Modeling of Swath Sonar Target Detection Capability

Hughes Clarke

Chair Funding

As part of the new IHO standards, remarkable target detection capability is demanded. Currently all manufacturers claim that they meet or exceed these new standards. Field trials run jointly between the CHS and the OMG clearly indicate, that, whilst vertical accuracy criteria can be met, the target detection criteria built into these specifications can only be met under a very limited subset of operating conditions.

In order to understand the target detection processing, a numerical model has been built which replicates amplitude or phase detection for a given beam width, sidelobe level, noise level and bottom roughness mode. Using this model, the field performance of particular sonar may be examined and the effect of varying one of the parameters assessed. Targets of specific dimensions and backscatter strength attributes may be positioned at different locations within a swath to assess the changing target detection capability.