Dot-Shaped Range-Angle Beampattern Synthesis for Frequency Diverse Array

IEEE J. Sel. Top. Signal Process.

Farina³

2017

Self Cite

189

Time and frequency modulated arrays have numerous application areas including radar, navigation and communications. Specifically, a time modulated array can create a beampattern with low sidelobes via connecting and disconnecting the antenna elements from the feed network, while the frequency modulated frequency diverse array produces a range-dependent pattern. In this paper, we aim to introduce these advanced arrays to the signal processing community so that more investigations in terms of theory, methods and applications, can be facilitated. The research progress of time/frequency modulated array studies is reviewed and the most recent advances are discussed. Moreover, potential applications in radar and communications are presented, along with their technical challenges, especially in signal processing aspects.Index Terms-Time modulated array, frequency modulated array, frequency diverse array, array signal processing, phasedarray, range-dependent beamforming, multiple-input multipleoutput (MIMO) radar.

“…Such a dotshaped range-angle beampattern is synthesized in [115] by a symmetrical FDA using multi-carrier frequency increments and convex optimization. As shown in Fig.…”

Section: A Optimal Array Designmentioning

confidence: 99%

An Overview on Time/Frequency Modulated Array Processing

IEEE J. Sel. Top. Signal Process.

Farina³

2017

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189

“…For the multi-target case, the received echo vector for the kth snapshot can then be expressed as (26) where α p (k), r p , and θ p are the reflection coefficient, slant range, and azimuth angle for the pth target at the kth snapshot, respectively, P is the target number, K is the snapshot number, and n(k) is the M × 1 additive receiver noise vector. Note that the target reflection coefficient α p (k) may vary from shapshot to snapshot [31].…”

Section: Fda Radar Using Costas-sequence Modulated Frequency Offsetsmentioning

confidence: 99%

“…In fact, the best decoupling approach is to form a dot-shaped beampattern rather than an "S"-shaped beampattern. Such a dot-shaped range-angle beampattern is synthesized in [26] by a symmetrical FDA using multicarrier frequency offsets and convex optimization, and in [27] by the use of random frequency offsets. Nevertheless, these two schemes are very difficult to implement in practical array systems.…”

Section: Introductionmentioning

confidence: 99%

Range-azimuth decouple beamforming for frequency diverse array with Costas-sequence modulated frequency offsets

EURASIP J. Adv. Signal Process.

Shao

2016

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Different from the phased-array using the same carrier frequency for each transmit element, the frequency diverse array (FDA) uses a small frequency offset across the array elements to produce range-angle-dependent transmit beampattern. FDA radar provides new application capabilities and potentials due to its range-dependent transmit array beampattern, but the FDA using linearly increasing frequency offsets will produce a range and angle coupled transmit beampattern. In order to decouple the range-azimuth beampattern for FDA radar, this paper proposes a uniform linear array (ULA) FDA using Costas-sequence modulated frequency offsets to produce random-like energy distribution in the transmit beampattern and thumbtack transmit-receive beampattern. In doing so, the range and angle of targets can be unambiguously estimated through matched filtering and subspace decomposition algorithms in the receiver signal processor. Moreover, random-like energy distributed beampattern can also be utilized for low probability of intercept (LPI) radar applications. Numerical results show that the proposed scheme outperforms the standard FDA in focusing the transmit energy, especially in the range dimension.

“…A symmetrical FDA beampattern synthesis method using multi-carrier frequency increments and convex optimization in which dot-shaped transmit beampatterns will be achieved for decoupling the range-angle response was investigated in [32].…”

Section: Background and Motivationmentioning

confidence: 99%

Subarray-based FDA radar to counteract deceptive ECM signals

Abdalla

EURASIP J. Adv. Signal Process.

Zhao

et al. 2016

Self Cite

In recent years, the frequency diverse array (FDA) radar concept has attracted extensive attention, as it may benefit from a small frequency increment, compared to the carrier frequency across the array elements and thereby achieve an array factor that is a function of the angle, the time, and the range which is superior to the conventional phase array radar (PAR). However, limited effort on the subject of FDA in electronic countermeasure scenarios, especially in the presence of mainbeam deceptive jamming, has been published. Basic FDA is not desirable for anti-jamming applications, due to the range-angle coupling response of targets. In this paper, a novel method based on subarrayed FDA signal processing is proposed to counteract deceptive ECM signals. We divide the FDA array into multiple subarrays, each of which employs a distinct frequency increment. As a result, in the subarray-based FDA, the desired target can be distinguished at subarray level in joint range-angle-Doppler domain by utilizing the fact that the jammer generates false targets with the same ranges to each subarray without reparations. The performance assessment shows that the proposed solution is effective for deceptive ECM targets suppression. The effectiveness is verified by simulation results.