Passive AUV tracking using sound produced by shrimps

An autonomous Underwater Vehicle (AUV) is a self driven vehicle travelling underwater and used for variety of purposes. Sometimes, for proper operation of AUVs, it is important to know where the AUVs are, particularly the depth. Usually depth of AUV is measured using an active technique where a known signal is transmitted and ocean ambient noise (OAN) generated in the ocean is considered as noise. However, the technique described in this paper makes use of this OAN rather than transmitting anything. Theoretical and experimental analyses show that if AUVs are travelling in the shrimp dominated area then the depth of the AUVs can be estimated using a passive technique.