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Special Issue "Modern Radar Systems"

A special issue of Sensors (ISSN 1424-8220). This special issue belongs to the section "Remote Sensors".

Deadline for manuscript submissions: 31 August 2021.

Special Issue Editors

Prof. Dr. Piotr Samczynski
E-Mail Website1 Website2
Guest Editor
Politechnika Warszawska, Warsaw University of Technology, 00-661 Warszawa, Poland
Interests: SAR/ISAR; passive radars; passive SAR/ISAR; noise radars; radar signal processing
Special Issues and Collections in MDPI journals
Prof. Dr. Daniel W. O'Hagan
E-Mail Website
Guest Editor
Fraunhofer Institute for High Frequency Physics and Radar Techniques FHR, Wachtberg, Germany
Interests: Passive Radar, Mulitstatic, Cooperative Bi-/Multi-Static Radar, MFRFS, Next Generation Waveforms, Platform Sychronisation
Dr. Jacek Misiurewicz
E-Mail Website1 Website2
Guest Editor
Faculty of Electronics and Information Technology, Warsaw University of Technology, 00-665 Warsaw, Poland
Interests: signal processing; non-uniform sampling in radar; compressed sensing; noise and passive radar technology;radar resource management; track before detect techniques
Special Issues and Collections in MDPI journals
Dr. Lorenzo Lo Monte
E-Mail Website
Guest Editor
Telephonics
Interests: applied RF/radar/EW systems engineering; prototyping; teaching; consulting and research; esign of AESAs, microwave devices and signal processors; algorithm development for AMTI, ASW, ASuW, BMD, CCD, DMTI, EA, EP, EMW, ES, GMTI, GPR, ISAR, In-SAR, MIMO, MMTI, SAR, SAA, STAP

Special Issue Information

Dear Colleagues,

In recent years, developments in radar have intensified, with an increasing convergence of active and passive technology applied in numerous fields. The development of radar was originally for military purposes; however, radar has recently become a prominent technology in a wide variety of civil applications, such as automotive radars, human detection and classification, ground-penetrating radars, and medical imaging radars, among others. In most radar applications, there is still a need for faster and more accurate signal processing methods to enhance detection, localization, tracking, data fusion, imaging, and target classification. Furthermore, there is greater demand for sophisticated system design so that radar functionality may operate in unison with other sensor techniques.  

The aim of this Special Issue is to present the latest research results in the area of modern radar technology utilizing active and/or passive radar sensor systems in different applications, including both military use and a broad spectrum of civilian applications. The contributions from leading experts in this field of research will be collected and presented in this Special Issue.  

This Special Issue aims to highlight the advances in modern radar systems. Topics include but are not limited to:

  • Modern solutions in radar systems;
  • Deployable multiband passive/active radars;
  • New applications in passive radars;
  • New techniques in radar signal processing;
  • Waveform design techniques in radar applications;
  • Active and Passive SAR/ISAR imaging techniques;
  • Civilian applications of modern radar technology;
  • Radar signal and data processing;
  • Tracking and data fusion;
  • Multifunctional RF Systems (MFRFS);
  • Radar network synchronization;
  • Countermeasures to modern radar.
Dr. Piotr Samczynski
Dr. Daniel W. O'Hagan
Dr. Jacek Misiurewicz
Dr. Lorenzo Lo Monte
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Sensors is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2200 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (8 papers)

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Open AccessArticle
Effects of Movement for High Time-Bandwidths in Batched Pulse Compression Range-Doppler Radar
Sensors 2021, 21(7), 2492; https://doi.org/10.3390/s21072492 - 03 Apr 2021
Viewed by 357
Abstract
Radar detection and track building performance is an essential part of a radar system. A high realized coherent integration gain often contributes to an improved performance. This is essential to the successful detection and tracking of weak moving targets. However, the actual movement [...] Read more.
Radar detection and track building performance is an essential part of a radar system. A high realized coherent integration gain often contributes to an improved performance. This is essential to the successful detection and tracking of weak moving targets. However, the actual movement within the coherent processing interval can introduce range walk effects. The processing will then result in range and Doppler frequency resolutions that become finer than a single moving point scatterer’s spread over range and—often not considered—over Doppler frequency. In particular for a wide instantaneous bandwidth, the impact on the achievable integration gain can become severe already for a constant effective velocity. Therefore, high desired integration gains as required in passive radar are not easily achieved against relatively fast moving targets. The main intent of this article is to present the movement effects on a classical range-Doppler analysis to give an insight on the achievable performance and to quantify otherwise appearing degradations. Interestingly, a classical analysis of experimental datasets evaluated from a DVB-T based passive radar measurement campaign even resolved the fluctuation of a target response within the instantaneously processed bandwidth. The findings strengthen the need for advanced processing methods that can at least partly address individual implications of fast moving targets in real-time applications properly. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessArticle
Advancing Ground-Based Radar Processing for Bridge Infrastructure Monitoring
Sensors 2021, 21(6), 2172; https://doi.org/10.3390/s21062172 - 20 Mar 2021
Viewed by 428
Abstract
In this study, we further develop the processing of ground-based interferometric radar measurements for the application of bridge monitoring. Applying ground-based radar in such complex setups or long measurement durations requires advanced processing steps to receive accurate measurements. These steps involve removing external [...] Read more.
In this study, we further develop the processing of ground-based interferometric radar measurements for the application of bridge monitoring. Applying ground-based radar in such complex setups or long measurement durations requires advanced processing steps to receive accurate measurements. These steps involve removing external influences from the measurement and evaluating the measurement uncertainty during processing. External influences include disturbances caused by objects moving through the signal, static clutter from additional scatterers, and changes in atmospheric properties. After removing these influences, the line-of-sight displacement vectors, measured by multiple ground-based radars, are decomposed into three-dimensional displacement components. The advanced processing steps are applied exemplarily on measurements with two sensors at a prestressed concrete bridge near Coburg (Germany). The external influences are successfully removed, and two components of the three-dimensional displacement vector are determined. A measurement uncertainty of less than 0.1 mm is achieved for the discussed application. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessArticle
Experimental Verification of the Concept of Using LOFAR Radio-Telescopes as Receivers in Passive Radiolocation Systems
Sensors 2021, 21(6), 2043; https://doi.org/10.3390/s21062043 - 14 Mar 2021
Viewed by 470
Abstract
The paper presents a new idea of using a low-frequency radio-telescope belonging to the LOFAR network as a receiver in a passive radar system. The structure of a LOFAR radio-telescope station is described in the context of applying this radio-telescope for detection of [...] Read more.
The paper presents a new idea of using a low-frequency radio-telescope belonging to the LOFAR network as a receiver in a passive radar system. The structure of a LOFAR radio-telescope station is described in the context of applying this radio-telescope for detection of aerial (airplanes) and space (satellite) targets. The theoretical considerations and description of the proposed signal processing schema for the passive radar based on a LOFAR radio-telescope are outlined in the paper. The results of initial experiments verifying the concept of a LOFAR station use as a receiver and a commercial digital radio broadcasting (DAB) transmitters as illuminators of opportunity for aerial object detection are presented. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessArticle
Experimental Comparison of Radon Domain Approaches for Resident Space Object’s Parameter Estimation
Sensors 2021, 21(4), 1298; https://doi.org/10.3390/s21041298 - 11 Feb 2021
Viewed by 439
Abstract
The fast and uncontrolled rise of the space objects population is threatening the safety of space assets. At the moment, space awareness solutions are among the most calling research topic. In fact, it is vital to persistently observe and characterize resident space objects. [...] Read more.
The fast and uncontrolled rise of the space objects population is threatening the safety of space assets. At the moment, space awareness solutions are among the most calling research topic. In fact, it is vital to persistently observe and characterize resident space objects. Instrumental highlights for their characterization are doubtlessly their size and rotational period. The Inverse Radon Transform (IRT) has been demonstrated to be an effective method for this task. The analysis presented in this paper has the aim to compare various approaches relying on IRT for the estimation of the object’s rotation period. Specifically, the comparison is made on the basis of simulated and experimental data. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessArticle
Clutter-Masked Waveform Design for LPI/LPD Radarcom Signal Encoding
Sensors 2021, 21(2), 631; https://doi.org/10.3390/s21020631 - 18 Jan 2021
Viewed by 355
Abstract
In this work we propose a method of in situ clutter deconvolution and modeling using experimentally obtained UWB radar data. The obtained clutter models are then used for random sequence encoding of radar-communication (radarcom) signals to achieve clutter-masked transmissions and improve communication security. [...] Read more.
In this work we propose a method of in situ clutter deconvolution and modeling using experimentally obtained UWB radar data. The obtained clutter models are then used for random sequence encoding of radar-communication (radarcom) signals to achieve clutter-masked transmissions and improve communication security. We present the results of clutter modeling from the laboratory data obtained with the software-defined radar system. We then show that such clutter-masked radarcom signals generated using the local clutter model are highly likely to be interpreted as just clutter returns by an unauthorized interceptor. We also present the results of communication and radar performance of these radarcom signals and contrast them with those obtained using a linear frequency modulated waveform. It is shown that the proposed radarcom design method has high potential to achieve secure communications in adversarial conditions, while simultaneously addressing radar sensing needs. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessArticle
FSR Systems for Detection of Air Objects Using Cosmic Radio Emissions
Sensors 2021, 21(2), 465; https://doi.org/10.3390/s21020465 - 11 Jan 2021
Viewed by 369
Abstract
The paper analyses the possibility of Forward Scatter Radar (FSR) systems to detect airplanes using cosmic emission from pulsars and planets (pulsar, Sun, Moon). A suboptimal multichannel algorithm for joint detection and evaluation of the parameters of the forward scattering signal created by [...] Read more.
The paper analyses the possibility of Forward Scatter Radar (FSR) systems to detect airplanes using cosmic emission from pulsars and planets (pulsar, Sun, Moon). A suboptimal multichannel algorithm for joint detection and evaluation of the parameters of the forward scattering signal created by an airplane (duration and velocity) is proposed, with preliminary compensation of the powerful direct signal emitted by cosmic sources (pulsar, Sun and Moon). The expressions for calculation of the Signal-to-Noise Ratio (SNR) at the input of the detector and the compensator are obtained. The detection characteristics are also obtained, and the requirements for the suppression coefficient of the compensator are evaluated. A methodology for calculating the maximum distance for detecting an aircraft using a described algorithm is proposed. The obtained results show that due to the Forward Scatter (FS) effect, there is the theoretical possibility to detect airplanes at close ranges by FSRs, which use very weak signals from cosmic sources. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessArticle
Detection of Low RCS Supersonic Flying Targets with a High-Resolution MMW Radar
Sensors 2020, 20(11), 3284; https://doi.org/10.3390/s20113284 - 09 Jun 2020
Cited by 2 | Viewed by 779
Abstract
In this study, the detection of a low radar cross-section (RCS) target moving at a very high speed using a high-resolution millimeter-wave radar is presented. This real-time detection is based on the transmission of a continuous wave and heterodyning of the received signal [...] Read more.
In this study, the detection of a low radar cross-section (RCS) target moving at a very high speed using a high-resolution millimeter-wave radar is presented. This real-time detection is based on the transmission of a continuous wave and heterodyning of the received signal reflected from the moving target. This type of detection enables one to extract the object’s movement characteristics, such as velocity and position, while in motion and also to extract its physical characteristics. In this paper, we describe the detection of a fired bullet using a radar operating at an extremely high-frequency band. This allowed us to employ a low sampling rate which enabled the use of inexpensive and straightforward equipment, including the use of small antennas that allow velocity detection at high resolution and with low atmospheric absorption. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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Open AccessLetter
Method of Calculating Desynchronization of DVB-T Transmitters Working in SFN for PCL Applications
Sensors 2020, 20(20), 5776; https://doi.org/10.3390/s20205776 - 12 Oct 2020
Viewed by 526
Abstract
This paper presents a novel method of calculating desynchronization between transmitters working in a single frequency digital video broadcasting-terrestrial (DVB-T) network. The described method can be a useful tool for enhancing passive radar operations and improving passive coherent location (PCL) sensors to correct [...] Read more.
This paper presents a novel method of calculating desynchronization between transmitters working in a single frequency digital video broadcasting-terrestrial (DVB-T) network. The described method can be a useful tool for enhancing passive radar operations and improving passive coherent location (PCL) sensors to correct their measurements of target localization. The paper presents the problem of localizing DVB-T transmitters utilized by passive radars, and proposes a novel method based on Time Difference of Arrival (TDoA) techniques to solve the problem. The proposed technique has been validated using real signals collected by a PCL sensor receiver. The details of the experiment and extensive result analysis are also contained in this article. Full article
(This article belongs to the Special Issue Modern Radar Systems)
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