Direction-of-Arrival Estimation in Conformal Microstrip Patch Array Antenna

Mohammadi, Sirous; Ghani, Armin; Sedighy, Seyed Hassan

doi:10.1109/tap.2017.2772085

Cited by 40 publications

(25 citation statements)

References 14 publications

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“…c ∈ [0, π/2] and η ∈ [− π, π] are defined to characterize the respective amplitude ratio and the phase difference between the two polarization components, respectively. Combining formulas (17)- (19), the following equation can be derived…”

Section: Signal Modelmentioning

confidence: 99%

See 1 more Smart Citation

Polarization and DOA Estimation Based on Dual-Polarized Conformal Array

Liu

Xiang

et al. 2019

International Journal of Antennas and Propagation

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A dual-polarized multiple signal classification (DP-MUSIC) algorithm is presented to estimate the arrival directions and polarizations for a dual-polarized conformal array. Each polarization signal is decomposed into two orthogonal polarization components, which are considered to be a pair of coherent signals coming from the same direction but different polarization. The polarization parameters are modeled as the equivalent coherence coefficients of the orthogonal polarization components. Then, the method of decoherence can be used to decouple the information of polarization states and signal angles. After that, the direction of arrival (DOA) and polarization parameters can be estimated by the DP-MUSIC algorithm. Moreover, the angles of incident direction are re-estimated, which greatly improves the accuracy of DOA estimation. The Cramer–Rao bound (CRB) is derived and the effectiveness of the proposed algorithm is verified by Monte Carlo simulations.

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Section: Signal Modelmentioning

confidence: 99%

“…In order to measure the performance of the DP-MUSIC algorithm, the estimation CRB for the dual-polarized conformal array is derived here. e signal model expressed in formula (22) should be converted into a discrete time digital domain, and the probability distribution function (PDF) of L samples is [19]…”

Section: Cramer-rao Boundmentioning

confidence: 99%

Polarization and DOA Estimation Based on Dual-Polarized Conformal Array

Liu

Xiang

et al. 2019

International Journal of Antennas and Propagation

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“…References and are the most recent works which study the accuracy of DOA estimation by involving the impact of the antenna radiation pattern.…”

Section: Introductionmentioning

confidence: 99%

“…In Reference , the effect of directional antenna elements in UCAs for DOA estimation is studied and Reference provides a new structure for DOA estimation by designing a two‐face conformal array structure. Then, by changing the tilt angle of antenna array structure, four different structures are produced and DOA estimation accuracy of each structure is examined using the multiple signal classification (MUSIC) and Cramer‐Rao lower bound (CRLB) algorithms.…”

Section: Introductionmentioning

confidence: 99%

Near optimal conformal antenna array structure for direction‐of‐arrival estimation

Sharifi

Rezaei

2019

Int J RF Microw Comput Aided Eng

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This article determines the near optimal conformal antenna array structure for direction‐of‐arrival (DOA) estimation through a comprehensive study on the planar and usual conformal antenna arrays including the cylindrical and hemispherical by using the directive antenna elements in all designs. To model the hemispherical structure, an improved multi‐face antenna array with three different tilts is proposed and compared with previous works in order to investigate the tilt effect and obtain the conclusive results. The Cramer‐Rao lower bound, multiple signal classification, and root‐mean‐square error algorithms are utilized to evaluate the estimation accuracy of all conformal structures. Finally, by comparing the estimation precision of all conformal structures it is shown that the purposed multi‐face structure as the hemispherical model has a better performance than other conformal structures in terms of the maximum angular coverage of the spatial resource. Moreover, the proposed study method in this article fully examines the impacts of the different conformal antennas geometric structure on the DOA estimation performance by involving the directive antennas radiation patterns.

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“…In papers [11,12], the problem of obtaining the Cramer-Rao lower bound for the azimuth and elevation DOA-estimation using antenna arrays with directional elements is considered. However, these works do not give an exact expression taking into account the position of the source together with the directivity factor of each antenna element.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Minimization of Cramer-Rao Bound for Conformal Antenna Arrays With Directional Emitters for Doa-Estimation

Nechaev¹,

Peshkov²,

Fortunova³

2019

PIER C

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The Cramer-Rao lower bound (CRLB) for calculating errors and accuracy of direction-ofarrival (DOA) estimation is discussed for a number of planar waves arriving on an antenna array. It is well known that the geometry of antenna arrays imposes restrictions on the performances of the direction-of-arrival estimation. In particular, the influence of the directivity factor of the individual antenna elements on the accuracy of the DOA estimation of the radio emission sources for circular (cylindrical), cubic and spherical antenna arrays consisting of the directional antenna elements is investigated. The directivity factor of antenna elements is changed within wide limits in order to determine the values at which the high accuracy of the direction-finding can be achieved. It is shown that further increasing the directivity factor of each antenna element makes the mean square error in the determination of the coordinates of the signals increase as well. The exact expression for the Cramer-Rao lower bound for the DOA-estimation variance calculation depending on the antenna directivity and the geometry is presented. The obtained exact equation shows the most important factors that the direction-of-arrival estimation accuracy is dependent on. A technique of obtaining antenna arrays with optimal directional elements locations is proposed. Those arrays allow increasing DOA estimation accuracy by several times.

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Direction-of-Arrival Estimation in Conformal Microstrip Patch Array Antenna

Cited by 40 publications

References 14 publications

Polarization and DOA Estimation Based on Dual-Polarized Conformal Array

Polarization and DOA Estimation Based on Dual-Polarized Conformal Array

Near optimal conformal antenna array structure for direction‐of‐arrival estimation

Evaluation and Minimization of Cramer-Rao Bound for Conformal Antenna Arrays With Directional Emitters for Doa-Estimation

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