Overview of frequency diverse array in radar and navigation applications

Wireless communication systems have gained considerable growth rate nowadays, with the anticipation that communications will be available everywhere and anywhere in the near future. Phased array antenna whose beam steering is fixed in an angle for all range cells has been utilized for wireless communications. To mitigate this problem, a new array concept, namely, frequency diverse array (FDA), was proposed. is paper presents how FDA technology could be useful in today's wireless communication technology. FDA is distinct from phased array in a sense that it employs frequency increment across array elements. e use of a frequency increment creates a beam steering that is a function of angle, time, and range which allows the FDA antenna to transmit the energy along the prespecified range and angle direction. In addition, we consider the time-variant beampattern aspect of an FDA, which has normally been ignored in the literature. In this study, we present the mathematical fundamentals of FDA antenna and why it could be exploited for wireless communication systems. Furthermore, FDA using Butler matrix for communication has been discussed. Performance analysis in terms of transmit beampattern, signal-to-interference-and-noise ratio (SINR), and direction of arrival has been presented and compared with that of phased array antenna.

show abstract

“…Consider a number of FDA antenna elements, M, as shown in Figure 1, and the radiation frequency of each element can be given by [19].…”

Section: Mathematical Formulation Of Fda Antennamentioning

confidence: 99%

Frequency Diverse Array Antennas: From Their Origin to Their Application in Wireless Communication Systems

Nusenu

Basit

2018

Journal of Computer Networks and Communications

View full text Add to dashboard Cite

show abstract

“…It is because phased-array transmits a single waveform from all elements and achieves phase-dependent beamforming by applying a linear phase shift across the array. In the overview paper [79], we have defined FDA and explained why it can be exploited for radar and navigation applications. The purpose of this work is on introducing the FDA transmitter and receiver array schemes and structures, and comparing its performance with a phased-array radar.…”

Section: Introductionmentioning

confidence: 99%

An Overview on Time/Frequency Modulated Array Processing

Wang

Farina³

2017

IEEE J. Sel. Top. Signal Process.

192

View full text Add to dashboard Cite

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.

show abstract

“…Basically, FDA employs some small frequency offsets across the antenna array to generate an angle-range dependent beampattern [10]. Current research on FDA mainly focuses on analyzing the anglerange dependent beampattern characteristics, and exploring its application in radar and/or navigation systems [11]- [13]. An orthogonal frequency division multiplexing (OFDM) secure transmit scheme is designed in [14], based on FDA with some given and fixed frequency offsets.…”

Section: Introductionmentioning

confidence: 99%

Frequency diverse array beamforming for physical-layer security with directionally-aligned legitimate user and eavesdropper

Lin

Yang

2017

2017 25th European Signal Processing Conference (EUSIPCO)

View full text Add to dashboard Cite

Abstract-The conventional physical-layer (PHY) security approaches, e.g., transmit beamforming and artificial noise (AN)-based design, may fail when the channels of legitimate user (LU) and eavesdropper (Eve) are close correlated. Due to the highly directional transmission feature of millimeter-wave (mmWave), this may occur in mmWave transmissions as the transmitter, Eve and LU are aligned in the same direction exactly. To handle the PHY security problem with directionally-aligned LU and Eve, we propose a novel frequency diverse array (FDA) beamforming approach to differentiating the LU and Eve. By intentionally introducing some frequency offsets across the antennas, the FDA beamforming generates an angle-range dependent beampattern. As a consequence, it can degrade the Eve's reception and thus achieve PHY security. In this paper, we maximize the secrecy rate by jointly optimizing the frequency offsets and the beamformer. This secrecy rate maximization (SRM) problem is hard to solve due to the tightly coupled variables. Nevertheless, we show that it can be reformulated into a form depending only on the frequency offsets. Building upon this reformulation, we identify some cases where the SRM problem can be optimally solved in closed form. Numerical results demonstrate the efficacy of FDA beamforming in achieving PHY security, even for aligned LU and Eve.

show abstract

Overview of frequency diverse array in radar and navigation applications

Cited by 162 publications

References 106 publications

Frequency Diverse Array Antennas: From Their Origin to Their Application in Wireless Communication Systems

Frequency Diverse Array Antennas: From Their Origin to Their Application in Wireless Communication Systems

An Overview on Time/Frequency Modulated Array Processing

Frequency diverse array beamforming for physical-layer security with directionally-aligned legitimate user and eavesdropper

Contact Info

Product

Resources

About