• Title/Summary/Keyword: Conformal Array

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Performance Analysis of FFTSA Method in the Water Environment Using Conformal Towed Acoustic Array (왜곡된 형태의 견인 음향 배열 기법을 적용한 수중환경하에서의 FFTSA 기법 성능분석)

  • 최주평;이원철
    • The Journal of the Acoustical Society of Korea
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    • v.20 no.8
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    • pp.44-57
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    • 2001
  • This paper analyses the performance of FFTSA (Fast Fourier Transform Synthetic Aperture) in the effects of temporal coherence and oscillatory towed course, which is one of the techniques for passive synthetic aperture SONAR process using linearly distributed towed array. Also this paper proposes the FFTSA technique using towed array having conformal shape to alleviate the performance degradation for estimating the incident angle under inconsistent under water environments. And this paper analyses the performance of the proposed FFTSA technique making use of conformal structure throughout exhaustive computer simulations.

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A Study on the Conformal Array Beam Synthesis Technique for Integrated Mast Application (통합마스트 적용을 위한 컨포멀 어레이 빔 합성 기법에 관한 연구)

  • Kim, Youngwan;Ra, Young-eun;Lee, Jonghak;Park, Jongkuk
    • Journal of IKEEE
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    • v.24 no.2
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    • pp.626-631
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    • 2020
  • In this paper, a study on beam synthesis technique of conformal array was performed. It is applied to various radar systems that can perform beam steering without deterioration of performance due to beam steering in a general linear arrangement. Unlike the beam synthesis technique in the planar linear array, the conformal array has a radiation element located on a curved surface, so it is necessary to compensate for a difference in length from the radaation element to the wave front surface. In addition, by calculating the offset angle for each radiation element and applying it during actual synthesis, it was possible to predict an accurate beam pattern. In this paper, length compensation and offset angle were calculated and applied to beam pattern synthesis to perform beam pattern comparison, and performance was compared through mathematical analysis.

Pattern Synthesis of Rotated-type Conformal Array Antenna Using Enhanced Adaptive Genetic Algorithm (향상된 적응형 유전 알고리즘을 이용한 회전체형 컨포멀 배열 안테나의 패턴 합성)

  • Seong, Cheol-Min;Kwon, Oh-Hyeok;Park, Dong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.26 no.8
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    • pp.758-764
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    • 2015
  • This paper describes the pattern synthesis of array antenna which conforms to a metallic curved surface formed by the rotation of a quadratic function by using EAGA(Enhanced Adaptive Genetic Algorithm). Three rotated-type conformal surfaces are realized by changing the coefficient of the quadratic function and the pattern of each conformal array antenna is synthesized. In order to reduce the overall time of pattern synthesis, the transformed active element pattern obtained by the active element pattern of the 2-dimensional planar array using Euler angles rotation is utilized instead of the active element pattern of the 3-dimensional conformal array antenna itself. To verify validity of the proposed synthesis procedure, the synthesized patterns using EAGA are compared with those obtained by MWS.

Compensation Algorithm of Beamforming Error for Wideband Conformal Array Antenna (광대역 컨포멀 위상 배열 안테나의 빔형성 열화 보상 알고리즘)

  • Yoon, Ho-Joon;Lee, Kang-In;Nam, Sang-Wook;Chung, Young-Seek;Yoon, Young-Joong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.28 no.6
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    • pp.478-486
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    • 2017
  • In this paper, we propose an algorithm for the wideband beamforming in a conformal phased array antenna by compensating the errors. For the wideband beamforming, we used the True Time Delay(TTD), which was fabricated on the RF circuit board to obtain long delay lines. Beamforming errors in the conformal array antenna are the mutual coupling between the array elements, the dispersive error in the TTD circuit, and the quantization error by the digital control. We apply the compensation algorithm to the conformal phased array antenna of wideband 2~4 GHz, and verify the usefulness by comparing the results with the experiment results.

A Study on Performance Improvement of Target Motion Analysis using Target Elevation Tracking and Fusion in Conformal Array Sonar (컨포멀 소나에서의 표적고각 추적 및 융합을 이용한 표적기동분석 성능향상 연구)

  • Lee, HaeHo;Park, GyuTae;Shin, KeeCheol;Cho, SungIl
    • Journal of the Korea Institute of Military Science and Technology
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    • v.22 no.3
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    • pp.320-331
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    • 2019
  • In this paper, we propose a method of TMA(Target Motion Analysis) performance improvement using target elevation tracking and fusion in conformal array sonar. One of the most important characteristics of conformal array sonar is to detect a target elevation by a vertical beam. It is possible to get a target range to maximize advantages of the proposed TMA technology using this characteristic. And the proposed techniques include target tracking, target fusion, calculation of target range by multipath as well as TMA. A simulation study demonstrates the outstanding performance of proposed techniques.

A Study of Broad-band Conformal Beam Forming using Moving Least Squares Method (Moving Least Squares 기법을 이용한 광대역 컨포멀 빔 형성 연구)

  • Jung, Sang-Hoon;Lee, Kang-In;Jung, Hyun-Kyo;Chung, Young-Seek
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.68 no.1
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    • pp.83-89
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    • 2019
  • In this paper, beam forming using moving least squares method (MLSM) is studied. In the previous research, the least squares method (LSM), one of the data interpolation methods, was used to determine the desired beam pattern and obtain a beam pattern that minimizes the square of the error with the desired beam pattern. However, LSM has a disadvantage in that the beam pattern can not be formed to satisfy the exact steering angle of the desired beam pattern and the peak sidelobe level (PSLL) condition. To overcome this drawback, MLSM is used for beam forming. In order to verify, the proposed method is applied in beam forming of Bezier platform array antenna which is one of conformal array antenna platform.

3-D interpolation technique and compressive sensing for 3-D conformal array (3차원 interpolation technoque과 compressive sensing을 이용한 비 균일한 3차원 array의 beam pattern 복구)

  • Kang, K;Seol, K;Cesar, W;Jeong, S;Koh, J
    • Annual Conference of KIPS
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    • 2017.04a
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    • pp.106-108
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    • 2017
  • 본 논문에서는 휘어지거나 굴곡진 array인 3차원 conformal array의 beam pattern을 보정하고자 기존의 2차원에서 3차원으로 확장한 interpolation technique과 compressive sensing을 이용하여 3-D uniform rectangular array(3-D URA)에 적용하는 방법을 연구하였다. 시뮬레이션 결과는 compressive sensing이 interpolation technique보다 우수한 특성을 보여준다.

Investigation of Outer Flow Noise Reduction of the Hydrophones Embedded in the Elastomer (탄성층에 삽입된 음향 하이드로폰의 외부 유입소음 영향 연구)

  • Park, Ji-hye;Lee, Jong-kil;Shin, Ku-kyun;Cho, Chi-yong
    • 대한공업교육학회지
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    • v.33 no.2
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    • pp.273-286
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    • 2008
  • Underwater acoustic sensor array can detect acoustic signal in underwater and the sensor array can be mounted in each left, right or front side of the UUV(Unmanned Underwater Vehicle). The sensor array could be conformal array and effected turbulent boundary layer flow noise. Therefore, in this paper numerical simulations were performed to know the how the outer flow noise affect the hydrophone which embedded in the elastomer. Corcos wall pressure model was used as turbulent boundary layer flow noise and this model was applied to the frequency density function. Characteristics of transfer function according the kx wave number were simulated and design parameters were thickness of elastomer, density, and modulus of elasticity. Based on the simulation results when increasing the thickness of elastomer noise reduction was increased. This results can be applied to the design of conformal array of UUV.

Wideband Microstrip Conformal Patch Array Antenna with Tilted Beam (빔 틸트 특성을 갖는 광대역 Conformal 패치 어레이 안테나)

  • Park, Jeong-Soo;Kim, Inbok;Kim, Honghui;Lee, Seong Rak;Eo, Yun-Seong;Kim, Jeong-Geun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.5
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    • pp.416-423
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    • 2016
  • In this paper, a conformal type $1{\times}4$ microstrip patch array antenna with tilted antenna beam is presented for UWB sensor applications. Each antenna element comprises E-shaped patch with L-probe feeding to increase the bandwidth. The tilted antenna beam of 20 degree can be achieved with 42 ps microstrip delay lines at the series feeding network with T-junctions. The measured reflection coefficient is >9 dB at 3.5~4.5 GHz. The measured antenna gain and HPBW are >10 dBi and <30 degree at 3.75~4.25 GHz.

Study on Beamforming of Conformal Array Antenna Using Support Vector Regression (Support Vector Regression을 이용한 컨포멀 배열 안테나의 빔 형성 연구)

  • Lee, Kang-In;Jung, Sang-Hoon;Ryu, Hong-Kyun;Yoon, Young-Joong;Nam, Sang-Wook;Chung, Young-Seek
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.11
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    • pp.868-877
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    • 2018
  • In this paper, we propose a new beamforming algorithm for a conformal array antenna based on support vector regression(SVR). While the conventional least squares method(LSM) considers all sample errors, SVR considers errors beyond the given error bound to obtain the optimum weight vector, which has a sparse solution and the advantage of the minimization of the overfitting problem. To verify the performance of the proposed algorithm, we apply SVR to the experimentally measured active element patterns of the conformal array antenna and obtain the weights for beamforming. In addition, we compare the beamforming results of SVR and LSM.