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AuthorHasch, Jü
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AbstractNext-generation radar sensors require imaging capabilities with high angular resolution. As for a single sensor, the aperture, and thus the achievable resolution, is limited due to the constraints of the front end, radar networks consisting of multiple sensors are a possible solution. However, their incoherency usually makes joint angle estimation impossible. This article presents a network concept consisting of an orthogonal frequency-division multiplexing (OFDM) radar and repeater elements, which receive the reflections from targets and retransmit them back to the radar. Thereby, any frequency conversion from radio frequency to baseband and vice versa is omitted such that the signal remains coherent to the initial transmit signal. To distinguish the bistatic signal transmitted by the repeater from the monostatic one of the OFDM radar, the orthogonal subcarrier structure of OFDM waveforms is exploited by combining a sparse radar transmit signal with a low-frequency modulation in the repeater. This allows to evaluate the bistatic signals at the radar with standard multiple-input-multiple-output (MIMO)-OFDM signal processing, leading to separate range-Doppler images for each virtual channel. Finally, it is shown that this method offers a coherent angular estimation based on the extended aperture of the network. For this purpose, a method to establish phase coherency by a reconstruction of the modulation phase is presented. The network concept is proved with measurements at 77 GHz.dc.description.abstract
PublisherUniversität Ulmdc.publisher
LicenseCC BY 4.0 Internationaldc.rights
Link to license text
Keywordangle estimationdc.subject
Keyworddirection of arrival (DoA)dc.subject
KeywordOFDM-MIMO radardc.subject
Keywordphase reconstructiondc.subject
Keywordphase recoverydc.subject
Keywordradar networkdc.subject
Dewey Decimal GroupDDC 620 / Engineering & allied operationsdc.subject.ddc
LCSHBistatic radardc.subject.lcsh
LCSHCoherent radardc.subject.lcsh
LCSHMIMO systemsdc.subject.lcsh
LCSHOrthogonal frequency division multiplexingdc.subject.lcsh
TitleOFDM-based radar network providing phase coherent DOA estimationdc.title
Resource typeWissenschaftlicher Artikeldc.type
GNDBistatisches Radardc.subject.gnd
FacultyFakultät für Ingenieurwissenschaften, Informatik und Psychologieuulm.affiliationGeneral
InstitutionInstitut für Mikrowellentechnikuulm.affiliationSpecific
Peer reviewjauulm.peerReview
DCMI TypeTextuulm.typeDCMI
In cooperation withRobert Bosch GmbHuulm.cooperation
DOI of original publication10.1109/TMTT.2020.3026041dc.relation1.doi
Source - Title of sourceIEEE Transactions on Microwave Theory and Techniquessource.title
Source - Place of publicationInstitute of Electrical and Electronics Engineerssource.publisher
Source - Volume2020source.volume
Source - Year2020source.year
Source - ISSN0018-9480source.identifier.issn
Source - eISSN1557-9670source.identifier.eissn
University Bibliographyjauulm.unibibliographie

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CC BY 4.0 International
Except where otherwise noted, this item's license is described as CC BY 4.0 International