ORCID Profile
0000-0002-1415-3564
Current Organisation
University of Tasmania
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Publisher: American Geophysical Union (AGU)
Date: 10-2008
DOI: 10.1029/2007RS003731
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2006
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2010
Publisher: IEEE
Date: 2006
Publisher: IEEE
Date: 2006
Publisher: IEEE
Date: 08-2011
Publisher: Informa UK Limited
Date: 2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2023
Publisher: IEEE
Date: 12-2009
Publisher: IEEE
Date: 03-2012
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2026
Publisher: IEEE
Date: 12-2008
Publisher: IOP Publishing
Date: 16-03-2018
Publisher: MDPI AG
Date: 16-08-2023
DOI: 10.3390/S23167202
Abstract: At microwave frequencies, radar cross-section (RCS) measurements are usually performed by placing the target in the far-field region of the antenna. The wavefront of the radiating field from the antenna can be approximated as planar, ensuring that the incident field and the power interact with the target independently of the antenna. However, for electrically large targets, the required distance becomes significant, posing challenges for implementation. Scaled-model RCS measurements offer an alternative solution. RCS measurements at terahertz and optical frequencies typically require a collimated beam as the source, where the intercepted power and RCS become dependent on the excitation. To address this dependency, researchers have proposed modifying the RCS definition to account for the intercepted power and to analytically formulate the scattering problem. However, such modifications require prior knowledge of the target’s geometry and material properties, which are often not readily available in practice. This also limits the study to only canonical targets. In this paper, we propose an alternative approach for modelling the intercepted power. The Gaussian beam is decomposed into a number of plane waves travelling to different directions using the theory of plane wave spectrum. The scattering problem is solved using the full-wave method of moment. Through theoretical proofs and numerical ex les involving spheres and a non-canonical target, with a scaled-model aircraft, we demonstrate that the original RCS definition can serve as a good approximation for scaled measurements, provided that the beam waist is approximately four times the target’s dimensions. These findings provide valuable guidelines for radar engineers when performing scaled measurements using collimated beams. The results, which match those obtained from full-model measurements, enable us to predict the RCS of full-scale targets. This capability facilitates various target-related applications, such as target characterization, classification, detection, and even recognition.
Publisher: The Electromagnetics Academy
Date: 2011
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2008
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2014
Publisher: IEEE
Date: 2010
Publisher: IEEE
Date: 09-2011
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 12-2015
Publisher: IEEE
Date: 07-2010
Publisher: IEEE
Date: 11-2014
Publisher: Hindawi Limited
Date: 2010
DOI: 10.1155/2010/736701
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2007
Publisher: IEEE
Date: 2006
Publisher: IEEE
Date: 07-2010
Publisher: IEEE
Date: 2005
Publisher: IEEE
Date: 12-2014
Publisher: IEEE
Date: 12-2014
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2012
Publisher: IEEE
Date: 08-2011
Publisher: IEEE
Date: 12-2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2015
Publisher: IEEE
Date: 12-2010
Publisher: Institution of Engineering and Technology (IET)
Date: 2008
DOI: 10.1049/EL:20081708
Publisher: The Electromagnetics Academy
Date: 2010
Publisher: Hindawi Limited
Date: 2014
DOI: 10.1155/2014/295832
Publisher: IEEE
Date: 09-2012
Publisher: Hindawi Limited
Date: 2013
DOI: 10.1155/2013/104848
Abstract: Performance evaluation of direction-of-arrival (DOA) estimation algorithms has continuously drawn significant attention in the past years. Most previous studies were conducted under the situation that antenna element separation is about half wavelength in order to avoid the appearance of grating lobes. On the other hand, recent developments in wireless communications have favoured the use of portable devices that utilize compact arrays with antenna element separations of less than half wavelength. Performance evaluation of DOA estimation algorithms employing compact arrays is an important and fundamental issue, but it has not been fully studied. In this paper, the performance of the matrix pencil method (MPM) that applies to DOA estimations is investigated through Monte Carlo simulations. The results show that closely spaced emitters can be accurately resolved using linear compact array with an array aperture as small as around half wavelength.
Publisher: IEEE
Date: 2006
Publisher: IEEE
Date: 06-2007
Publisher: IEEE
Date: 04-2014
Publisher: The Optical Society
Date: 22-04-2014
DOI: 10.1364/OL.39.002629
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2009
Publisher: IEEE
Date: 07-2010
Publisher: IEEE
Date: 11-2013
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2009
Publisher: OSA
Date: 2014
Publisher: Hindawi Limited
Date: 2012
DOI: 10.1155/2012/715138
Publisher: Institution of Engineering and Technology (IET)
Date: 2004
DOI: 10.1049/EL:20040328
Publisher: IEEE
Date: 12-2008
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2009
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 08-2012
Publisher: Institution of Engineering and Technology (IET)
Date: 10-2015
DOI: 10.1049/EL.2015.2878
Publisher: IEEE
Date: 06-2007
Publisher: IEEE
Date: 06-2007
Publisher: IEEE
Date: 12-2008
Publisher: IEE
Date: 2007
DOI: 10.1049/CP:20070624
Publisher: IEEE
Date: 06-2007
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 05-2008
Publisher: IEEE
Date: 12-2007
Publisher: Hindawi Limited
Date: 2012
DOI: 10.1155/2012/582037
Abstract: Microwave imaging for breast cancer detection has been of significant interest for the last two decades. Recent studies focus on solving the imaging problem using an inverse scattering approach. Efforts have mainly been focused on the development of the inverse scattering algorithms, experimental setup, antenna design and clinical trials. However, the success of microwave breast imaging also heavily relies on the quality of the forward data such that the tumor inside the breast volume is well illuminated. In this work, a numerical study of the forward scattering data is conducted. The scattering behavior of simple breast models under different polarization states and aspect angles of illumination are considered. Numerical results have demonstrated that better data contrast could be obtained when the breast volume is illuminated using cross-polarized components in linear polarization basis or the copolarized components in the circular polarization basis.
Publisher: InTech
Date: 26-09-2018
Publisher: Institution of Engineering and Technology (IET)
Date: 2010
Publisher: IEEE
Date: 12-2013
Publisher: IEEE
Date: 08-2012
Publisher: Institution of Engineering and Technology (IET)
Date: 2010
Publisher: IEEE
Date: 07-2010
Publisher: IEEE
Date: 03-2012
Publisher: Hindawi Limited
Date: 2010
DOI: 10.1155/2010/373061
Abstract: A short review of the receiving-mutual-impedance method (RMIM) for mutual coupling compensation in direction finding applications using linear array is conducted. The differences between the conventional-mutual-impedance method (CMIM) and RMIM, as well as the three different determination methods for receiving mutual impedance (RMI), will be discussed in details. As an ex le, direction finding with better accuracies is used for demonstrating the superiority of mutual coupling compensation using RMIM.
Publisher: IOP Publishing
Date: 24-06-2019
Publisher: IEEE
Date: 2010
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 10-2012
Publisher: IEEE
Date: 07-2012
Publisher: IEEE
Date: 12-2008
Publisher: IEEE
Date: 12-2009
No related grants have been discovered for Hoi-Shun Lui.