A large-range autofocus microwave photonic radar based on adaptive spatial filtering along the range direction
Sign Up to like & getrecommendations! Published in 2020 at "Optics Communications"
DOI: 10.1016/j.optcom.2020.126354
Abstract: Abstract A large-range autofocus microwave photonic radar based on adaptive spatial filtering along the range direction is proposed to achieve high-resolution imaging of the target at any distance. By firstly estimating the target distance and… read more here.
Keywords: large range; high resolution; radar; microwave photonic ... See more keywords
Efficient ISAR Autofocus Technique Using Eigenimages
Sign Up to like & getrecommendations! Published in 2017 at "IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing"
DOI: 10.1109/jstars.2016.2602378
Abstract: In this paper, we propose a new and efficient inverse synthetic aperture radar (ISAR) autofocus technique by introducing eigenimages to boost the speed of the traditional autofocus algorithms. First, a preprocessing step is applied to… read more here.
Keywords: isar autofocus; autofocus technique; traditional autofocus; autofocus ... See more keywords
An Azimuth-Variant Autofocus Scheme of Bistatic Forward-Looking Synthetic Aperture Radar
Sign Up to like & getrecommendations! Published in 2017 at "IEEE Geoscience and Remote Sensing Letters"
DOI: 10.1109/lgrs.2017.2671879
Abstract: In bistatic forward-looking synthetic aperture radar (BFSAR), conventional autofocus algorithms cannot estimate the phase errors accurately when the range walk is compensated in the azimuthal time domain. This problem stems from the influence of the… read more here.
Keywords: looking synthetic; forward looking; autofocus; azimuth variant ... See more keywords
Efficient ISAR Phase Autofocus Based on Eigenvalue Decomposition
Sign Up to like & getrecommendations! Published in 2017 at "IEEE Geoscience and Remote Sensing Letters"
DOI: 10.1109/lgrs.2017.2746758
Abstract: Phase autofocus is a key step in translational motion compensation for inverse synthetic aperture radar. From the eigenvalue decomposition (EVD) of the covariance matrix generated by the aligned range-compressed signal, eigenvectors can be obtained for… read more here.
Keywords: phase autofocus; evd; eigenvalue decomposition; autofocus ... See more keywords
AFnet and PAFnet: Fast and Accurate SAR Autofocus Based on Deep Learning
Sign Up to like & getrecommendations! Published in 2022 at "IEEE Transactions on Geoscience and Remote Sensing"
DOI: 10.1109/tgrs.2022.3217063
Abstract: Autofocus plays a key role in synthetic aperture radar (SAR) imaging, especially for high-resolution imaging. In the literature, the minimum-entropy-based algorithms (MEA) have been proven to be robust and have been widely applied in SAR.… read more here.
Keywords: pafnet fast; afnet pafnet; autofocus; deep learning ... See more keywords
Two-Dimensional Autofocus Technique Based on Spatial Frequency Domain Fragmentation
Sign Up to like & getrecommendations! Published in 2020 at "IEEE Transactions on Image Processing"
DOI: 10.1109/tip.2020.2988143
Abstract: Existing two-dimensional (2D) autofocus algorithms, exploiting the known structure of 2D phase error, lack the error estimation accuracy in the case of a low signal-to-noise ratio (SNR) due to the non-exhaustive use of the echo… read more here.
Keywords: dimensional autofocus; autofocus technique; frequency; autofocus ... See more keywords
Two-stage autofocus algorithm with filled function for synthetic aperture radar
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Applied Remote Sensing"
DOI: 10.1117/1.jrs.14.026512
Abstract: Abstract. Entropy-based parametric autofocus is commonly applied to correct the residual azimuth phase error (APE) that arises from the residual motion errors (RME) in synthetic aperture radar. However, the image’s entropy trends to a convex… read more here.
Keywords: synthetic aperture; autofocus; aperture radar; stage ... See more keywords
Optical camera with liquid crystal autofocus lens.
Sign Up to like & getrecommendations! Published in 2017 at "Optics express"
DOI: 10.1364/oe.25.029945
Abstract: A mobile phone camera with an innovative electrically tunable liquid crystal lens (TLCL) concept is demonstrated. We first report the comparative theoretical and experimental analyses of the performance of a traditional "modal control" TLCL versus… read more here.
Keywords: camera; liquid crystal; optical camera; autofocus ... See more keywords