Design of an Embedded Communication System for Underwater Asynchronous Localization

Most applications of underwater acoustic sensor networks (UASNs) rely on reliable location information. In this letter, we present an embedded communication system for underwater asynchronous localization. An asynchronous localization protocol is developed and encoded for the actual implementation on an embedded communication system. Particularly, the embedded communication system is composed of four transducers, one control center and four acoustic modems. In order to reduce the effect of multipath interference, the direct-sequence spread-spectrum (DSSS) technology is applied to the design of modem. Meanwhile, the iterative least squares method is implemented to estimate the position. Finally, experimental results are given to verify the effectiveness of the proposed system. It is demonstrated that the influences of asynchronous clock can be well eliminated.

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