Akademik Veri Yönetim Sistemi
Progress In Electromagnetics Research Symposium, Stockholm, İsveç, 12 - 15 Ağustos 2013, ss.184-187
This paper presents the application of a real-time electromagnetic target classification technique to recognize dispersive dielectric objects with varying loss characteristics. The suggested classifier design technique is operative at the resonance region and is based on the use of Singularity Expansion Method (SEM) to represent a given electromagnetic scatterer by its natural response. A multi-aspect database of wide band scattered signals are processed to extract target features with the ultimate aim of target characterization in an aspect invariant manner. The Wigner distribution (WD), a quadratic time-frequency transformation, is used to extract pole-related feature vectors from non-stationary scattered signals. The Principal Components Analysis (PCA) is further used to fuse multi-aspect feature vectors to obtain a single unified feature vector for each library object. A suitable late-time design interval needs to be chosen to obtain fused features with minimized aspect sensitivity that is a vital requirement for improved classifier accuracy.