter