Using the Interpolative Decomposition to Accelerate the Evaluation of Radome Boresight Error and Transmissivity

Based on the method of moments, the interpolative decomposition (ID) technique is extended to accelerate the evaluation of radome boresight error (BSE) and transmissivity, which belongs to electromagnetic radiation problems with the right-hand side (RHS) matrix containing multiple vectors. Because the RHS matrix from radiation problems has many null rows, the matrix can be first reduced to a compressed form, then decomposed by the ID technique to figure out the skeleton RHS vectors by exploiting its rank-deficient property. Iterative solutions are only executed for these skeleton vectors, followed by the restoration process to obtain the full solutions. Compared with the existing ID methods designed for scattering problems, the proposed ID method is much easier to implement and companied with a high solution efficiency. Numerical experiments are performed on an antenna array enclosed by a radome to evaluate the BSE and transmissivity, illustrating the performance and accuracy of the proposed method.