Results 191 to 200 of about 20,927 (220)

Three-Dimensional Sparse Microwave Imaging for Brain Stroke Monitoring

12th European Conference on Antennas and Propagation (EuCAP 2018), 2018
In this paper, we consider the three-dimensional (3D) differential microwave imaging for brain stroke monitoring. Assuming that stroke causes small changes in the electromagnetic parameters of the head, we apply the Distorted Born approximation to linearize the scattering equation.
Stevanovic Marija Nikolic, Scapaticci Rosa, Crocco Lorenco   +2 more
openaire   +2 more sources

Sparse microwave breast imaging with differently polarized arrays

2016 24th European Signal Processing Conference (EUSIPCO), 2016
We investigate the role of polarization in sparse differential microwave imaging for the breast-cancer localization. We consider two types of antenna arrays, placed around realistic inhomogeneous breast models. In the first case, the antennas are vertical with respect to the chest wall, whereas in the second case, the antennas are located in the ...
Marija Nikolic Stevanovic, Jelena Dinkic, Jasmin Music, Arye Nehorai   +3 more
openaire   +1 more source

Higher Order Sparse Microwave Imaging of PEC Scatterers

IEEE Transactions on Antennas and Propagation, 2016
In this paper, we present an innovative algorithm for sparse imaging of perfect electric conducting (PEC) targets. The algorithm is based on higher order sources or multipoles, rather than zero-order ones as in the standard sparse imaging. We demonstrate that, due to the directivity of higher order sources, the imaging capabilities of the algorithm are
Stevanovic Marija Nikolic, Crocco Lorenzo, Djordjevic Antonije R, Nehorai Arye   +3 more
openaire   +1 more source

Microwave synthetic aperture radar imaging using sparse measurement

2016 IEEE International Instrumentation and Measurement Technology Conference Proceedings, 2016
This paper evaluates Compressed Sensing (CS) techniques for image recovery from sparse measurement of wideband microwave synthetic aperture radar. A specimen under test (SUT) consists of a tray of small rocks of different densities and with/without one piece that is wrapped in aluminum foil.
Xiahan Yang, Yahong Rosa Zheng, Mohammad Tayeb Ghasr, Kristen M. Donnell, Reza Zoughi   +4 more
openaire   +1 more source

NUFFT-based fast reconstruction for sparse microwave imaging

Journal of Electromagnetic Waves and Applications, 2012
Compressive sensing (CS) theory has been applied to sparse microwave imaging in many ways that provide better performance and significantly reduce the sampling rate. However, the computational complexity of reconstruction puts strict constraint on some practical applications with large-scale problems in radar imaging.
J.-H. Tian, J.-P. Sun, S.-T. Lu, Y.-P. Wang, W. Hong   +4 more
openaire   +1 more source

On the Use of Spherical Harmonics in Sparse Microwave Imaging

2020 14th European Conference on Antennas and Propagation (EuCAP), 2020
In this paper, we introduce a novel microwave imaging method using spherical harmonics and the sparse processing. As the sources of the spherical harmonics, we use the multipoles of different order. Based on theoretical considerations and as shown by numerical examples this approach is capable of retrieving concave shapes, which is particularly ...
Vojnovic Nebojsa, Stevanovic Marija Nikolic, Crocco Lorenzo   +2 more
openaire   +3 more sources

Microwave radiation imaging approach based on sparse representation

2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016
Based on sparsity or compressibility of microwave radiation images, Compressive Sensing in this paper is adopted to achieve microwave radiation imaging in order to reduce the complexity and hardware cost of the imaging system and get the image of high spatial resolution.
Xiaocheng Yang, Lurong Ding, Long Wu, Jingye Yan, Ji Wu, Lin Wu, Wentao Lv   +6 more
openaire   +1 more source

RF/Microwave Imaging of Sparse Targets in Urban Areas

IEEE Antennas and Wireless Propagation Letters, 2013
This letter deals with the localization of sparse targets in urban areas. The problem is tackled in the framework of 2-D linear inverse scattering accounting for the complexity of the scenario, and a sparse optimization scheme is exploited as an effective technique capable of providing high-resolution images.
Gennarelli G, Catapano I, Soldovieri F
openaire   +3 more sources

Reconstruction techniques for sparse multistatic linear array microwave imaging

SPIE Proceedings, 2014
Sequentially-switched linear arrays are an enabling technology for a number of near-field microwave imaging applications. Electronically sequencing along the array axis followed by mechanical scanning along an orthogonal axis allows dense sampling of a two-dimensional aperture in near real-time.
David M. Sheen, Thomas E. Hall
openaire   +1 more source

Sparse array imaging for microwave gauging by compressed sensing

IEEE Transactions on Aerospace and Electronic Systems, 2014
The reliability of microwave level gauging can be improved by radar imaging techniques. An antenna array with a large aperture must be used, in order to achieve the desired resolution. At the same time, the number of array elements is limited to only a few, which leads to ambiguities due to spatial undersampling.
Stephan Kolb, Reinhard Stolle
openaire   +1 more source