Analysis Of Transient Scattering From High Dynamic Target

The analysis of the transient scattering characteristics is to study the response signalthat is generated from the interaction between the object and exciting wave. It is thebase for target imaging, recognition and tracking. Study of the transient scattering fromarbitrarily shaped conducting body coated with lossy materials can provide importantreference for stealth and anti-stealth technology. As one of the indispensabletechnologies for target imaging, tracking and recognition of modern radar, research ofthe transient scattering from hypervelocity and combined rotating target has greatsignificance. This thesis is concerned with the transient scattering problem from objects,either coated or in arbitrarily motion. The main advances are as follows:1) For the transient scattering problem from PEC (perfect electrically conducting)bodies. A comparative study of stability and accuracy is conducted by choosing5-ordersLagrange interpolating functions and Quadratic B-Spline basis functions as thetime-domain basis to discrete time domain integral equations, respectively.2) To address the transient scattering problem from the coated conductors, we havedeveloped two different ways, both of them are based on TDIE. The first method namedTDIE-TDS is to replace the coating layer with an equivalent volume electric current andan equivalent volume magnetic current, both of which can be expressed by the physicalsurface current on the conductor. The second method named TDIE-IBC is to express theequivalent magnetic current on the surface of the coating by the equivalent electriccurrent, so that we just need to solve the equivalent electric current on the surface of thematerial. Numerical results indicate that both of these two methods are correct andeffective. The effectiveness of these two methods is illustrated by comparisons with thegeneral coupling integral equation method. The number of unknown was reduced byhalf, the storage requirement and computing complexity have been reduced toone-fourth, approximately.3) For analysis of the transient scattering from hypervelocity and complex rotatingtarget, the frame-hop-method (FHM) based on Einstein’s general theory of relativity, isemployed. In such way, we can analyze any kind of mixed-moving target, including hypervelocity, spinning, coning and nutation, etc.