Frequency Diverse Array Antenna Using Time-Modulated Optimized Frequency Offset to Obtain Time-Invariant Spatial Fine Focusing Beampattern

Yao, A-Min; Fang, Da‐Gang

doi:10.1109/tap.2016.2594075

Cited by 142 publications

(84 citation statements)

References 35 publications

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“…Similarly, if we want to illuminate two regions at the given range the proposed algorithm can also be used. Therefore, in the third simulation, to focus the transmitted power between two regions defined by Θ 2 ∈ [−20, −40] U [20,40] at a range R o = 300km the proposed algorithm is used. Corresponding beampatterns at different time instances can be seen in Fig.13.a-Fig.13.c.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…However, the actual illumination time should start at t = t o so that all the antennas can contribute in the illumination of target. Similarly, the research presented in [16], [17], [20], [21], [31], [32] shows the target illumination with respect to range and angle between t = 0 and t = T , which is again misleading. Similar to t = 0, the choice of t = T is incorrect because if t o is greater than T , the target will not illuminate.…”

Section: Signal Modelmentioning

confidence: 96%

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Frequency Diverse Array Radar: New Results and Discrete Fourier Transform Based Beampattern

Zubair

Ahmed

Alouini

2020

IEEE Trans. Signal Process.

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In the phased-array radar (PAR) signals from each antenna are transmitted at the same carrier frequency, which yields narrowly focused only angle dependent beampattern. In contrast, in the frequency-diverse-array (FDA) radar signals from antenna array are generally transmitted at linearly increasing frequencies that yields range, time, and angle dependent beampattern. Reported literature on FDA radar missed the contribution of path-differences in the signal model due to the antenna array elements, which may lead to misleading results. In this work, incorporating missed path-differences, the signal model of FDA radar is corrected. Using the corrected signal model, it is shown that the instantaneous beampattern depends on the number of transmit antenna and average beampattern depends on the product of frequency-offset and pulse-duration. Moreover, to illuminate the desired region-of-interest for longer dwell time, discrete-Fourier-transform based low-complexity algorithm is proposed. In contrast to the conventional FDA radar's 'S' shaped beampattern, the beampattern of the proposed algorithm changes linearly with range. Simulation results compare the performance of our proposed algorithm with the existing ones and show the superiority of our proposed algorithm.Index Terms-Frequency-diverse-array radars, Linear and non-linear frequency offset, Time and range dependent beampattern, Discrete-Fourier-transform.

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Section: Simulation Resultsmentioning

confidence: 99%

Section: Signal Modelmentioning

confidence: 96%

Frequency Diverse Array Radar: New Results and Discrete Fourier Transform Based Beampattern

Zubair

Ahmed

Alouini

2020

IEEE Trans. Signal Process.

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“…In this way, time modulation was applied —together with in-phase and quadrature (I/Q) modulation— to phased arrays in order to generate a scanning beam at the single positive sideband [55]. Time modulation was considered, jointly with retrodirective techniques, to synthesize coaperture antenna arrays [56] and also to obtain time-invariant spatial-fine-focusing beampatterns in frequency diverse arrays [57]. …”

Section: State Of the Artmentioning

confidence: 99%

Time Modulated Arrays: From their Origin to Their Utilization in Wireless Communication Systems

Maneiro-Catoira

Bregáins

García-Naya

et al. 2017

Sensors

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Time-modulated arrays (TMAs) are electromagnetic systems whose radiated power pattern is controlled by the application of variable-width periodical pulses to the individual elements. The nonlinear nature of the array operation causes the appearance of radiation patterns at the harmonic frequencies of such periodic pulses. The technique can be used for improving the side-lobe level (SLL) topology of the radiation pattern at the central frequency and/or to profitably exploit the harmonic patterns in order to supply smart antenna capabilities. Among the latter features, the TMA harmonic beamforming takes on special importance due to its attractive trade-off performance-hardware complexity. From this perspective, TMAs are sensors capable of transforming the spatial diversity of a communication channel into frequency diversity, thus improving the performance of a wireless communication. In addition to a walk through the origins of the concept, and a brief analysis of the mathematical fundamentals, this paper organizes the prolific state of the art of TMAs in two major thematic blocks: (1) TMA design from an antenna perspective; and (2) TMA design from a signal processing perspective.

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“…Many studies about FDA have been presented in recent years [8][9][10][11][12][13][14][15][16][17]. Many researchers take their exploration in getting rid of the disadvantages of FDA beampattern such as range-angle coupling [18][19][20] and time-variant [21,22]. Taking use of the range-angle property, many methods are proposed for the FDA in range-angle two-dimensional localization [23,24] and mainlobe deceptive jamming suppression [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…To achieve a time-invariant beampattern, an approach for the FDA which uses time-dependent frequency offset (TDFO) is presented [21]. In [22], a FDA scheme using time-modulated optimized frequency offset (TMOFO) is proposed to realize time-invariant spatial fine focusing beampatterns. For target range-angle localization, a localization system which combines subarray-based FDA and full-band FDA is proposed [23].…”

Section: Introductionmentioning

confidence: 99%

FDA-MIMO Beampattern Synthesis with Hamming Window Weighted Linear Frequency Increments

Tan

Wang

Yuan

et al. 2020

International Journal of Aerospace Engineering

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By utilizing a tiny frequency increment across the array elements, frequency diverse array (FDA) generates a beampattern possessing the property of range-angle-dependent. However, the beampattern of the conventional FDA is "S"-shaped, which means it is coupled in range-angle domains, resulting in low target indication accuracy and poor jamming suppression ability. In this paper, taking advantage of multiple-input multiple-output (MIMO) technique and multiple matched filters, a new FDA framework using Hamming window weighted linear frequency increments is proposed. Correct FDA-MIMO framework and multiple matched filters are used to remove the influence of the time parameter. A range-angle-decoupled beampattern with sharp pencil-shaped mainlobe and low sidelobe levels can be produced. Comparing with the existing FDA-decoupled transmit beampattern design methods, a more focusing beampattern can be achieved. Simulation results validate the superiority of the proposed system.

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Frequency Diverse Array Antenna Using Time-Modulated Optimized Frequency Offset to Obtain Time-Invariant Spatial Fine Focusing Beampattern

Cited by 142 publications

References 35 publications

Frequency Diverse Array Radar: New Results and Discrete Fourier Transform Based Beampattern

Frequency Diverse Array Radar: New Results and Discrete Fourier Transform Based Beampattern

Time Modulated Arrays: From their Origin to Their Utilization in Wireless Communication Systems

FDA-MIMO Beampattern Synthesis with Hamming Window Weighted Linear Frequency Increments

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