{"id":{"repo_id":"iastate","oai_identifier":"oai:dr.lib.iastate.edu:20.500.12876/gwW7a7jw"},"canonical_url":"https://search.dev.ndltd.org/etd/iastate/oai:dr.lib.iastate.edu:20.500.12876/gwW7a7jw","repository":{"repo_id":"iastate","name":"Iowa State University","base_url":"https://dr.lib.iastate.edu/server/oai/request"},"display":{"title":"Orthogonally coded MIMO array for Ka-band (26.5 - 40 GHz) millimeter-wave imaging","abstract":"This paper introduces a multi-static millimeter wave imaging system that utilizes binary phase-shift keying (BPSK) modulation of the intermediate frequency (IF) signals with orthogonal codes, commonly called code division multiple access (CDMA). This method allows the array to distinguish the radar back-scatter for each transmitter of the imaging system when they are operated simultaneously. This simultaneous operation of the imaging system enables high-speed synthetic aperture radar imaging for non-destructive testing applications. The system utilizes an 8-by-8 array of transmitters and receivers operating at Ka-band (26.5 — 40 GHz), which are capable of irradiating a sample under test (SUT) using multiple transmitters simultaneously while allowing it to decode the power from each transmitter-receiver combination. The system was built, calibrated, tested for its efficacy in nondestructive testing. Furthermore, the impact of code length on the signal-to-noise ratio and channel orthogonality was also tested. The simulation and measurement results show that the overall signal-to-noise ratio is higher compared to systems where the channels transmit sequentially.","abstract_html":"This paper introduces a multi-static millimeter wave imaging system that utilizes binary phase-shift keying (BPSK) modulation of the intermediate frequency (IF) signals with orthogonal codes, commonly called code division multiple access (CDMA). This method allows the array to distinguish the radar back-scatter for each transmitter of the imaging system when they are operated simultaneously. This simultaneous operation of the imaging system enables high-speed synthetic aperture radar imaging for non-destructive testing applications. The system utilizes an 8-by-8 array of transmitters and receivers operating at Ka-band (26.5 — 40 GHz), which are capable of irradiating a sample under test (SUT) using multiple transmitters simultaneously while allowing it to decode the power from each transmitter-receiver combination. The system was built, calibrated, tested for its efficacy in nondestructive testing. Furthermore, the impact of code length on the signal-to-noise ratio and channel orthogonality was also tested. The simulation and measurement results show that the overall signal-to-noise ratio is higher compared to systems where the channels transmit sequentially.","abstract_has_math":false,"creators":["Caron, Matthew"],"institution":"Iowa State University","degree_name":"Master of Science","degree_level":"thesis","degree_discipline":"Engineering","degree_department":"Department of Electrical and Computer Engineering","school":null,"contributors":[],"advisors":["Al Qaseer, Mohammad Tayeb","Hornbuckle, Brian","Zoughi, Reza"],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-08","date_published":"2025-08","updated_at":"2026-07-24T02:39:07Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/td-20251215-377"],"render_values":[{"text":"https://doi.org/10.31274/td-20251215-377","href":"https://doi.org/10.31274/td-20251215-377","code":true}]}]},"links":{"outbound_url":"https://dr.lib.iastate.edu/handle/20.500.12876/gwW7a7jw","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Al Qaseer, Mohammad Tayeb","Hornbuckle, Brian","Zoughi, Reza"]},{"key":"dc:contributor.department","label":"Department","values":["Department of Electrical and Computer Engineering"]},{"key":"dc:creator","label":"Author","values":["Caron, Matthew"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-08-28T19:16:34Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-08-28T19:16:34Z"]},{"key":"dc:date.issued","label":"Date","values":["2025-08"]},{"key":"dc:type","label":"Dc Type","values":["thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Iowa State University"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.doi","label":"DOI","values":["https://doi.org/10.31274/td-20251215-377"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://dr.lib.iastate.edu/handle/20.500.12876/gwW7a7jw"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This paper introduces a multi-static millimeter wave imaging system that utilizes binary phase-shift keying (BPSK) modulation of the intermediate frequency (IF) signals with orthogonal codes, commonly called code division multiple access (CDMA). This method allows the array to distinguish the radar back-scatter for each transmitter of the imaging system when they are operated simultaneously. This simultaneous operation of the imaging system enables high-speed synthetic aperture radar imaging for non-destructive testing applications. The system utilizes an 8-by-8 array of transmitters and receivers operating at Ka-band (26.5 — 40 GHz), which are capable of irradiating a sample under test (SUT) using multiple transmitters simultaneously while allowing it to decode the power from each transmitter-receiver combination. The system was built, calibrated, tested for its efficacy in nondestructive testing. Furthermore, the impact of code length on the signal-to-noise ratio and channel orthogonality was also tested. The simulation and measurement results show that the overall signal-to-noise ratio is higher compared to systems where the channels transmit sequentially."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["PDF"]},{"key":"dc:title","label":"Title","values":["Orthogonally coded MIMO array for Ka-band (26.5 - 40 GHz) millimeter-wave imaging"]}]}],"canonical_facts":{"dc:contributor.advisor":["Al Qaseer, Mohammad Tayeb","Hornbuckle, Brian","Zoughi, Reza"],"dc:contributor.department":["Department of Electrical and Computer Engineering"],"dc:creator":["Caron, Matthew"],"dc:date.accessioned":["2025-08-28T19:16:34Z"],"dc:date.available":["2025-08-28T19:16:34Z"],"dc:date.issued":["2025-08"],"dc:description.abstract":["This paper introduces a multi-static millimeter wave imaging system that utilizes binary phase-shift keying (BPSK) modulation of the intermediate frequency (IF) signals with orthogonal codes, commonly called code division multiple access (CDMA). 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