Loading...
Search for:
theoretical-development
0.015 seconds
Efficient algebraic solution for elliptic target localisation and antenna position refinement in multiple-input-multiple-output radars
, Article IET Radar, Sonar and Navigation ; Volume 13, Issue 11 , 2019 , Pages 2046-2054 ; 17518784 (ISSN) ; Behnia, F ; Noroozi, A ; Sharif University of Technology
Institution of Engineering and Technology
2019
Abstract
In this study, an algebraic closed-form method for jointly locating the target and refining the antenna positions in multiple-input-multiple-output radar systems is proposed. First, a set of linear equations is formed by non-linear transformation and nuisance parameters elimination, and then, an estimate of the target position is obtained by employing a weighted least-squares estimator. To jointly refine the target and antenna positions, the associated error terms are estimated in the sequence. The proposed method is shown analytically and confirmed by simulations to attain the Cramér-Rao lower bound performance under small-error conditions. Numerical simulations are given to support the...
Iterative constrained weighted least squares solution for target localization in distributed MIMO radar
, Article 27th Iranian Conference on Electrical Engineering, ICEE 2019, 30 April 2019 through 2 May 2019 ; 2019 , Pages 1710-1714 ; 9781728115085 (ISBN) ; Nayebi, M. M ; Amiri, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
This paper concentrates on the target localization problem in a distributed multiple-input multiple-output radar system using the bistatic range (BR) measurements. By linearizing the BR measurements and considering the relationship between the nuisance parameter and the target position, a constrained weighted least squares (CWLS) problem is formulated, which is an indefinite quadratically constrained quadratic programming problem. Since the constraint is non-convex, it is a nontrivial task to find the global solution. For this purpose, an improved Newton's method is applied to the CWLS problem to estimate the target position. Numerical simulations are included to examine the algorithm's...
Target localization in distributed MIMO radar from time delays, doppler shifts, azimuth and elevation angles of arrival
, Article 27th Iranian Conference on Electrical Engineering, ICEE 2019, 30 April 2019 through 2 May 2019 ; 2019 , Pages 1498-1503 ; 9781728115085 (ISBN) ; Navebi, M. M ; Amiri, R ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2019
Abstract
In this paper, we focus on the moving target localization problem in a multiple-input multiple-output radar with widely separated antennas. By exploiting jointly different types of information including time delay, Doppler shift and azimuth and elevation angles of arrival, we develop an algebraic closed-form two-stage weighted least squares solution for the problem. The proposed algorithm is shown analytically to attain the CramerRao lower bound accuracy under the small Gaussian noise assumption. Numerical simulations are included to examine the algorithm's performance and corroborate the theoretical developments
Mindlin–Eringen anisotropic micromorphic elasticity and lattice dynamics representation
, Article Philosophical Magazine ; Volume 100, Issue 2 , 2020 , Pages 157-193 ; Shodja, H. M ; Sharif University of Technology
Taylor and Francis Ltd
2020
Abstract
To account for certain essential features of material such as dispersive behaviour and optical branches in dispersion curves, a fundamental departure from classical elasticity to polar theories is required. Among the polar theories, micromorphic elasticity of appropriate grades and anisotropy is capable of capturing these physical phenomena completely. In the mathematical framework of micromorphic elasticity, in addition to the traditional elastic constants, some additional constants are introduced in the pertinent governing equations of motion. A precise evaluation of the numerical values of the aforementioned elastic constants in the realm of the experimentations poses serious...