Search for: space-based-radar
Article Proceedings International Radar Symposium, 10 May 2016 through 12 May 2016 ; Volume 2016-June , 2016 ; 21555753 (ISSN) ; 9781509025183 (ISBN) ; Bayat, S ; Farina, A ; Hajsadeghian, S ; Nayebi, M. M ; Sharif University of Technology
IEEE Computer Society 2016
In this paper we present a feasibility study on using satellite signal for passive radar application. Our focus is on utilizing GEO (geostationary Earth orbit) satellite signal with suitable properties. The feasibility of using such satellite signal for passive radar application is evaluated. In particular, a space shuttle as the target of interest is considered. In addition to being covert, it will be shown that using such passive radar system, we can benefit the forward scatter enhancement, which enables us to detect such high-altitude target that is totally undetectable to conventional radar systems
Article IET Radar, Sonar and Navigation ; Volume 13, Issue 3 , 2019 , Pages 420-427 ; 17518784 (ISSN) ; Fakharzadeh, M ; Bastani, M. H ; Sharif University of Technology
Institution of Engineering and Technology 2019
Here, nadir echo suppression (NES) in synthetic aperture radar (SAR) satellites is studied in detail. Moreover, advantages of suppressing the nadir echo in space domain, by beamforming, rather than in time domain, which imposes stringent restrictions on radar timing, are addressed. Performing NES in time domain restricts the swath width, as well as the selection of the pulse repetition frequency (PRF). It is shown that the spatial NES could increase the swath width by ∼25%. It also increases the freedom in PRF selection, which is useful in multiple-swath imaging modes and high-resolution wide-swath satellites. Furthermore, it is useful in confining the operating PRF range of SAR satellites,...
Article IEEE Transactions on Instrumentation and Measurement ; Volume 70 , 2021 ; 00189456 (ISSN) ; Behnia, F ; Amiri, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc 2021
In this article, localization of a maritime target using a passive multistatic radar system, consisting of a single receiver and a number of satellites as its transmitters, is investigated. The set of communication satellites and also the global navigation satellite system (GNSS), including GPS, Glonass, and Galileo, are employed as illuminators of opportunity. In the receiver, the reflected signals from the target along with the direct signal from the satellites are employed to extract a set of bistatic range measurements. Leveraging these measurements and the satellite's position information, a novel localization method considering zero height of maritime target and appropriate combination...
Article Proceedings International Radar Symposium, 24 June 2015 through 26 June 2015 ; Volume 2015-August , 2015 , Pages 664-669 ; 21555753 (ISSN); 9783954048533 (ISBN); 9783954048533 (ISBN); 9783954048533 (ISBN) ; Bagheri, A. M ; Azarbar, A ; Nayebi, M. M ; Rohling H ; Rohling H ; Rohling H ; Sharif University of Technology
IEEE Computer Society 2015
In CW forward scatter radars, Space-Time processing by 2-D FFT is used to estimate Doppler frequency shift and angle of arrival concurrently. 2-D periodogram and 2-D Capon methods are two famous spectral estimation methods which can be substituted for 2-D FFT. Here we will provide analysis of performance for these methods beside their cons and pros
Article Signal, Image and Video Processing ; Volume 11, Issue 3 , 2017 , Pages 565-572 ; 18631703 (ISSN) ; Bayat, S ; Farina, A ; Hajsadeghian, S ; Nayebi, M. M ; Sharif University of Technology
Springer London 2017
This paper presents a feasibility study on using satellite signal for passive radar application. Our focus is on utilizing geostationary Earth orbit satellite signal with suitable properties, like Inmarsat. Then, a new method of detection for passive coherent location using adaptive filter weights variation model is presented. To evaluate the performance, three different scenarios including a low Earth orbit satellite, a space shuttle, and a high-altitude aircraft as the targets of interest are considered. In addition to being covert, it will be shown that using such passive radar system, we can benefit the forward scatter enhancement, which enables us to detect such high-altitude targets...
Fast fourier-based implementation of synthetic aperture radar algorithm for multistatic imaging system, Article IEEE Transactions on Instrumentation and Measurement ; 2018 ; 00189456 (ISSN) ; Shayei, A ; Shabany, M ; Kavehvash, Z ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc 2018
Multistatic millimeter-wave imaging structures are superior to their monostatic counterparts for imaging natural objects of sudden profile variations. Multistatic image reconstruction is conventionally performed via synthetic aperture radar (SAR)-based methods which, in spite of their high accuracy, are computationally burdensome. On the other side, the Fourier-based image reconstruction in multistatic systems also faces few challenges including multidimensional interpolation, a plane-wave approximation of spherical waves, and k-space partitioning. This paper presents a fast implementation of the SAR-based image reconstruction method in case of 1-D and 2-D multistatic arrays. The proposed...
Article IEEE Transactions on Aerospace and Electronic Systems ; Volume 55, Issue 5 , 2019 , Pages 2327-2336 ; 00189251 (ISSN) ; Norouzi, Y ; Kashani, E. S ; Nayebi, M. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc 2019
In this study, a new passive method suitable for geolocating low probability of intercept (LPI) radars is introduced. The method uses two electronic support receivers placed on a fast moving platform (e.g., an airplane or a satellite). The proposed method has a high processing gain, which makes it highly suitable for very weak LPI signals. The method processing gain was analytically derived and illustrated with simulation to determine if the proposed method can detect LPI radars in much lower SNRs compared to regular time-frequency LPI detection methods. Also, the resolution of the proposed method in both range and cross-range directions in radar location finding was analyzed. The results...
Particle filtering-based low-elevation target tracking with multipath interference over the ocean surface, Article IEEE Transactions on Aerospace and Electronic Systems ; Volume 56, Issue 4 , 2020 , Pages 3044-3054 ; Taheri, A ; Cecen, T ; Celik, N ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc 2020
As radar signals propagate above the ocean surface to determine the trajectory of a target, the signals that are reflected directly from the target arrive at the receiver along with indirect signals reflected from the ocean surface. These unwanted signals must be properly filtered; otherwise, their interference may mislead the signal receiver and significantly degrade the tracking performance of the radar. To this end, we propose a low-elevation target tracking mechanism considering the specular and diffuse reflection effects of multipath propagation over the ocean surface simultaneously. The proposed mechanism consists of a state-space model and a particle filtering algorithm and promises...
Knowledge-based design of space-time transmit code and receive filter for a multiple-input-multiple-output radar in signal-dependent interference, Article IET Radar, Sonar and Navigation ; Volume 9, Issue 8 , 2015 , Pages 1124-1135 ; 17518784 (ISSN) ; Aubry, A ; Carotenuto, V ; Naghsh, M. M ; Bastani, M. H ; Sharif University of Technology
Institution of Engineering and Technology 2015
The authors deal with the robust design of multiple-input-multiple-output (MIMO) space-time transmit code (STTC) and space-time receive filter (STRF) for a point-like target embedded in signal-dependent interference. Specifically, they assume that the radar exploits knowledge provided by dynamic environmental database, to roughly predict the actual scattering scenario. Then, they devise an iterative method to optimise the (constrained) STTC and the (constrained) STRF which sequentially improves the worst-case (over interfering scatterers statistics) signal-to-interference-plus-noise ratio (SINR). Each iteration of the algorithm is handled via solving two (hidden) convex optimisation...