Numerical Computational Technique for Scattering from Underwater Objects

Defence Science Journal

T. Ratna Mani²  Raj Kumar¹  Odamapally Vijay Kumar² 

[1] Defence Institute of Advanced Technology, Pune;Naval Physical and Oceanographic Laboratory, Cochin

关键词: Mono-static;    bi-static;    acoustic wave;    scattering;    finite element time domain method and ramp response technique;   

DOI  :  

学科分类：社会科学、人文和艺术（综合）

来源: Defence Scientific Information & Documentation Centre

【 摘 要 】

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4This paper presents a computational technique for mono-static and bi-static scattering from underwater objects of different shape such as submarines. The scatter has been computed using finite element time domain (FETD) method, based on the superposition of reflections, from the different elements reaching the receiver at a particular instant in time. The results calculated by this method has been verified with the published results based on ramp response technique. An in-depth parametric study has been carried out, by considering different pulse frequency, pulse length, pulse type (CW, LFM , SFM), sampling frequency, as well as different size , shape of the scatteringbody and grid size. It has been observed that increasing the pulse frequency, sampling frequency and number of elements leads to improved results. However, good amount of accuracy has been achieved with element size less than one third of wave length. The experimental result of the underwater object has been found very close to the`simulated result. This technique is useful for computing forward scatter for inverse scattering applications and as well as to generate forward scatter of very narrow and wide band signals of any pulse type and shape of body. Defence Science Journal, 2013, 63(1), pp.119-126 ,  DOI:http://dx.doi.org/10.14429/dsj. 63.779

【 授权许可】

Unknown