Results 241 to 250 of about 2,700,967 (284)

Back-Projection Tomography with Polarimetric HoloSAR data and Sub-aperture Processing

IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium, 2022
Digital surface models (DSMs) are sets of elevation data of the Earth's surface useful for urban studies representing height estimation of buildings. They can be derived from a set of synthetic aperture radar (SAR) images acquired in an interferometric (InSAR) or tomographic configuration (TomoSAR).
Elías Méndez Domínguez, David Small, Daniel Henke   +2 more
openaire   +2 more sources

New method of annular sub-apertures stitching

SPIE Proceedings, 2009
Annular sub-apertures stitching technology is a feasible method for testing asphere without assistant equipment. The overlap area of two annular sub-apertures is needed to sample in traditional stitching way. The size of overlap area influences the accuracy and efficiency of annular sub-apertures stitching, since small area will deduce the error of ...
Yun Su, Kai Wang, Ningjuan Ruan, Bo Li
openaire   +1 more source

Phase coherence factor with sub-aperture beamforming

2014 IEEE International Ultrasonics Symposium, 2014
High-frame-rate echocardiography using unfocused transmit beams and parallel receive beamforming is a promising method for evaluation of cardiac function, such as imaging of rapid propagation of the heart wall vibration. In this technique, high temporal resolution is realized at the expense of spatial resolution and contrast. The phase coherence factor
Hideyuki Hasegawa, Hiroshi Kanai
openaire   +1 more source

Error analysis of sub-aperture stitching interferometry

SPIE Proceedings, 2012
Large-aperture optical elements are widely employed in high-power laser system, astronomy, and outer-space technology. Sub-aperture stitching is an effective way to extend the lateral and vertical dynamic range of a conventional interferometer. With the aim to provide the accuracy of equipment, this paper simulates the arithmetic to analyze the errors.
Xin Jia, Fuchao Xu, Weimin Xie, Tingwen Xing   +3 more
openaire   +1 more source

Corrective, deterministic, and/or generative sub-aperture finishing

SPIE Proceedings, 2010
Sub-aperture finishing is applied for the correction of the optical surface. Most important issue is how to keep stabilized sub-aperture tool contact (footprint) condition and control a removal rate and a dwell time. Magneto Rheological Finishing is one of the most advanced sub-aperture finishing process. For several years, this process was applied
Ken Tanimura, Kazuto Hori, Noboru Sugimoto, Toshihide Dohi   +3 more
openaire   +1 more source

An analysis of three applications for an EHF sub-aperture

2006 IEEE Antennas and Propagation Society International Symposium, 2006
There has been significant recent interest in the application of MMW and submillimeter wave technology to develop imaging systems that can "see" though either adverse weather environments or through materials such as clothing or baggage. This paper describes elements of a study of three system applications and a definition of a common sub-aperture ...
H.B. Wallace, M.J. Rosker
openaire   +1 more source

DOA and Doppler Frequency Estimation Based on Sub-aperture MUSIC

IFAC Proceedings Volumes, 2013
Abstract Most available algorithms for DOA estimation in monostatic MIMO radar involve the computation of covariance matrix and its inversion or eigendecomposition, of which the computational complexity is expensive, especially in the case that both the number of sensors and snapshots are large.
Xiaoli Liu, Guisheng Liao
openaire   +2 more sources

Sub-aperture Behavior of SAR Signatures of Ships

2006 IEEE International Symposium on Geoscience and Remote Sensing, 2006
The SAR signatures of ships in separate sub-apertures are investigated in two RADARSAT images. It is found that in most cases there is a low correlation between the sub-apertures. Several alternative combinations of three sub-apertures, other than the usual multi-look average, are investigated for their ship detection performance on an image with ...
openaire   +1 more source

MEGARA Optics: Sub-aperture Stitching Interferometry for Large Surfaces

Publications of the Astronomical Society of the Pacific, 2018
In this work, we present a detailed analysis of sub-aperture interferogram stitching software to test circular and elliptical clear apertures with diameters and long axes up to 272 and 180 mm, respectively, from the Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía (MEGARA). MEGARA is a new spectrograph for the Gran Telescopio Canarias (GTC)
Aguirre-Aguirre, Daniel, Carrasco, Esperanza, Izazaga-Pérez, Rafael, Páez, Gonzalo, Granados-Agustín, Fermín, Percino-Zacarías, Elizabeth, Gil de Paz, Armando, Gallego, Jesús, Iglesias-Páramo, J., Villalobos-Mendoza, Brenda   +9 more
openaire   +2 more sources

Scene characterization using sub-aperture polarimetric SAR data analysis

IEEE International Geoscience and Remote Sensing Symposium, 2003
In this paper is introduced a fully polarimetric sub-aperture analysis method. A deconvolution technique is developed in order to decompose synthesized SAR images into sub-aperture data sets which correspond to the scene global response observed under different azimuthal look angles.
Ferro-Famil, Laurent, Reigber, Andreas, Pottier, Eric, Boerner, W.M.   +3 more
openaire   +2 more sources