Abstract
Flow noise is an important factor that limits the low-frequency detection performance of towed linear array sonar. Reducing flow noise is therefore one of the key problems in the design and application of towed sonar. In practice, it is often difficult to determine the contribution of flow noise directly from experimental data, which is a mixture of many noise sources. Based on the difference of spatial coherence scales among various noise sources, this paper gives a method that separates the flow noise component from received data. The theory of the method is given mathematically and the efficiency of the method is validated by real lake trial data.
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