Fast Method for Sidelobe Nulling in a Partially Adaptive Linear Array Using the Elements Positions

Hejres, J.A.; Peng, Albert; Hijres, J.

doi:10.1109/lawp.2007.900955

Cited by 10 publications

(15 citation statements)

References 8 publications

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“…In the original PI algorithm, signals from each antenna element are weighted by and are added together to yield an output , where denotes the conjugate transpose. The PI algorithm aims to minimize the output power by achieving an optimal weight (4) where is the sampling number. When there exists an incident high power interference, the PI algorithm will automatically generate a deep null facing the direction of the incident interference, achieving an anti-interference result.…”

Section: Algorithmmentioning

confidence: 99%

“…To synthesize different beams satisfying different application requirements, various beamforming algorithms have been developed [2]. In most cases, the objective of a beamforming algorithm is to shape the main lobe and sidelobes, so as to provide a desirable gain, beamwidth, and sidelobe suppression [3], [4], or to tune the orientations of nulls and eliminate interferences incident from specific directions, obtaining the so-called nulling antennas [5], [6]. However, for phased array antennas consisting of multiple radiation elements, it is normally difficult to synthesize a beam with wide-angle coverage due to the relatively large aperture with respect to the operating wavelength.…”

Section: Introductionmentioning

confidence: 99%

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Unconventional Beamforming for Quasi-Hemispheric Coverage of a Phased Array Antenna

Peng

Cui

et al. 2013

Antennas Wirel. Propag. Lett.

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It is usually difficult to synthesize a wide-angle coverage beam for an array antenna. In this letter, we propose an unconventional beamforming approach for a phased array antenna. By optimizing the orientations and depths of nulls of the radiation pattern, "effective" quasi-hemispheric coverage with a single remaining null in the direction of no interest can be achieved. We modify an existing nulling algorithm to synthesize such a special radiation pattern by introducing a hypothetical incidence of interference and Gaussian white noise. Analysis and simulation of a five-element linear array antenna verified the effectiveness of the proposed approach.

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Section: Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unconventional Beamforming for Quasi-Hemispheric Coverage of a Phased Array Antenna

Peng

Cui

et al. 2013

Antennas Wirel. Propag. Lett.

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“…Thus it finds direct application in radar, sonar and mobile communication [1][2][3]. In literature various analytical and computational methods are available to address the issue of null steering [4][5][6]. The situation becomes more challenging and complicated when an element fails in the active antenna array.…”

Section: Introductionmentioning

confidence: 99%

Null Placement and Sidelobe Suppression in Failed Array Using Symmetrical Element Failure Technique and Hybrid Heuristic Computation

Khan¹,

Qureshi²,

Zaman³

et al. 2013

PIER B

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Abstract-In this paper, we have addressed three major problems of uniform linear array in case of a sensor failure at any position. We assume that sensor position is known. The problems include increase in sidelobe levels, displacement of nulls and diminishing of null depth. The desired null depth is achieved by making the weight of symmetrical counterpart element passive. Genetic algorithm (GA) along with pattern search (PS) is used for reduction of sidelobe levels, and adjustment of nulls. Fitness function minimizing the error between the desired and estimated beam pattern along with null constraints is used. Simulation results for diversified scenarios have been given to demonstrate the validity and performance of the proposed algorithm.

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“…Null steering for adaptive antenna system has been a subject of intensive interest in past [1] and has its importance even to date [2]. It has applications in the fields of radar and wireless communications.…”

Section: Introductionmentioning

confidence: 99%

“…There are also alternative approaches like position perturbation or the element elevation, for null steering but these approaches are slow for large arrays because the computational time increases to find new position perturbation or elevation for these arrays. Fast algorithms are being developed for the alternative techniques by controlling the position of selected elements, [2,3] and [5] i.e. the movement of all the elements is avoided.…”

Section: Introductionmentioning

confidence: 99%

Independent null steering by decoupling complex weights

Khan¹,

Naveed²,

Qureshi³

et al. 2011

IEICE Electron. Express

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Abstract:In this paper, we propose a structure for independent null steering by decoupling complex weights. It has the advantage of independent steering of (N − 1) nulls for a linear array having N elements and the complex weights are decoupled such that each weight corresponds to a particular null. For this purpose, the position of each zero of the array factor on the unit circle in the complex plane is controlled by the corresponding weight in the structure. It means that if a single jammer changes its position, only a single corresponding complex weight has to be recalculated, which reduces computational complexity. Keywords: null steering, linear array, array factor, progressive phase Classification: Science and engineering for electronics References[1] H. Krim and M. Viberg, "Two decades of array signal processing research,"

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Fast Method for Sidelobe Nulling in a Partially Adaptive Linear Array Using the Elements Positions

Cited by 10 publications

References 8 publications

Unconventional Beamforming for Quasi-Hemispheric Coverage of a Phased Array Antenna

Unconventional Beamforming for Quasi-Hemispheric Coverage of a Phased Array Antenna

Null Placement and Sidelobe Suppression in Failed Array Using Symmetrical Element Failure Technique and Hybrid Heuristic Computation

Independent null steering by decoupling complex weights

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