Parametric array differential Pattern time delay shift coding underwater acoustic communication in the under-ice environment

A differential Pattern time delay shift coding underwater acoustic communication method based oil parametric array has been proposed in order to meet the demands of underwater acoustic communication in the under-ice environment which is characterized by heavy multipath transmission. A parametric array transduction method of Pattern signal has been derived and the system performance was analyzed. The transduction method can obtain a broadband low frequency narrow sound beam which will reduce the interface reflections then suppress the effects of multipath transmission. The Songhuajiang under ice trial results show that the proposed approach has an anti-multipath property and a higher data rate in under ice underwater acoustic channel.