In this paper, by using numerical technique of electromagnetic EM scattering calculation, the narrowband and wideband high resolution angular glint of a generic warhead is studied. Emphasis is put on the glint calculation method derived from complex high-resolution range profiles (HRRP), as well as the analysis of radar cross section (RCS) and angular glint characteristics for each down range resolution cell.
A continuous incremental updating technique is proposed for efficient maintenance of the mining association rules when new transaction data are added to a transaction database. FP-growth algorithm can mine the complete set of frequent patterns by pattern fragment growth. To efficient maintenance of the mining association rules, we improve the FP-growth algorithm in three aspects: 1) an optimization technique for reducing the database size during the update process is discussed, and 2) the construction algorithm of a transaction tree T-tree, and 3) the candidate pattern pools are proposed based-on the structure of T-tree. Then, a continuous incremental updating algorithm, or CIU algorithm for short, is proposed. Our performance study shows that the continuous incremental updating technique is efficient and scalable for mining both long and short frequent patterns.
Angular glint is a significant electromagnetic (EM) scattering signature of extended radar targets. Based on the adaptive cross approximation (ACA) algorithm accelerated method of moments (MoM) and the plane incident wave assumption, the narrowband, wideband and newly developed high-resolution range profile (HRRP) based angular glint calculation formulations are derived and applied to arbitrarily shaped three-dimensional (3D) perfectly electrically conducting (PEC) objects. In addition, the near-field angular glint is emphasized, which is of great importance for radarseeker applications. Furthermore, with the HRRP based angular glint, an approach to rigorously determine range resolution cells which own relatively smaller angular glint is provided. Numerical results are presented with new findings to demonstrate the usefulness of the developed formulations.
Based on recently developed near-field iterative physical optics (NFIPO) and the Poynting vector method, near-field angular glint calculation formulations are derived and applied to perfect electric conducting (PEC) radar targets, which are of great importance for radar seeker applications. Numerical results are presented with new findings to demonstrate the usefulness of the proposed technique.
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