Multistatic synthetic aperture radar autofocus for back projection imaging of a moving target

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dc.contributor.authorRattan, Anmol
dc.contributor.authorAndre, Daniel
dc.contributor.authorFinnis, Mark V.
dc.date.accessioned2025-03-28T13:58:01Z
dc.date.available2025-03-28T13:58:01Z
dc.date.freetoread2025-03-28
dc.date.issued2025-01
dc.date.pubOnline2025-03-17
dc.description.abstractSynthetic Aperture Radar (SAR) plays a vital role in the surveillance of terrestrial and maritime targets, which are commonly in motion. As such, the ability to perform accurate real‐time focusing and localisation on moving targets, particularly those moving with complex motion, is desired. Many existing autofocus algorithms struggle to achieve this and rely on sub‐aperture processing of SAR data to estimate and compensate for phase errors attributed to unknown target motion. This paper presents a new metric‐based autofocus approach, called Localised Threshold Sharpness (LTS), which employs multistatic SAR data to localise and focus a target moving with up to six degrees of freedom motion on a real‐time, pulse‐by‐pulse basis. The algorithm is verified with experimental data, and its performance is compared against the performance of an existing measure of image sharpness suitable for pulse‐by‐pulse autofocusing, namely the intensity‐squared metric, with varying levels of added noise. Normalised cross‐correlation results demonstrate a resemblance of at least 80% between Multistatic SAR images focused via LTS autofocus and Multistatic SAR images ideally focused using target motion knowledge for signal‐to‐noise ratios above 3 dB.
dc.description.journalNameElectronics Letters
dc.description.sponsorshipThis work was funded by Defence Science and Technology Laboratory.
dc.identifier.citationRattan A, Andre D, Finnis M. (2025) Multistatic synthetic aperture radar autofocus for back projection imaging of a moving target. Electronics Letters, Volume 61, Issue 1, January/December 2025, Article number e70217
dc.identifier.eissn1350-911X
dc.identifier.elementsID567155
dc.identifier.issn0013-5194
dc.identifier.issueNo1
dc.identifier.paperNoe70217
dc.identifier.urihttps://doi.org/10.1049/ell2.70217
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/23690
dc.identifier.volumeNo61
dc.languageEnglish
dc.language.isoen
dc.publisherInstitution of Engineering and Technology (IET)
dc.publisher.urihttps://ietresearch.onlinelibrary.wiley.com/doi/10.1049/ell2.70217
dc.rightsAttribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subject4013 Geomatic Engineering
dc.subject40 Engineering
dc.subjectElectrical & Electronic Engineering
dc.subject4006 Communications engineering
dc.subject4009 Electronics, sensors and digital hardware
dc.subjectmotion compensation
dc.subjectmotion estimation
dc.subjectradar imaging
dc.subjectradar target recognition
dc.subjectsonar and navigation
dc.subjectsynthetic aperture radar
dc.subjecttarget tracking
dc.titleMultistatic synthetic aperture radar autofocus for back projection imaging of a moving target
dc.typeArticle
dcterms.dateAccepted2025-03-05

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