A Parallel, Iterative Method of Mo- ments and Physical Optics Hybrid Solver for Arbitrary Surfaces

We have developed an MM-PO hybrid solver designed to deliver reasonable accuracy inexpensively in terms of both CPU-time and memory demands. The solver is based on an iterative block Gauss-Seidel process to avoid unnecessary storage and matrix computations, and can be used to solve the radiation and scattering problems for both disjunct and connected regions. It supports thin wires and dielectrica in the MM domain and has been implemented both as a serial and parallel solver. Numerical experiments have been performed on simple objects to demonstrate certain keyfeatures of the solver, and validate the positive and negative aspects of the MM/PO hybrid. Experiments have also been conducted on more complex objects such as an model aircraft, to demonstrate that the good results from the simpler objects are transferrable to the real life situation. The complex geometries have been used to conduct tests to investigate how well parallelised the code is, and the results are satisfactory. 0.1 Acknowledgements I would like to thank my advisor Professor Per Lötstedt for all the work he has been doing to help me nish this thesis. I also wish to thank Bo Strand from Saab-Avionics for the help he has provided over the years, it has been invaluable to me and without it no thesis would ever have been written. Furthermore I would like to thank Erik Söderström, Jonas Gustafsson and Stefan Hagdahl from Saab-Avionics for the di erent objects and geometries they have provided me with. Without them, the results would have been far less interesting. Last but not least I would like to thank Martin Nilsson from Uppsala University, who has been very important in the process of both writing and debugging the code. I would also like to point out that the Physical Optics Method of Moments hybrid code is loosely based on a Method of moments code from CERFACS, Toulouse, France.