Results 251 to 260 of about 519,811 (291)

Energy Focusing through Layout-based Frequency-Diverse Arrays

2019 IEEE Wireless Power Transfer Conference (WPTC), 2019
This paper offers a computationally efficient strategy for the delicate analysis of frequency-diverse arrays. This family of radiating systems shows a radiation mechanism dependent on both angle and range thanks to the different frequency radiated by each array element: for this reason, it can simultaneously focus and steer its beam, thus providing a ...
D. Masotti, M. SHanawani, A. Costanzo
openaire   +2 more sources

Cognitive frequency offset calculation for frequency diverse array radar

2015 12th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 2015
Frequency diverse array (FDA) radars have the ability to generate a beam pattern that is a function of range angle and time. The wavy beam pattern can be controlled by using a suitable frequency increment applied at the input of the array elements. Instead of using fixed frequency increment for FDA, we propose a cognitive frequency offset calculation ...
A. Basit, I.M. Qureshi, W. Khan, S.U. Khan   +3 more
openaire   +1 more source

Frequency Diverse Array Radar With Logarithmically Increasing Frequency Offset

IEEE Antennas and Wireless Propagation Letters, 2015
In recent years, frequency diverse array (FDA) radar with uniform interelement frequency offset has been proposed and investigated. It has been shown that the beampattern of this form of radar is range-angle-dependent, and it exhibits maxima at multiple range values.
Waseem Khan, Ijaz Mansoor Qureshi, Sarah Saeed   +2 more
openaire   +1 more source

Manifold Sensitivity Analysis of Frequency Diverse Array

IEEE Signal Processing Letters, 2020
Frequency diverse array (FDA) is an emerging array technique, its essential array characteristics and corresponding potential applications have not been well studied. As array manifold plays an essential role in various array applications, this letter presents an FDA manifold sensitivity framework to analyze the impact of element position uncertainties.
Tianxing Liao, Wen-Qin Wang, Bang Huang
openaire   +1 more source

Frequency Diverse Array Radar With Time-Dependent Frequency Offset

IEEE Antennas and Wireless Propagation Letters, 2014
In recent years, frequency diverse array radar with fixed frequency offset has been proposed and investigated. It has been shown that the beampattern of this category of radar is time-dependent as well as range-angle-dependent. In this letter, we have proposed time-dependent frequency offset to achieve a beampattern that is time-independent for a given
Waseem Khan, Ijaz Mansoor Qureshi
openaire   +1 more source

Robust Frequency Diverse Array Beamformer via Random Frequency Offset

2019 IEEE International Conference on Signal, Information and Data Processing (ICSIDP), 2019
In this paper, we consider the issues of mainlobe interference and periodic mainlobes in frequency diverse array (FDA) radar. In existing methods for FDA radar with uniform inter-element frequency offset, the beampattern presents multiple peaks in range dimension, which leads to lower energy at target position.
Qiang Li, Lei Huang, Bo Zhao, Min Huang, Peichang Zhang   +4 more
openaire   +1 more source

Frequency Diverse Array Antenna: New Opportunities

IEEE Antennas and Propagation Magazine, 2015
i»?Phased-array antennas are known for their capability to electronically steer a beam with high effectiveness, but beam steering is fixed in an angle for all range cells. This paper reviews frequency diverse array (FDA) antennas. Different from a phased array, an FDA uses a small frequency increment, as compared with the carrier frequency, across ...
openaire   +1 more source

Adaptive Frequency Offset Selection in Frequency Diverse Array Radar

IEEE Antennas and Wireless Propagation Letters, 2014
Frequency diverse array (FDA) can provide a range-angle-dependent beam that can be controlled by using a frequency increment between adjacent elements, but the frequency increment is fixed in a basic FDA, which restraints the performance improvement in different environments significantly.
null Huaizong Shao, null Jingchi Li, null Hui Chen, null Wen-Qin Wang   +3 more
openaire   +1 more source

Frequency Diverse Array Beamforming Using Nonuniform Logarithmic Frequency Increments

IEEE Antennas and Wireless Propagation Letters, 2018
Unlike a conventional phased array that offers directivity only in the angle domain, a frequency diverse array (FDA) is capable of producing a beampattern that is dependent on both angle and range. In this letter, a transmit beamforming method for an FDA is proposed that uses logarithmic frequency increments that have a nonuniform spacing.
Mobeen Mahmood, Hasan Mir
openaire   +1 more source

Frequency Diverse Array Radar Data Processing

2018 International Conference on Radar (RADAR), 2018
The frequency diverse array (FDA) radar has recently been proposed. However, what left behind is how the FDA data should be correctly, efficiently and systematically processed to maximise its full potential and capacity of search and detection. This paper fills the gap.
openaire   +1 more source