Estimation of wave source position by using spherical wave function

Estimation of wave source position is important technique for searching unknown noise source in EMI and EMC measurement. In this paper a new estimation technique for searching the position of wave source is proposed by using spherical vector wave function and point matching method. In our method a few virtual boundaries are placed on surrounding space encompassed the unknown wave source. Then, applying the boundary condition on the virtual boundaries, the unknown coefficients in the spherical vector wave function can be obtained. In order to verify the validity of this method, numerical experiments are carried out. As the result of them, position of unknown wave source can be estimated accurately by using our method.