Based On The High-frequency Rcs Modeling And The Applications Of The Method

Graphical Electromagaaetic Computing(GRECO) is extended to bistatic Radar Cross Section(RCS) calculation of Complex Target in high frequency band by Physical Optics(PO) and Incremental Length Diffraction Coefficients(ILDC). In the aspect of application,this thesis analyzes the time-frequency characteristics of some Micro-motions targets.Then,with Viterbi algorithm, multi-component signal is separated into each component signal. The work of this paper includes the following three parts.1.GRECO is extended to bistatic RCS calculation. The calculating result of some standards targets like plate, sphere, cylinder and cone is accurate.This approach is applicable for the research work of radar networking and stealth or anti-stealth technology.2.The theory of incremental length diffraction coefficient (ILDC) is an effective method for edge diffraction calculation of electrically large complex targets.Thus,physical theory of diffraction is generalized to arbitrary direction. In this paper, a flat’s ILDC is computed correctly.3.The time-frequency characteristics of targets with Micro-motions is analyzed. In particular, for multi-component signal, Viterbi algorithm is used to estimate the instantaneous frequency first, cover function is designed then, time-frequency distribution of each component is got last.For a single component signal, time-frequency filter can extract the useful signal from the noise.