Frequency Diverse Array Radar With Logarithmically Increasing Frequency Offset

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

doi:10.1109/lawp.2014.2368977

Cited by 279 publications

(181 citation statements)

References 8 publications

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“…The beam pattern towards the desired target can be approximated as the magnitude squared of the array factor [9] and is given by: Here the array elements are N = 11 and the interelement distance is taken as A / 2 to avoid the grating lobes in angle dimensions. Since, the angle dimension does not change due to non-uniform frequency offsets, therefore only the range dimension results have been plotted and compared.…”

Section: B Transmit Beam/armingmentioning

confidence: 99%

“…Likewise, the interelement spacing of FDA, proportional to the wavelength was studied in [8]. Uniform linear array with logarithmically increasing inter-element frequency offset has been presented 978-1-4673-8753-8/16/$31 .00 ©2016 IEEE in [9] , which generates a single-maximum beam pattern for an arbitrary value of frequency offset and also suppresses interferences. However, all of these FDA based schemes result in broadening of half power beam width (HPBW).…”

Section: Introductionmentioning

confidence: 99%

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Beam sharpening of a range-angle-dependent pattern using non-uniform symmetric but integer frequency offset

Basit

Qureshi

Malik

et al. 2016

2016 International Conference on Intelligent Systems Engineering (ICISE)

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A uniform inter-element frequency offset for a frequency diverse array (FDA) radar generates a range-angle dependent beam pattern that causes broadening of half power beam width (HPBW). Certainly, this broadening of the main beam is undesirable due to the fact that it decreases the maximum reachable range and at the same time it allows interferes to affect the target-returns. Therefore, it not only results in weakening the signal to interference noise ratio (SINR), but also does not facilitate to distinguish between targets that are very close in range. In this letter, a uniformly-spaced FDA with non-uniform integer frequency offsets has been proposed. The proposed design avoids the broadening of main beam and hence provides a better range resolution as compared to the previous designs. Likewise, symmetrical frequency offset selection scheme achieve better null depths than that of non-symmetric. The usefulness of the proposed method is validated in simulations.Index Terms-frequency diverse array, non-uniform frequency offset, range-angle dependent beam forming

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Section: B Transmit Beam/armingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beam sharpening of a range-angle-dependent pattern using non-uniform symmetric but integer frequency offset

Basit

Qureshi

Malik

et al. 2016

2016 International Conference on Intelligent Systems Engineering (ICISE)

Self Cite

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“…For instance, a joint range-angle estimation algorithm is presented in [7]; a FDA-MIMO Radar with double pulsewas proposed, with the aim ofimproving the range-angle localization of the target [8]. Another popular area of FDA-MIMO Radar research is related to optimizing nonuniform frequency offset to obtain modified range-angle beampattern or better output performance [11,12,13,14,15]. As discussed in [11], the logarithmic frequency offset allows a single maxima for each beam, ensuring that the signal information at the receiver is of better quality.…”

Section: Introductionmentioning

confidence: 99%

An Improved Adaptive Received Beamforming for Nested Frequency Offset and Nested Array FDA-MIMO Radar

Cheng

Zhang

Bian

et al. 2018

Sensors

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For the conventional FDA-MIMO (frequency diversity array multiple-input-multiple-output) Radar with uniform frequency offset and uniform linear array, the DOFs (degrees of freedom) of the adaptive beamformer are limited by the number of elements. A better performance—for example, a better suppression for strong interferences and a more desirable trade-off between the main lobe and side lobe—can be achieved with a greater number of DOFs. In order to obtain larger DOFs, this paper researches the signal model of the FDA-MIMO Radar with nested frequency offset and nested array, then proposes an improved adaptive beamforming method that uses the augmented matrix instead of the covariance matrix to calculate the optimum weight vectors and can be used to improve the output performances of FDA-MIMO Radar with the same element number or reduce the element number while maintain the approximate output performances such as the received beampattern, the main lobe width, side lobe depths and the output SINR (signal-to-interference-noise ratio). The effectiveness of the proposed scheme is verified by simulations.

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“…In this regards, a nonuniform linear array was proposed in [13] to decouple the FDA transmit beampattern, however, the carrier frequency and/or frequency increments cannot be altered in real-time because it requires relocating the elements mechanically. In [14] and [15], logarithmically increasing frequency offsets and time-dependent frequency offsets, respectively are reported to decouple the Figure 1: Illustration of Conventional FDA with linear frequency offsets.…”

Section: Introductionmentioning

confidence: 99%

Transmit / Received Beamforming for Frequency Diverse Array with Symmetrical frequency offsets

Nusenu¹

2017

Adv. sci. technol. eng. syst. j.

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Frequency Diverse Array Radar With Logarithmically Increasing Frequency Offset

Cited by 279 publications

References 8 publications

Beam sharpening of a range-angle-dependent pattern using non-uniform symmetric but integer frequency offset

Beam sharpening of a range-angle-dependent pattern using non-uniform symmetric but integer frequency offset

An Improved Adaptive Received Beamforming for Nested Frequency Offset and Nested Array FDA-MIMO Radar

Transmit / Received Beamforming for Frequency Diverse Array with Symmetrical frequency offsets

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