Narrow band wide angle scanning circular frequency diverse array radar

Çetiner, Ramazan; Hizal, A.; Tigrek, R. F.

doi:10.23919/eurad.2017.8249189

Cited by 8 publications

(12 citation statements)

References 6 publications

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“…However, here the main concern is focused on designing the transmit scanning arrays. In [30] the same configuration has been used to steer the beam at a specific angle and it has been shown that it has acceptable performance but the performance of the pattern in other angles is not simulated. So, the main challenge of designing the FDA for a stable scanning beam is finding a configuration with a unified angle-changing rate and scan rate for all terms simultaneously.…”

Section: ( )Cos Cosmentioning

confidence: 99%

A Joint Frequency Space Design Approach for Efficient Planar Frequency Diverse Arrays

Hasheminasab

Cheldavi

kishk³

2023

Preprint

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Antenna arrays benefit from spatial diversity, which enables the control of the pattern specifications in space. Adding frequency diversity to arrays provides an opportunity to control the beams in the Space-Time domain. Contrary to the conventional arrays, the added frequency diversity in the Frequency Diverse Arrays (FDA) leads to time-variant and range-dependent patterns. The time variation of the pattern affects both steering and auto-scanning applications. The array factor depends coherently on the frequency and spatial distributions of elements, in the same way, the spatial and time behavior of the FDA’s pattern is correlated. Due to this space-frequency coherency, an adjoint spatial-frequency design algorithm is the best approach for controlling the array's spatial and time behaviors. Although Due to the complexity of the array factor formulations in the FDA, the frequency and spatial distribution of the elements has been separately designed. This study proposes an algorithm to concurrently, allocate the location and frequency of the elements for a desired pattern. First, using some symmetry, a straightforward formulation for the array factor is obtained and used to design a symmetrical FDA for a stable and periodic scanning beam. Second, by analyzing the formulations, two important design parameters and some crucial design criteria of the FDA pattern for scanning applications are suggested, and using these parameters a designing algorithm is extracted. The novelty of the proposed approach is the simultaneous design of the location and frequency of the elements in the space-frequency plane, which results in meeting the time and spatial requirement of the pattern. Using this approach, two different planar arrays are designed, and their results are compared with those of other planar configurations. This study paves the way for a new approach to designing FDAs.

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Section: ( )Cos Cosmentioning

confidence: 99%

A Joint Frequency Space Design Approach for Efficient Planar Frequency Diverse Arrays

Hasheminasab

Cheldavi

kishk³

2023

Preprint

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“…The pattern scanning period for each term is 𝑇 𝑡 = 2/𝛿𝜔 𝑛 𝑖 and the angle-changing rate is obtained from the first time-derivative of the argument in (14). (15) Equation (15) shows the angle-changing rate for each term in the AF.…”

Section: B Equivalent Discular Array Of Undiscular Arraymentioning

confidence: 99%

“…In the previous section, different arrays with different geometry and frequency distribution are simulated, and a comparison is made with the two designed arrays as benchmarks. Table III compares the results of two discular arrays with nonuniform frequency distribution, designed in [9] and [14], with the proposed configurations. Results reveal that the designed discular array performs best among simulated discular arrays.…”

Section: Space-frequency Diagram Of Fdamentioning

confidence: 99%

“…In this study, the frequency offsets for a ring array were uniformly distributed. Later, other frequency distributions like tangent hyperbolic [13] and cosine [14], [15] functions were investigated. Most of the applications in these studies were for radar and beam steering, in which parameters like beamwidth and sidelobes were chosen to compare with different structures.…”

Section: Introductionmentioning

confidence: 99%

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Designing Planar Frequency Diverse Arrays in Space-Frequency Domain

Hasheminasab

Cheldavi²,

kishk³

2022

Preprint

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Antenna arrays benefit from spatial diversity, which allows controlling the pattern specifications in space. Adding frequency diversity to the arrays initiates opportunity to control the beams in the Space-Time domain. Frequency Diverse Array (FDA) has a Range-Angle dependent pattern; therefore, the array's spatial and time behavior should be designed simultaneously for optimum performance. Due to the lack of simple array factor formulations for non-regular configurations, array geometry design has not been the primary concern in many current studies. Due to coherency between frequency and spatial distribution in FDAs, the spatial and time behavior of the pattern is correlated. Frequency diversity of the FDA leads to time-variant beam in steering and auto-scanning beam in CW applications. The present study in addition of SLL discusses two important scanning array parameters; the pattern periodicity and stability in each scan round. In this study using some symmetry rules, a straightforward formulation for the array factor is obtained and used to achieve a stable and periodic scanning beam, suggesting a novel joint space-frequency allocation scheme for the FDA. The approach allows the location and frequency of elements to be designed in the frequency-space plane that minimizes the error function, which is defined based on the time and spatial behavior of the array. Using these concepts, two arrays are designed, and their results are compared with other planar configurations. This study paves the way for a new approach to design FDAs.

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“…In [7], the full-wave analysis of FDA was investigated with finite-difference time-domain method. Another research topic of FDA is to exploit the array geometry characteristics [8]- [10]. Unlike conventional planar phased arrays that allow the synthesis of the far-field radiation patterns as function of the azimuth angle θ and elevation angle φ, the patterns generated by planar FDAs also depend on the range r as well as the time t [5].…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis for Time Modulation-Based Frequency Diverse Array Beampattern

et al. 2019

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Frequency diverse array (FDA) has received much attention due to its both range-and angledependent beampatterns. However, the range-angle coupling and time-variant beampattern in FDA may affect its applicability. In order to address the beampattern range-angle coupling problem and time variance, many existing algorithms, by using the time-modulated optimized frequency offset (TMOFO) scheme, are presented to obtain the spatial-focusing time-invariant transmit beampattern synthesis for the FDA. To discuss their irrationality, we first give a time-modulated optimized weight vector (TMOWV) scheme with frequency offset optimization, which is a more general time-modulated scheme for the FDA beampattern synthesis and more convenient for the statistical analysis of the designed FDA transmit beampattern characteristics. Then, the statistical analysis of the designed FDA transmit beampattern is investigated through both theoretical derivations and numerical examples. The extensive simulation results demonstrate that the time-modulated approach for the time-invariant FDA transmit beampattern is invalid. INDEX TERMS Frequency diverse array, transmit beamforming, time-modulated array, time-variant, beampattern synthesis.

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Narrow band wide angle scanning circular frequency diverse array radar

Cited by 8 publications

References 6 publications

A Joint Frequency Space Design Approach for Efficient Planar Frequency Diverse Arrays

A Joint Frequency Space Design Approach for Efficient Planar Frequency Diverse Arrays

Designing Planar Frequency Diverse Arrays in Space-Frequency Domain

Statistical Analysis for Time Modulation-Based Frequency Diverse Array Beampattern

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