Iowa State University
Orthogonally coded MIMO array for Ka-band (26.5 - 40 GHz) millimeter-wave imaging
Abstract
dc:description.abstractThis 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.
Degree
thesis:*- Name thesis:degree_name
- Master of Science
- Level thesis:degree_level
- thesis
- Discipline thesis:degree_discipline
- Engineering
- Department dc:contributor.department
- Department of Electrical and Computer Engineering
- Grantor
- Iowa State University
- Year dc:date.issued
- 2025
Author and committee
dc:creator, dc:contributor.*- Author dc:creator
-
- Caron, Matthew
- Advisors dc:contributor.advisor
-
- Al Qaseer, Mohammad Tayeb
- Hornbuckle, Brian
- Zoughi, Reza
Rights
- Language dc:language.iso
- en
Identifiers
dc:identifier.*- OAI identifier oai:identifier
- oai:dr.lib.iastate.edu:20.500.12876/gwW7a7jw