Performance Analysis of CEM Techniques for Prediction of RCS of a Complex Shaped Body

摘要

There are several challenges in the area of computation and measurement of RCS of large targets, such as, aircrafts, tankers, and ships of modern design. Several computational electromagnetic (CEM) techniques have been developed over the years to compute the RCS of such large targets, and each technique has its own advantages in certain applications. The selection of a suitable technique for RCS calculations may depend on the main objective behind the scattering calculations, the geometry of the target and the frequency of operation. In this paper, the performance of three CEM techniques, namely, the Method of Moments (MoM), Multi Level Fast Multipole Method (MLFMM) and Physical Optics (PO), have been studied and compared. For illustrative purposes, the RCS prediction of a perfectly electrically conducting (PEC) aircraft has been chosen. The performance comparison is done from resonance region to optical region in order to illustrate the range of the applicability, validity, and accuracy of the chosen CEM techniques. Bistatic RCS results are presented for an aircraft, whose electrical size is varied from IX to 233X.