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Acoustic source plays an important role in the field of underwater, radar, seismology, sonar systems and biomedical imaging etc. Acoustic source localization and tracking using the microphone array has become a focus of interest of many researchers. The main aim is to accurately estimate the Direction of Arrival (DoA) of multiple acoustic sources using an array of transducers. Traditionally, developed methods (MuSiC, ESPRIT, etc.) use the uniform linear array to resolve the multiple sources. To improve the target resolution, a general method is to increase the sensor in the array to extend the array aperture. Accordingly, the cost of manufacturing and data processing are increased. Techniques to achieve the high resolution with high accuracy using few number of sensors array is proposed in this paper. We enhance the array aperture using the concept of virtual array. The sensors position of virtual array is given by the spatial covariance lag. We generated the virtual array using the higher order statistic. We have also done the comparative study of the performance of uniform linear array, non-uniform linear array and virtual array. The simulation results show that the virtual array corresponding to designed array estimate the DoA with high accuracy. Besides, it can find more sources than traditional uniform linear array with the same number of sensors and resolve close sources.
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