Research On Performances Simulation Of Multi-beam Bathymetric Algorithms

Multi-Beam Swath Bathymeter (MBSB) is a seabed measure system with high efficiency and high resolution, which developed from echo sounder, and fits for the wide sweep mapping especially.By far, various kinds of products of MBSB has been developed. And the bathymetric algorithms are mainly divided into two types: based on amplitude (such as Energy detection method, WMT and BDI) and phase(split-beam phase difference method and multiple sub-array detection). In order to obtain the data of depth precisely and accurately, it is important to improve the performance and accuracy of the multi-beam bathymetric algorithms.In this thesis, the task has been divided into the following three aspects:Firstly, based on the element scattering theory, the model, which has been formed by seafloor reverberation simulator, is developed by means of simulating the generating process of the seafloor reverberation.Secondly, bathymetric algorithm theory based on amplitude and phase has been compared and analyzed. By the processing of reverberation simulated signal, the depth of the simulated seabed has been calculated. Besides, the true depth of seabed is obtained by treating with the sea experiment data.Finally, parameters (such as the number of element, the width of pulse and the grazing angles) which affect the whole algorithm performance have been given and analyzed by studying the algorithm theories. By simulating the mainly influential factors of specific bathymetric algorithm, the multibeam accuracy and the condition of application has been given. And the method of improving the performance on the specific algorithm is proposed.