Abstract
The Displaced Phase Centre Antenna (DPCA) technique makes use of the correlation of sea bottom back scattering to determine the trajectory of a Synthetic Aperture Sonar (SAS). Multipath has been identified as the main environmental factor degrading the accuracy of DPCA in shallow water environments. An experiment has been carried out with Saclantcen’s 100 kHz multi-aspect SAS demonstrator deployed from R/V Alliance. The 256 channel receive array was placed, both horizontally and vertically, at various depths in shallow water channels, in order to quantify the relative levels of the multipath signals as a function of depth, range, sea state and bottom type. The ping to ping signal correlation was measured and compared with the results from a sonar performance model.
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