Wide-Angle Parabolic Equation Method For Multi-objects RCS Computation

Nowadays, there are many mature numerical methods in electromagnetics computation field. But these methods generaly can not be accomplished when they are used in solving electromagnetic scatter of the eletrically large objects because of limitation of time and memory of computer. Obviously, they are not good choices. Recently, parabolic equation method(PE) is presented again, which can be used in computing electromagnetic scatter. However, it can avoid the problems advanced above. As a result, the method can reduce the time of computation and the error instead of the high-frequency approximation caustics at the same time.In this paper, claerbout approximatation is applied to expanding parabolic equation operator. Moreover, Claerbout approximatation is of great advantages, such as increasing PE paraxial calculational angle from 0~15° to 0-40°, decreasing times of rotating axes and saving plenty of time. It contributes to disposing eletrically large objects' bistatic RCS computation. My paper covers the following points:1. The wide-angle claerbout parabolic equation in free space and PML is deduced from wave equation, so that the angle is expanded to 0-40° . Furthermore, the times of rotating is decreased. It is the foundation of the solution of eletricallylarge objects' bistatic RCS computation in actual engineering.2. Parabolic equation is differenced by Crank-Nicolson finite-differce method in order to simply the transfermation of spatial matrix. Thus, the scatter field on any section can be obtained from the former section by simlpe matrix trasform, which accelerate the computation. The boundary is truncated by PML, at the same time it is deduced by Crank-Nicolson finite-differce form. The far scatter field is solved by Fourier near-far field transform.3. We caculate the bistatic RCS of some single objects and multi-objects. Compared with MOM, the result proved that the method is rapid and appropriate.The research into PE method offers an important academic foundation to design radar and caculate scatter objects. It is of great importance in many respects, such asenhancing the identify and estimation of the radar, strengthening the viability of object and researching on the stealth and antitstealth technology, radar detecting and radar target recognition.