A Method for Elimination of Common Grating Lobes for Designing Optimum Periodic Sparse Arrays

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

Lee

Yeo

et al. 2020

Self Cite

Sparse arrays have been studied mainly to reduce the large numbers of elements in 2-D arrays. However, they can also provide an effective means of miniaturizing ultrasound 1-D array systems for point-of-care applications. Although a variety of sparse array design strategies have been proposed, designing an optimum sparse array to simultaneously satisfy the system specification requirements and performance criteria remains a challenge. This article presents an analytical approach for the design of an optimum pair of periodic sparse arrays (PSAs), one for transmission and the other for reception. The approach is based on three newly derived theorems that describe the most important properties of the two PSAs forming the sparse array pair and their relationship pertaining to the overall beam pattern. The proposed approach can be used to design 1-D sparse array pairs with arbitrary sparseness factors while meeting given performance criteria. The computer simulation verified that the spatial resolution of a 64-element phased array can be obtained with a PSA pair consisting of transmit and receive sparse arrays, of which the number of elements is reduced to 32 and 22, respectively. Index Terms-Grating lobe, periodic sparse array (PSA), phased array, point of care (POC), ultrasound imaging. I. INTRODUCTION S MARTPHONE-BASED ultrasound scanners have drawn great attention from researchers, industry, and clinical institutions, as they can serve as a very effective tool for pointof-care (POC) applications both in and out of hospitals [1]-[3].

Section: Analytical Model For Psasmentioning

confidence: 99%

mentioning

confidence: 99%

An Analytical Approach to Designing Optimal Sparse 1-D Phased Arrays for Handheld Ultrasound Imaging

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

Lee

Yeo

et al. 2020

Self Cite

“…It results in reducing the aperture size and consequently degrading the lateral resolution. Therefore, various sparse array techniques have been studied for reducing the number of active elements in the required aperture size [3][4][5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, although the grating lobes are produced, PSA using periodically distributed elements can control the location of grating lobes [5][6][7][8] . At this time, if different periodicities are used for transmit and receive arrays, the transmit and receive grating lobes will destructively interfere in the overall beam pattern.…”

Section: Introductionmentioning

confidence: 99%

“…An optimum design of PSA, therefore, should be to prevent or eliminate the dominant grating lobes, which is located at the same position on transmit and receive beam patterns, so called "common grating lobes(CGL)." In the previous work, we proposed a design method for eliminating CGL based on the CW beam pattern analysis [7][8] . The proposed general model of PSA can be represented as sub-arrays distributed uniformly in P -element intervals, each with L consecutive elements, where L P < .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A method to design an optimum pair of transmit and receive periodic sparse arrays

Kim

2008

SPIE Proceedings

Self Cite

In such applications as fast 3D imaging with 2D arrays and point-of-care imaging with an ultra portable devices, periodic sparse arrays(PSA) can be efficiently used to increase the effective aperture size with less number of active elements than the conventional method. Generally, PSA can be represented as sub-arrays distributed uniformly in P -element intervals, each with L consecutive elements, where L P < . Since the continuous wave beam pattern in the far-field is given by Fourier transform of aperture function, the beam pattern of PSA is a multiplication of beam patterns of the upsampled dense array by the ratio of P and L -elements sub-array. A recent method to design a PSA pair provides analytically the values of P and L for transmit and receive arrays to eliminate the dominant grating lobes, which occur at the same position on both transmit and receive. In this work, we present a method to design a PSA pair with improved performance by further suppressing the residual grating lobes of PSA. It can be accomplished by properly shading amplitude of the transmit and receive sparse arrays. This shading window function is also obtained by signal analysis of aperture functions. The beam patterns of various PSA pairs based on the proposed design method are evaluated through computer simulations. The simulation results show that the residual grating lobes are reduced by about 10dB more in all cases. Consequently, our method can be used to improve the performance of beam pattern or enhance the periodicity of sparse array.

Synthetic transmit aperture focusing using optimal sparse receive array for reducing computational complexity

Park

2016

Electron. lett.

Synthetic transmit aperture focusing (STAF) has the problem of high computational complexity. An STAF scheme with greatly reduced computational complexity by using an optimal periodic sparse receive array (SRA) is proposed. An analytic method to design optimal SRAs that provide minimum main lobe width and grating lobe levels for a given number of active receive elements is also suggested. The experiment results show that the proposed STAF method can reduce computational complexity by up to 66.67% compared with conventional STAF.