Frequency Diverse Array Transmit Beampattern Optimization With Genetic Algorithm

International Journal of Antennas and Propagation

et al. 2018

Unlike phased array bringing angle-dependent and range-independent beamforming, a new kind of radar system called frequency diverse array (FDA) has been widely used for its ability to generate angle-range-dependent beampattern, which provides a broad prospect of radar application. Nevertheless, FDA beampattern is coupling in the angle and range responses, which results in the difficulty for FDA to differentiate the target in two domains simultaneously. In this paper, a stepped frequency pulse FDA (SFP-FDA) radar is proposed to wipe off the angle-range coupling in FDA and improve the target’s angle and range localization accuracy. Compared to the double-pulse FDA, the proposed system can achieve a better performance in range resolution and multitarget identification. The Cramér-Rao lower bound (CRLB) is derived and used to analyze the performance of the proposed system and double-pulse FDA radar. Numerical results are implemented to verify the validity of the proposed scheme.

Section: International Journal Of Antennas and Propagationmentioning

confidence: 83%

“…To realize low probability of intercept, the cognitive FDA MIMO radar is presented in [24]. Global optimization algorithm like genetic algorithm is discussed to generate a thumbtack-shaped beampattern [25]. A multicarrier nonlinear frequency modulation FDA system based on pseudorandom frequency offset is presented in [26].…”

Section: Introductionmentioning

confidence: 99%

Stepped Frequency Pulse Frequency Diverse Array Radar for Target Localization in Angle and Range Domains

Tan

International Journal of Antennas and Propagation

et al. 2018

“…According to (15), the natural logarithm formula of likelihood function is expressed as ln p (x|r, u, A)…”

Section: Crlbmentioning

confidence: 99%

“…On this basis, many approaches have been proposed which can be divided into two categories. One category is to design the frequency increment or transmit weight, such as logarithmical frequency increment [10][11][12], window-based frequency increment [13], coding modulated frequency increment [14], optimized frequency increment by Genetic algorithm [15] and optimized transmit weight by compression sensing [16,17]. However, the beampatterns of such approaches are subject to quantization error.…”

Section: Introductionmentioning

confidence: 99%

A Novel Transmit–Receive System of Frequency Diverse Array Radar for Multitarget Localization

Liu

et al. 2018

Electronics

The frequency diverse array (FDA) has drawn substantial attention because it provides a new degree of freedom. However, the multitarget localization is fundamentally limited by the range-angle-coupled and range-periodic beampattern of the basic FDA. It has been suggested to design a special FDA configuration to localize targets, but seldom of the existing works consider the design both in transmitting and receiving. In this paper, a transmit–receive system of FDA radar is proposed for the multitarget localization. In order to decouple the beampattern in the range and angle domains, the configurations of subarray-based FDA (SB-FDA) and full-band FDA (FB-FDA) are chosen as transmitter and receiver, respectively. In such a system framework, the receive beamwidth in range domain is only a quarter of the transmission. Then, two typical multitarget scenarios, sparse targets and unresolved targets, are both considered in the multitarget localization. For sparse targets, a proper frequency increment is selected to control the range-periodic transmit and receive mainlobes to focus on a single target, besides being staggered with others. In this way, multitarget localization is achieved in different pulses with monopulse processing. For unresolved targets, a method of intra-pulse beam scanning is proposed to localize each target with little interference from others. We also analyze the system performance in Cramér-Rao lower bound (CRLB) of localization and output signal to interference-plus-noise ratio (SINR). Several simulation results demonstrate the effectiveness of the proposed transmit–receive system in multitarget localization.

“…The authors in [7] proposed the random frequency diverse array for uncoupled range-angle indication in active sensing. A focused beampattern synthesis was put forward in [8] by optimizing the frequency increments with the genetic algorithm, where both single-dot and multidot-shaped transmit beampatterns can be synthesized. Recently, the work in [9] reviewed the developments of the FDA technology.…”

Section: Introductionmentioning

confidence: 99%

A Two-Ray Multipath Model for Frequency Diverse Array-Based Directional Modulation in MISOME Wiretap Channels

Cheng

Fusco

2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)

et al. 2019

A two-ray multipath model for frequency diverse array (FDA)-based directional modulation (DM) is proposed in multi-input single-output multi-eavesdropper (MISOME) wiretap channels for the first time. The excitation factors of the FDA and the weighting coefficients of the inserted artificial noise (AN) are jointly designed in a way which imposes no impact on the desired receiver while simultaneously distorting the received signals of eavesdroppers. Secrecy rate is analyzed for the proposed two-ray multipath FDA-based DM model. Numerical simulations verify the capability of physical layer secure (PLS) transmissions of the proposed FDA-DM model in two-ray multipath MISOME wiretap channels.