An investigation into uniform circular frequency diverse array (UCFDA) radars

Saeed, Sarah O. M.; Qureshi, Ijaz Mansoor; Khan, Waseem S.; Salman, Ayesha

doi:10.1080/2150704x.2015.1069903

Cited by 19 publications

(16 citation statements)

References 5 publications

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“…One can see that in both these figures, maximum is quite narrow along the angles as well as slant range. The sidelobe concentration of the proposed system in linear region is much lower than that of UFCDA proposed in [4].…”

Section: Simulations Results and Discussionmentioning

confidence: 69%

“…However, the logarithmically increasing frequency offset has been applied to linear FDA (LFDA) which fails to provide three‐dimensional (3D) target localisation and also results in beampattern with high sidelobe level concentration widely spread in the visible range. Most recent work in FDA is by Saeed et al [4] where benefits of employing frequency diversity in circular geometries have been explored; however, the work focuses on linear frequency offset.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand CFDA, as compared with LFDA, offers 3D target localisation capability, i.e. in range R , elevation θ and azimuthal angle φ [4]. The ‘s’ shaped patterns of LFDA have infinite ( R , θ ) pairs of maximum field.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Tangent hyperbolic circular frequency diverse array radars

Saeed

Qureshi

Khan

et al. 2016

J. eng.

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Section: Simulations Results and Discussionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

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Tangent hyperbolic circular frequency diverse array radars

Saeed

Qureshi

Khan

et al. 2016

J. eng.

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“…Assume a uniform circular array (UCA) composed of M omni‐directional elements with radius a as shown in Figure 2. The slant range with respect to the m ‐th element is given as [35].

r_{m} ≅ r - a \sin θ \cos (φ - φ_{m}),

where φ is the azimuth angle, and

φ_{m} = \frac{2 π m}{M}

.…”

Section: Basic Fda Radar and Problem Preliminariesmentioning

confidence: 99%

Time‐variant focusing range‐angle dependent beampattern synthesis by uniform circular frequency diverse array radar

Ahmad

Shi

Zhou

2020

IET Radar Sonar & Navi

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The beam steering of phased array (PA) radar is fixed in one direction for all the ranges, thus the resulting beampattern is angle‐dependent but range‐independent. Compared with the PA radar, the frequency diverse array (FDA) radar can achieve range‐angle dependent beampattern by employing a small frequency increment across the array elements. Numerous studies have been conducted using linear FDAs, while other array configurations are seldom studied. On the other hand, the range‐angle dependent beampattern generated by the FDA is also time‐variant. However, previous studies on time‐invariant spatial‐focusing FDA beampatterns neglected the propagation process of the transmitted signals, leading the focused beampattern difficult to achieve when the transmit delay caused by wave propagation is considered. Taking the time‐variant property of the FDA beampatterns into consideration, in this study, we propose a novel uniform circular FDA (UC‐FDA) radar for short‐range beampattern synthesis. The UC‐FDA radar has the ability to scan azimuthally through 360°, which is a potential solution for applications requiring three‐dimensional beam steering. Furthermore, the proposed UC‐FDA radar adopts a pulse‐dependent non‐linear frequency offsets based on logistic map, together with multi‐carrier technique to achieve a dot‐shaped time‐variant focusing beampattern with minimum sidelobe levels and high‐resolution. The effectiveness of the proposed UC‐FDA radar is validated with simulated experiments.

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“…The beam pattern analysis of planer FDA design has been presented in [122], where it was shown that planer FDA provides better directionality and higher gain when compared with conventional FDA radar. Moreover, the circular FDA geometries were deeply studied in [123], where theory, basic analysis and beam steering for uniform circular FDA was presented to get the advantages of better spatial resolutions. Moreover, non‐uniform frequency offsets based on tangent hyperbolic function were applied to this uniform circular FDA, where beam patterns of three different configurations of an FDA can be generated, just by adjusting a single function parameter of the tangent hyperbolic function in order to get enhanced system detection capability and signal‐to‐interference plus noise ratio [124].…”

Section: Fda Radarmentioning

confidence: 99%