Time - Domain Higher Order Nystr - M Method For Mixed Targets Of Metal Media

In the field of computational electromagnetic, the frequency domain method has occupied a dominant position for a long time. The time domain method has many outstanding advantages in the research of broadband electromagnetic problems and transient electromagnetic problems, and with the increasing analysis need of electromagnetic problems including EMC, anti stealth technology, antenna radiation and transient signal, the necessary for the analysis time domain integral equation method is becoming more and more urgent. The time domain integral method can be divided into marching on the time (MOT) and marching on the degree (MOD). How to solve the impedance matrix equation as quickly as it can be and reduce the computation time and memory consumption as much as possible is a basic index to evaluate the superiority of algorithm also is the eternal objective many scholars pursue diligently in the industry.High-order methods have the advantage that the fewer unknown needed be calculated to get the same accuracy by adopting high-order curved elements for modeling object and describing the unknown source in dividing unit with high-order basic function, however the basic function for high-order method is pretty complex, the process of constructing model is annoying, and the state of the matrix is bad. The high-order Nystrom method this article is talking about is a kind of classic high-order method based on the discrete points, not only has the advantages of the traditional high-order methods, but the requirement for the grid is low and the convergence for calculation is good. In view of the high efficiency of high-order Nystrom method and the prominent advantages in analysis for specific problems of time domain integral method, the time domain integral method based on the high-order Nystrom method this paper presents has special engineering application and academic research significance.According to the specific physical location of field point and source point, adopting different calculation strategy for the near field and far field in the iterative solution is an efficient method for promoting the ability of algorithms in the analysis of electrically large scattering problem size, frequency domain integral equation makes an important step in solving practical electromagnetic problems by introducing the multi-lever fast multi-pole technique, plane wave time domain is a kind of time domain fast method with rigorous mathematic foundation developed from the multi-lever fast multi-pole technique. Finally plane wave time domain technique is introduced into time domain integral equation high-order Nystrom method based on MOT, which expand the ability of the latter in solving practical electromagnetic problems greatly.