We propose a synthetic aperture technique for a twin-line array. The towed line array system has been investigated in underwater environments to improve the signal-to-noise ratio and angular resolution. But to achieve that, it required a long aperture size. It caused physical problems-fluctuations, sensor positioning, towing array etc. It has a left-right ambiguity at the receiver between the opposite angles. To resolve these problems, we use a twin-line. It cause an angular error due to the shorter aperture size when the same number of sensors is used. To improve the signal-to-noise ratio and angular resolution we process the synthetic aperture for the twin-line. A method is presented here that synthesizes apertures in the beam domain using FFT and performs coherent processing of sub-aperture signals at successive time intervals.
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