Compression and Radiation of High-Power Short Rf Pulses. I. Energy Accumulation in Direct-Flow Waveguide Compressors

Abstract

Abstract-Proper design of efficient microwave energy compressors requires precise understanding of the physics pertinent to energy accumulation and exhaust processes in resonant waveguide cavities. In this paper, practically for the first time these highly non-monotonic transient processes are studied in detail using a rigorous time-domain approach. Additionally, influence of the geometrical design and excitation parameters on the compressor's performance is quantified in detail.

Blocked spectrum compressive sensing based on Root-MUSIC algorithm for SAR image

“…roots of the polynomial can be calculated by root-MUSIC algorithm: (10) the frequency domain sparse reconstruction model can be written as [12]: X Ψα (11) where > @…”

The Exact Absorbing Conditions Method in the Analysis of Open Electrodynamic Structures: Circular and Coaxial Waveguides

“…For the same reason, the boundary conditions given by (29)-(31) can be considered as exact boundary conditions: the wave ( , ) is not distorted when crossing the boundary Γ ; there is no reflection into the domain Ω int ; the wave ( , ) passes into the domain Ω completely, as if it is absorbed by that domain or by its boundary Γ . For the first time, (23) and (29) were used as exact absorbing boundary conditions in [1].…”

“…The method utilizing the exact absorbing conditions for the artificial boundaries that truncate an unbounded domain of computation [1-9, 20, 21] is outnumbered by the classical approximate approaches. However, testing numerical experiments as well as a series of physical and applied results obtained with the help of this method (see, e.g., [3,5,8,[21][22][23][24][25][26][27][28][29][30]) shows its evident potential, especially, for obtaining reliable numerical data on space-time and space-frequency electromagnetic field transformations in open waveguide, periodic, and compact resonators.…”

Effect of Threshold Value on the Performance of Natural Frequency-Based Radar Target Recognition

“…Multiple-input and multiple-output (MIMO) radar, bistatic radar and multi-static radar [51, 84,85,124,[130][131][132][133][134][135][136][137] have been employed to detect low-RCS target. Pulse compression proved to be an effective way to enhance the performance of radar target detection and recognition [138][139][140]. In addition, ultra-wideband (UWB) radar [71,89,[141][142][143][144][145][146] has been employed to improve the performance.…”