Effect of multipath and scattering on array gain of a large adaptive beam forming phased array

Steinberg, Bernhard; Yadin, E.

doi:10.1109/tap.1985.1143624

Cited by 5 publications

(1 citation statement)

References 4 publications

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“…이러한 CIWS는 함정계 층방어의 최종 방어수단이기 때문에, 높은 정확도를 갖는 레이다를 이용하여 목표물을 탐지하고, 해당 목표물의 정 확한 거리 및 각도를 계산하는 것이 매우 중요하다 [2] . 하 지만 포신, 레이돔, 철제 지지대 등 탑체 구조체에 의해 발생하는 물리적•전기적인 전자파 차폐 혹은 다중경로 현상은 탐지 및 추적 레이다의 각도 예측 정확도를 열화 시킨다 [3], [4] . 이러한 성능 열화를 사전에 예측하고, 설계에 반영하기 위해서는 탑재 구조체와 안테나의 전자기적 특 성이 반영된 full-wave 시뮬레이션 기반의 성능평가가 필 수적이다.…”

Section: ⅰ 서 론unclassified

Performance Evaluation of Radar Array Antennas Based on Complex Received Currents Using Full-Wave Simulations with Surrounding Platforms

Yu¹,

Lee²,

Park³

et al. 2021

J. Korean Inst. Electromagn. Eng. Sci.

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In this study, we propose a systematic performance evaluation process based on complex received currents for searching and tracking radars. This process incorporates an approach to simplified geometries of array antennas and cannon platforms that accurately represent the electromagnetic properties of the original geometries. The simplified geometries are used in full-wave electromagnetic simulations to compute the current magnitudes and phases induced in array antenna ports, and the values are saved as complex steering vectors. In addition, we propose a novel metric for evaluating the received performance distortions using the saved complex steering vectors, which were cross-checked with a conventional pattern distortion metric. To verify the feasibility of the proposed process, the optimal placement of array antennas for a commercial searching and tracking radar system was determined. The results demonstrate that average magnitudes and phases distortions of less than 1 mA and 3°, respectively, can be obtained when the array antennas are placed at 0.6and 1.1-m heights above the platform.

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Section: ⅰ 서 론unclassified

Performance Evaluation of Radar Array Antennas Based on Complex Received Currents Using Full-Wave Simulations with Surrounding Platforms

Yu¹,

Lee²,

Park³

et al. 2021

J. Korean Inst. Electromagn. Eng. Sci.

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A phase aberration correction method for ultrasound imaging

Karaman

Atalar

Köymen

et al. 1993

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

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A computationally efficient method for phase aberration correction in ultrasound imaging is presented. The method is based on time delay estimation via minimization of the sum of absolute differences between radio frequency samples of adjacent array elements. Effects of averaging estimated aberration patterns over scan angle and truncation to a single bit wordlength are examined. Phase distortions due to near-field inhomogeneities are simulated using silicone rubber aberrators. Performance of the method is tested using experimental data. Simulation studies addressing different factors affecting efficiency of the method, such as the number of iterations, window length, and the number of scan angles used for averaging, are presented. Images of a standard resolution phantom are reconstructed and used for qualitative testing.

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Phase-aberration correction using signals from point reflectors and diffuse scatterers: basic principles

Flax,

O'Donnell

1988

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

460

213

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Methods for correction of phase aberrations induced by near-field variations in the index of refraction are explored. Using signals obtained from a sampled aperture (i.e. transducer array), phase aberrations can be accurately measured with a correlation approach similar to methods used in adaptive optics and radar. However, the method presented here has no need for a beacon or an ideal point reflector to act as a source for estimating phase errors. It uses signals from random collections of scatterers to determine phase aberrations accurately. Because there is no longer a need for a beacon signal, the method is directly applicable not only to medical ultrasound imaging but also to any coherent imaging system with a sampled aperture, such as radar and sonar.

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Effect of multipath and scattering on array gain of a large adaptive beam forming phased array

Cited by 5 publications

References 4 publications

Performance Evaluation of Radar Array Antennas Based on Complex Received Currents Using Full-Wave Simulations with Surrounding Platforms

Performance Evaluation of Radar Array Antennas Based on Complex Received Currents Using Full-Wave Simulations with Surrounding Platforms

A phase aberration correction method for ultrasound imaging

Phase-aberration correction using signals from point reflectors and diffuse scatterers: basic principles

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