NDLI: Radar imaging using pseudo-coherent marine radar technology

Content Provider	IET Digital Library
Author	Aljohani, Mansour Mrebit, Abdulmajid Monte, Lorenzo Lo Wicks, Michael C.
Abstract	Magnetron-based marine radar technology is mature, affordable, reliable, and very effective for maritime safety applications. Commercial systems may be procured at a modest cost as compared to fully coherent solid-state systems. Magnetron oscillators inherently generate random phase signals. Phase instability on a pulse-to-pulse basis impedes this class of marine radars from success in applications requiring coherency such as moving target indication (MTI) or in generating target imagery. This limitation may be overcome by incorporating radio frequency sampling and cross-correlation of the transmit and receive signal technology to augment the current capability of available systems. In this research, the pulse train on transmit and receive is correlated in order to reject interference and detect image targets. Sampling the transmit signal and target echo on receive permits fully coherent processing. Marine radars traditionally operate non-coherently, and as such, offer limited surveillance in clutter rich environments. In this study, the authors report on a non-coherent marine radar that has been modified to produce a pseudo-coherent or coherent-on-receive sensor system. This is crucial to MTI and target image formation. In laboratory experiments, they employed a magnetron oscillator-based system to generate an inverse synthetic aperture radar image. The image was formed using four different algorithms: filtered back-projection (FBP), time domain back-projection (TDBP), an algebraic reconstruction technique, and frequency domain back-projection. In their research, TDBP produces exquisite imagery of steel rods, and it is the standard developed in this study. FBP performed poorly as compared to all other algorithms.
Starting Page	905
Ending Page	916
Page Count	12
ISSN	17518784
Volume Number	14
e-ISSN	17518792
Issue Number	Issue 6, Jun (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/14/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2019.0154
Journal	IET Radar, Sonar & Navigation
Publisher Date	2020-02-18
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Algebraic Reconstruction Technique Cross-correlation FBP Filtered Back-projection Frequency Domain Back-projection Fully Coherent Solid-state System Image Formation Image Reconstruction Image Sampling Inverse Synthetic Aperture Radar Image Magnetron Oscillator Magnetron Oscillator-based System Magnetron-based Marine Radar Technology Magnetrons Marine Radar Marine Radars Maritime Safety Application Mathematical Analysis Microwave Tubes Moving Target Indication MTI Noncoherent Marine Radar Optical, Image And Video Signal Processing Oscillator Phase Instability Pseudocoherent Marine Radar Technology Pulse Train Pulse-to-pulse Basis Radar Clutter Radar Equipment Radar Imaging Radar Receiver Radar Transmitters Radiofrequency Sampling Random Phase Signal Search Radar Sensor System Signal Technology System And Application TDBP Time Domain Back-projection Time-frequency Analysis
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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