3 edition of Nonuniformly Spaced Array Elements found in the catalog.
Nonuniformly Spaced Array Elements
by Storming Media
Written in English
|The Physical Object|
Direction of arrival estimation (DoA) is one of the most demanding problems which one has to solve for localizing and tracking multiple rapidly moving targets as in radar, mobile communication and in other areas. In this paper, an approach is presented for two dimensional direction of arrival (2D-DoA) estimation using a single snapshot of the voltages measured at nonuniformly spaced. An efficient method to compute the array factors of non-uniformly spaced arrays A. M. E. S. ~asimiro', X. F. ~ e r? & A. J. R. ~ z e v e d o ~ I Author: A. M. E. S. Casimiro, X F. Ren, A. J. R. Azevedo.
Non-uniformly spaced linear antenna array design by means of PEEC approach applying Cheetah optimization algorithm Sinvaldo R. Moreno, Carlos E Klein, Viviana C Mariani, Leandro dos S. Coelho, Piergiorgio Alotto, Riccardo Torchio, Thomas Bauernfeind, Paul BaumgartnerAuthor: Sinvaldo R. Moreno, Carlos E. Klein, Viviana C. Mariani, Viviana C. Mariani, Leandro dos S. Coelho. This paper investigates the optimization and synthesis of nonuniformly spaced arrays with respect to the flattening of their grating plateaux. The analysis begins with the proof that the exponential spacing gives flat space-factor grating plateaux, using Poisson's sum and the stationary phase method. The theory then is generalized to include arrays of nonisotropic elements.
Part of the Lecture Notes in Computer Science book series (LNCS, volume ) The same algorithm is applied successively on circular arrays of 8, 10 and 12 elements. Various simulation results are presented. D.G.: Synthesis of nonuniformly spaced arrays using genetic algorithm. In: Asia-Pacific Conference on Environmental Cited by: 4. Using the grid in the spatial domain, the element positions of one non-uniformly spaced array are set to another equi-spaced array with the smaller spacing. Then, the conventional IFFT (Inverse FFT) algorithm is used to compute its array by: 1.
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Nonuniformly Spaced Array Elements Paperback – Novem by Daniel R. Richards (Author) See all 2 formats and editions Hide other formats and editions. Price New from Used from Paperback "Please retry" $ $ Author: Daniel R. Richards. The book is concerned with two major disciplines in array design: the geometric properties of arrays, which are handled by physical optics, Fourier and Fresnel transforms, and convolution theory.
The use of directional elements together with non-uniform spacing technique permits larger inter-element spacings in the array without resulting in large sidelobes in the response pattern.
Available synthesis methods are inadequate despite the large number of papers published on the subject since its introduction 7 years ago. The method is further applied to find the element positions in nonuniformly spaced linear arrays with uniform excitation that produce minimized (equal) sidelobe levels, and comparisons are made.
When all elements of a uniformly-spaced, array are phase in, the arra factoy isr ' 3 N E (e) = Y_ I e n j |3ndcos9 n=0 where I is th magnitude oef the curren excitatiot n n ° th of the n element, d is the constant spacing of the elements, 9 is the angle from lin th oeef the array.
Nonuniformly Spaced Antenna Elements The main advantage of nonuniformly spaced arrays presented in this paper is the reduction of sidelobe levels by using nonuniform elements spacing, while retaining uniform excitation.
Nonuniform spacing of elements means that icosahedronical structure mentioned in the previous section is perturbed. Synthesis of nonuniformly spaced antenna arrays John Philip Basart Iowa State University Follow this and additional works at: Part of theElectrical and Electronics Commons This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State.
00r 00 w H H a 00 Fig. 2 Effect of reduced element spacing while maintaining the same total number of elements as in figure 1. Element spacing is cm 1 (periodic array). 00 Fig. 3 Aperiodic element spacing with a geometric factor of Cited by: 1. The multifrequency array produces a better beam pattern than either the aperiodic or combination aperiodic/multifrequency array.
Both the aperiodic and multifrequency arrays have a narrower main lobe and higher side lobe response than a periodic array with reduced element spacing and an equal number of by: 1.
Linear Array of Non-Uniformly Spaced Antennas with Non-Uniform Excitation Amplitude Ifeoma B. Asianuba, Amthony.N. Nzeako Abstract: A numerically efficient approach based on the Method of Moments (MoM) analysis is described for a non-uniform linear array antenna with unequal inter-element Size: KB.
The results compare favorably to published results for nonuniformly spaced designs that did not exploit the special properties of uniform or discrete nonuniform arrays. Published in: IEEE Transactions on Acoustics, Speech, and Signal Processing (Volume: 36, Issue: 3, Mar )Cited by: Two Dimensional Direction of Arrival Estimation using Single Snapshot of Nonuniformly Spaced Planar Array Abstract: Direction of arrival estimation (DoA) is one of the most demanding problems which one has to solve for localizing and tracking multiple rapidly moving targets as in radar, mobile communication and in other areas.
Numerical examples including non-uniformly spaced 4D linear array ( elements) and non-uniformly spaced 4D planar array (32 × 32 = elements) are presented to validate the efficiency of the proposed by: 4.
A nonuniformly spaced linear antenna array with broadside radiation characteristics is synthesized using firefly algorithm and particle swarm optimization. The objective of the work is to find the. Abstract. Arrays with uniformly spaced elements (often called uniformly spaced arrays) have been widely studied, mainly for two reasons: mathematical tractability in many cases and simplicity in discussed in Chap the pattern function of a uniformly spaced array, no matter how it is excited, is always periodic in the wave-vector k-space, or sometimes expressed in the so.
Antenna array contains a number of non-uniformly spaced elements. The elements through the phase and amplitude control are connected to a corporate network. The antenna array can be synthesized for different types and positions of the elements and for different platforms depending on the needs.
NONUNIFORMLY SPACED LINEAR ARRAY DESIGN FOR THE SPECIFIED BEAMWIDTH/SIDELOBE LEVEL OR SPECIFIED DIRECTIVITY/SIDELOBE LEVEL WITH COUPLING CONSIDERATION By H.
Oraizi and M. Fallahpour. Full Article PDF ( KB) Abstract: In this paper, we investigate nonuniformly spaced linear arrays (NUSLA) rigorously. This paper describes a modified genetic algorithm (MGA) for optimizing the performance of linear sparse arrays with a fixed current distribution.
Under the design constraints of the number of elements, the aperture and the minimum element spacing, the MGA has been utilized to optimize the element position to reduce the peak sidelobe level (PSLL) of the sparse arrays.
This electromagnetic preprocessing technique transforms the voltages that are induced in a nonuniformly spaced array containing real antenna elements to a set of voltages that will be produced in a uniform linear virtual array (ULVA) containing omnidirectional isotropic point by: The array consists of 32 non-uniformly spaced, uniformly excited, log periodic antennae designed to operate over a 2: 1 frequency band.
At the highest operating frequency, the array has a beam-width of approximately 1 ° and side-lobes at least 16–5 dB below the main beam by: 2. SATCOM on the move with electrical beam scanning capabilities has found great interest recently due to its low profile and low maintenance cost for both civilian and military applications.
Uniformly distributed array elements have been widely used for phased array antennas. However, a growing number of research on non-uniform distributed array has been : Levent Sahin, Erdem Ozyurt, Kamil Yavuz Kapusuz, Simsek Demir, Yakup Sen, Ugur Oguz.Simplified Analytical Procedure for Four-Element Nonuniformly Spaced Arrays Article (PDF Available) in IEEE Transactions on Antennas and Propagation 28(2) - April with 14 Reads.The use of non-uniformly spaced elements in antenna arrays is a relatively recent development, the merits of which are still being determined.
A verity of investigations has been undertaken to see if the number of elements in an array of fixed size could be reduced significantly without causing serious deterioration of the pattern (1).