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Ground-based moving target imaging in a circular strip-map synthetic aperture radar
, Article Proceedings of the 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2015, 1 September 2015 through 4 September 2015 ; 2015 , Pages 835-840 ; 9781467372961 (ISBN) ; Bayat, S ; Nayebi, M. M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper a novel algorithm for detection, parameter estimation, and image formation of a moving target in ground-based circular strip-map synthetic aperture radar (GBCSAR) is proposed. Because multiple similar scans of the scene with short revisit time are possible, moving target detection is performed by clutter cancellation. Despite of the frequency-domain or multi-antenna clutter cancellation methods, this system has the capability of removing the clutter completely regardless of the target speed or the signal to clutter ratio (SCR). Estimation of target parameters and range-cell migration correction (RCMC) is based on comparing two consecutive target images. Finally the azimuth...
MIMO SAR ground moving target indication via compressed sensing
, Article 26th Iranian Conference on Electrical Engineering, ICEE 2018, 8 May 2018 through 10 May 2018 ; 2018 , Pages 398-403 ; 9781538649169 (ISBN) ; Mashhadi, S ; Vahedi, P ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2018
Abstract
Synthetic aperture radar (SAR) systems are so popular in aerial imaging because of their high resolution. Ground moving target indication (GMTI) is one of the most challenging problems in this field. The use of multiple antennas in transmit and receive is an innovative idea that can overcome the limitations of SAR systems. In this paper, after modelling the received signal and focusing it, we propose an algorithm for GMTI with the use of compressed sensing. The proposed algorithm has low complexity compared to similar algorithms. Simulation results show that this approach is accurate in estimation of positions and velocities of moving targets. © 2018 IEEE
Designing a hierarchical model-predictive controller for tracking an unknown ground moving target using a 6-DOF quad-rotor
, Article International Journal of Dynamics and Control ; September , 2020 ; Badri, P ; Mohammadkhani, H ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2020
Abstract
In this paper, a hierarchical predictive controller is designed in order to solve the tracking problem of a moving ground target by a quad-rotor in an unknown and uneven environment. This controller has internal and external predictive controller levels. In the lower layer of the controller, a constrained predictive controller is designed that is capable of rejecting perturbations and quickly tracking the reference path, and in the outer loop, a model predictive controller is designed to optimally detect the moving ground target where, the sub-cost functions were defined so that the quad-rotor would be able to track the moving ground target even if it was temporarily out of sight of the...
Designing a hierarchical model-predictive controller for tracking an unknown ground moving target using a 6-DOF quad-rotor
, Article International Journal of Dynamics and Control ; Volume 9, Issue 3 , 2021 , Pages 985-999 ; 2195268X (ISSN) ; Badri, P ; Mohammadkhani, H ; Sharif University of Technology
Springer Science and Business Media Deutschland GmbH
2021
Abstract
In this paper, a hierarchical predictive controller is designed in order to solve the tracking problem of a moving ground target by a quad-rotor in an unknown and uneven environment. This controller has internal and external predictive controller levels. In the lower layer of the controller, a constrained predictive controller is designed that is capable of rejecting perturbations and quickly tracking the reference path, and in the outer loop, a model predictive controller is designed to optimally detect the moving ground target where, the sub-cost functions were defined so that the quad-rotor would be able to track the moving ground target even if it was temporarily out of sight of the...
Ground Moving Target Indication (GMTI)Algorithm in Synthetic Aperture Radar (SAR)
, M.Sc. Thesis Sharif University of Technology ; Nayebi, Mohammad Mahdi (Supervisor)
Abstract
Today, SAR radars are one of the most practical tools for controlling and monitoring surface targets, and so far, several methods have been proposed to create a profile image of the reflection coefficient of surface targets in these Radars. The main problem in these methods is the ability to simultaneously create a reflection coefficient profile image for stationary and moving targets. To create a profile image of the reflection coefficient of moving targets, first it is necessary to detect and estimate its kinetic parameters.This thesis presents a method for detecting and estimating Ground moving targets parameters using Keystone transfer conversion and also presents a method for creating...
Cooperative search and localization of ground moving targets by a group of UAVs considering fuel constraint
, Article Scientia Iranica ; Volume 26, Issue 5 B , 2019 , Pages 2784-2804 ; 10263098 (ISSN) ; Effati, M ; Motie, M ; Sharif University of Technology
Sharif University of Technology
2019
Abstract
A cooperative task allocation and search algorithm is proposed to find and localize a group of ground-based moving targets using a group of Unmanned Air Vehicles (UAVs) working in a decentralized manner. It is assumed that targets have RF emissions. By using an algorithm including Global Search (GS), Approach Target (AT), Locate Target (LT), and Target Reacquisition (TR) modes, UAVs cooperatively search the entire parts of a desired area, approach to the detected targets, locate the targets, and search again to find the targets that stop transmitting their RF emissions during the localization process, respectively. In the GS mode, UAVs utilize a cost function to select the best zone for...
Cooperative search and localization of ground moving targets by a group of UAVs considering fuel constraint
, Article Scientia Iranica ; \Volume 26, Issue 5 B , 2019 , Pages 2784-2804 ; 10263098 (ISSN) ; Effati, M ; Motie, M ; Sharif University of Technology
Sharif University of Technology
2019
Abstract
A cooperative task allocation and search algorithm is proposed to find and localize a group of ground-based moving targets using a group of Unmanned Air Vehicles (UAVs) working in a decentralized manner. It is assumed that targets have RF emissions. By using an algorithm including Global Search (GS), Approach Target (AT), Locate Target (LT), and Target Reacquisition (TR) modes, UAVs cooperatively search the entire parts of a desired area, approach to the detected targets, locate the targets, and search again to find the targets that stop transmitting their RF emissions during the localization process, respectively. In the GS mode, UAVs utilize a cost function to select the best zone for...