Aperture-synthesis radar imaging with compressive sensing for ionospheric research

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dc.contributor.authorHysell, D. L.
dc.contributor.authorSharma, P.
dc.contributor.authorUrco, M.
dc.contributor.authorMilla, Marco
dc.date.accessioned2019-09-11T13:50:24Z
dc.date.available2019-09-11T13:50:24Z
dc.date.issued2019-06
dc.description.abstractInverse methods involving compressive sensing are tested in the application of two-dimensional aperture-synthesis imaging of radar backscatter from field-aligned plasma density irregularities in the ionosphere. We consider basis pursuit denoising, implemented with the fast iterative shrinkage thresholding algorithm, and orthogonal matching pursuit (OMP) with a wavelet basis in the evaluation. These methods are compared with two more conventional optimization methods rooted in entropy maximization (MaxENT) and adaptive beamforming (linearly constrained minimum variance or often “Capon's Method.”) Synthetic data corresponding to an extended ionospheric radar target are considered. We find that MaxENT outperforms the other methods in terms of its ability to recover imagery of an extended target with broad dynamic range. Fast iterative shrinkage thresholding algorithm performs reasonably well but does not reproduce the full dynamic range of the target. It is also the most computationally expensive of the methods tested. OMP is very fast computationally but prone to a high degree of clutter in this application. We also point out that the formulation of MaxENT used here is very similar to OMP in some respects, the difference being that the former reconstructs the logarithm of the image rather than the image itself from basis vectors extracted from the observation matrix. MaxENT could in that regard be considered a form of compressive sensing.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationHysell, D. L., Sharma, P., Urco, M. & Milla, M. A. (2019). Aperture‐synthesis radar imaging with compressive sensing for ionospheric research.==$Radio Science, 54$==(6), 503-516. https://doi.org/10.1029/2019RS006805es_ES
dc.identifier.doihttps://doi.org/10.1029/2019RS006805es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalRadio Sciencees_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/4694
dc.language.isoenges_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.ispartofurn:issn:0048-6604
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectIonospheric irregularitieses_ES
dc.subjectImaginges_ES
dc.subjectCompressive sensinges_ES
dc.subjectCoherent scatteres_ES
dc.subjectInverse methodses_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.01es_ES
dc.titleAperture-synthesis radar imaging with compressive sensing for ionospheric researches_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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