Results 41 to 50 of about 14,909 (237)
Automatic refocus and feature extraction of single-look complex SAR signatures of vessels [PDF]
, 2016 In recent years, spaceborne synthetic aperture radar ( SAR) technology has been considered as a complement to cooperative vessel surveillance systems thanks to its imaging capabilities.
Mallorquí Franquet, Jordi Joan +1 more
core +2 more sources
Image Reconstruction Using Autofocus in Single-Lens System
Applied Sciences, 2022 To reconstruct the wavefront in a single-lens coherent diffraction imaging (CDI) system, we propose a closed-loop cascaded iterative engine (CIE) algorithm based on the known information of the imaging planes.
Xuyang Zhou +5 more
doaj +1 more source
An Efficient Solution to the Factorized Geometrical Autofocus Problem [PDF]
, 2016 This paper describes a new search strategy within the scope of factorized geometrical autofocus (FGA) and synthetic-aperture-radar processing. The FGA algorithm is a fast factorized back-projection formulation with six adjustable geometry parameters.
Dammert, Patrik +3 more
core +1 more source
Fast ISAR autofocus algorithm via sub-aperture
The Journal of Engineering, 2019 Translational motion compensation (TMC) is a significant step for inverse synthetic aperture radar (ISAR), while phase autofocus plays an important role in TMC.
Jinjian Cai +3 more
doaj +1 more source
Leida xuebao, 2022 The radar echo signal may experience substantial two-dimensional spatial variance due to the nonlinear Synthetic Aperture Radar (SAR) trajectory. The traditional frequency-domain imaging algorithms based on the assumption of azimuth translational ...
Jianlai CHEN +5 more
doaj +1 more source
Clustered Sparsity-Driven SAR Imaging and Autofocus Algorithm in Structured Phase-Noisy Environments
IEEE Access, 2019 This paper presents a novel synthetic aperture radar (SAR) imaging and autofocus algorithm by exploiting the clustering property of the sparse scene in structured phase-noisy environments.
Yue Yang +3 more
doaj +1 more source
Joint sparsity-driven inversion and model error correction for radar imaging [PDF]
, 2009 Solution of inverse problems in imaging requires the use of a mathematical model of the observation process. However such models often involve errors and uncertainties themselves. The application of interest in this paper is synthetic aperture radar (SAR)
Cetin, Mujdat +3 more
core +2 more sources
Coordinated oscillations in cortical actin and Ca2+ correlate with cycles of vesicle secretion. [PDF]
, 2012 The actin cortex both facilitates and hinders the exocytosis of secretory granules. How cells consolidate these two opposing roles was not well understood. Here we show that antigen activation of mast cells induces oscillations in Ca(2+) and PtdIns(4,5)P(
Meyer, T, Wollman, R
core +1 more source
Through-the-Wall SAR Auto-Focusing With Low Accuracy Positioning System
IEEE AccessThis paper analyzes a through-the-wall synthetic aperture radar (SAR) imaging system designed for indoor use with imprecise positioning systems. Due to uncertainties in transceiver positions at scanning timestamps and the defocusing effects caused by ...
Adrian Focsa +3 more
doaj +1 more source
A Modified Iteration-Free SPGA Based on Removing the Linear Phase
Remote Sensing, 2023 In traditional Stripmap SAR imaging, the platform motion error will bring the phase error in the azimuthal direction to the image, which will have a series of effects on the imaging quality.
Yi Xie +3 more
doaj +1 more source