Using the ellipsoid surface radiator to reflect underwater UWB (Ultra Wide Band) signal is one of the effective methods to improve the propagation distance. But single-source bunching is affected by many factors and the efficiency has reached the limit. This paper analyzes the principle of dual-source bunching and establishes a focused sound field experimental system based on underwater plasma sound source (UPSS). The waveform and peak pressure of the UWB signal on the acoustic axis and the second focus plane were measured to reveal the distribution characteristics of the focused sound field. Analysis of the experimental results indicates that the dual-source bunching can significantly increase the peak pressure of the UWB signal with 3dB more than that of the single-source bunching. This research provides a basis for the design and implementation of multiple arrays bunching for underwater UWB signal.
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