نتایج جستجو برای: isar

تعداد نتایج: 812  

Journal: :IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing 2021

The airborne synthetic aperture radar (SAR) image of ship target will be blurred for the complex motion target, which influence performance feature extraction and classification. In this article, a refocusing method in SAR though inverse (ISAR) technique is presented. novel contributions article can summarized as follows: 1) residual phase processed signal analyzed detail to illustrate necessit...

Journal: :Remote Sensing 2022

Deep learning has been used in inverse synthetic aperture radar (ISAR) imaging to improve resolution performance, but there still exist some problems: the loss of weak scattering points, over-smoothed results, and universality generalization. To address these problems, an ISAR enhancement method exploiting a generative adversarial network (GAN) is proposed this paper. We adopt relativistic aver...

Journal: :IEEE Transactions on Aerospace and Electronic Systems 2022

The concept of sub-terahertz (sub-THz) imaging and recognition space objects by a satellite-based inverse synthetic aperture radar (ISAR) is proposed analyzed in this article. Operation at sub-THz frequencies the band 200–400 GHz benefits from wide available bandwidth, high sensitivity to surface texture, very small target features, requires an antenna physical size. A feasibility study present...

Journal: :Remote Sensing 2022

Plasma sheath poses a serious challenge to inverse synthetic aperture radar (ISAR) imaging of hypersonic targets. This paper investigated the distribution characteristics electron density and velocity field in plasma surrounding target various flight scenes. The incident depth reflective surface electromagnetic (EM) waves with X-band, Ku-band, Ka-band can be determined based on frequency. We es...

Journal: :Journal of the Korean Society for Aeronautical & Space Sciences 2015

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه یزد 1389

روش معمول برای بازسازی تصویر در isar بکارگیری پردازش فوریه می باشد که در آن تغییرات داپلر از نقاط مختلف هدف از مولفه های تبدیل فوریه استخراج می شود. نتایج نشان می دهد زمانیکه حرکت هدف پیچیده و مانوردار است این روش کارایی نداشته و تصویر حاصل از آن مات خواهد بود. این موضوع در این پروژه نیز بوضوح مشاهده وتایید شده است. حل مشکل دستیابی به تصاویر واضح از اهداف مانوردار یکی از پیچیده ترین بحث های تص...

2012
Hannes Leischner Elena Razumovskaya Karsten Spiekermann Stefan Bohlander Lars Rönnstrand Katharina Götze Christian Peschel Justus Duyster

1Department of Internal Medicine III, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany; 2Experimental Clinical Chemistry, Wallenberg Laboratory, Department of Laboratory Medicine, Lund University, Skåne University Hospital, Malmö, Sweden; and 3Department of Internal Medicine III, Laboratory of Leukemia Diagnostics, Ludwig-Maximilians-University-Campus Grosshadern, Munic...

2014
Shubhajit Datta

This paper deals with application of Radar (ISAR) image for the safety applications in Intelligent Transport System (ITS).Comparative performance of conventional Fourier transform and joint time-frequency transform for the formation of Radar image is given here, Matlab(version 10) is used as the simulation platform and finally by comparing images obtained by two techniques ,the work is validated.

2009
Beate Spiessberger Dieter Saur Ursula Seidler Anurag K Singh Robert Lukowski Franz Hofmann

Address: 1For 923 at Institut für Pharmakologie und Toxikologie, TU München, Germany, 2Department of Internal Medicine II, Klinikum Rechts der Isar, TU München, Germany, 3Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Germany, 4Department of Pharmacology and Toxicology, Universität Regensburg, Germany and 5Institut für Pharmakologie und Toxikologie, TU Mü...

2004
Lucas Dixon Jacques D. Fleuriot

We present an account of rippling with proof critics suitable for use in higher order logic in Isabelle/IsaPlanner. We treat issues not previously examined, in particular regarding the existence of multiple annotations during rippling. This results in an efficient mechanism for rippling that can conjecture and prove needed lemmas automatically as well as present the resulting proof plans as Isa...

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