Uniform circular arrays for phased array antenna

Noordin, Nurul H.; Zuniga, Virgilio; El-Rayis, Ahmed O.; Haridas, Nakul; Erdogan, A.T.; Arslan, Tughrul

doi:10.1109/lapc.2011.6114031

Cited by 43 publications

(23 citation statements)

References 16 publications

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“…In the absence of edge constraints, the beam pattern of a circular array can be electronically rotated. Moreover, the circular arrays also have the capability to compensate for the effect of mutual coupling by breaking down the array excitation into a series of symmetrical spatial components [35,36].…”

Section: Uniform Circular Arraymentioning

confidence: 99%

Direction of Arrival Estimation of GPS Narrowband Jammers Using High-Resolution Techniques

Moussa

Osman

Tamazin

et al. 2019

Sensors

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GPS jamming is a considerable threat to applications that rely on GPS position, velocity, and time. Jamming detection is the first step in the mitigation process. The direction of arrival (DOA) estimation of jamming signals is affected by resolution. In the presence of multiple jamming sources whose spatial separation is very narrow, an incorrect number of jammers can be detected. Consequently, mitigation will be affected. The ultimate objective of this research is to enhance GPS receivers’ anti-jamming abilities. This research proposes an enhancement to the anti-jamming detection ability of GPS receivers that are equipped with a uniform linear array (ULA) and uniform circular array (UCA). The proposed array processing method utilizes fast orthogonal search (FOS) to target the accurate detection of the DOA of both single and multiple in-band CW jammers. Its performance is compared to the classical method and MUSIC. GPS signals obtained from a Spirent GSS6700 simulator and CW jamming signals were used. The proposed method produces a threefold advantage, higher accuracy DOA estimates, amplitudes, and a correct number of jammers. Therefore, the anti-jamming process can be significantly improved by limiting the erroneous spatial attenuation of GPS signals arriving from an angle close to the jammer.

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Section: Uniform Circular Arraymentioning

confidence: 99%

Direction of Arrival Estimation of GPS Narrowband Jammers Using High-Resolution Techniques

Moussa

Osman

Tamazin

et al. 2019

Sensors

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“…Didalam astronomi radio, susunan antena sirkular juga telah diadopsi, misalnya pada teleskop radio Eight-meter-wavelength Transient Array (ETA) [3]- [4]. Susunan sirkular telah menjadi konfigurasi yang banyak digunakan karena memiliki geometri yang simetris sehingga memungkinkan susunan antena tersebut melakukan pemindaian pada arah azimuth [5] melalui proses pengarahan respon antena (beam steering) [6].…”

Section: Pendahuluanunclassified

Pengaruh Elemen Sentral Pada Susunan Antena Sirkular Untuk Sistem Teleskop Radio Transit

Anwar¹,

Islam

Misran

et al. 2018

JETT

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Susunan antena sirkular telah digunakan pada berbagai aplikasi, termasuk untuk system telekomunikasi dan dalam sistem teleskop radio. Artikel ini membahas pengaruh elemen sentral pada lebar berkas susunan antena sirkular untuk sistem teleskop radio transit. Analisis ini diperoleh dari simulasi dan dibandingkan dengan model teoritis sistem susunan antena 2-elemen dari pekerjaan sebelumnya. Hasil percobaan menunjukkan bahwa sistem susunan antena dengan elemen sentral memiliki lebar berkas yang lebih lebar dibandingkan dengan susunan antena tanpa elemen pusat, dengan intensitas side lobe yang lebih rendah. Karakteristik ini cocok untuk susunan antena yang akan diimplementasikan dalam sistem teleskop radio transit.

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“…Consider uniform circular array (UCA) [26] of antenna configuration at each SU-TX. Then, v k (θ, φ) is the steering vector for the kth SU-TX, which indicates the relative responses of the isotropic array elements with respect to the signal impinging at the center of the array from a particular direction.…”

Section: A Signal Modelmentioning

confidence: 99%

Joint Beamforming, Power, and Channel Allocation in Multiuser and Multichannel Underlay MISO Cognitive Radio Networks

Dadallage

Cai

2016

IEEE Trans. Veh. Technol.

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In this paper, we consider a joint beamforming, power, and channel allocation in a multi-user and multi-channel underlay multiple input single output (MISO) cognitive radio network (CRN). In this system, primary users' (PUs') spectrum can be reused by the secondary user transmitters (SUTXs) to maximize the spectrum utilization while the intra-user interference is minimized by implementing beamforming at each SU-TX. After formulating the joint optimization problem as a non-convex, mixed integer nonlinear programming (MINLP) problem, we propose a solution which consists of two stages. In the first stage, a feasible solution for power allocation and beamforming vectors is derived under a given channel allocation by converting the original problem into a convex form with an introduced optimal auxiliary variable and semidefinite relaxation (SDR) approach. After that, in the second stage, two explicit searching algorithms, i.e., genetic algorithm (GA) and simulated annealing (SA)-based algorithm, are proposed to determine suboptimal channel allocations. Simulation results show that beamforming, power and channel allocation with SA (BPCA-SA) algorithm can achieve close-to-optimal sum-rate while having a lower computational complexity compared with beamforming, power and channel allocation with GA (BPCA-GA) algorithm. Furthermore, our proposed allocation scheme has significant improvement in achievable sum-rate compared to the existing zero-forcing beamforming (ZFBF).

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Uniform circular arrays for phased array antenna

Cited by 43 publications

References 16 publications

Direction of Arrival Estimation of GPS Narrowband Jammers Using High-Resolution Techniques

Direction of Arrival Estimation of GPS Narrowband Jammers Using High-Resolution Techniques

Pengaruh Elemen Sentral Pada Susunan Antena Sirkular Untuk Sistem Teleskop Radio Transit

Joint Beamforming, Power, and Channel Allocation in Multiuser and Multichannel Underlay MISO Cognitive Radio Networks

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