scholarly journals Time‐variant focusing range‐angle dependent beampattern synthesis by uniform circular frequency diverse array radar

2020 ◽  
Vol 15 (1) ◽  
pp. 62-74
Author(s):  
Zeeshan Ahmad ◽  
Zhiguo Shi ◽  
Chengwei Zhou
Keyword(s):  
Circular Frequency ◽  
Frequency Diverse Array ◽  
Beampattern Synthesis

Quasi-Time-Invariant 3-D Focusing Beampattern Synthesis for Conformal Frequency Diverse Array

2020 ◽  
Vol 68 (4) ◽  
pp. 2684-2697 ◽  
Author(s):  
Wen Tao Li ◽  
Can Cui ◽  
Xiu Tiao Ye ◽  
Xiao Wei Shi ◽  
Hing Cheung So
Keyword(s):  
Frequency Diverse Array ◽  
Beampattern Synthesis ◽  
Time Invariant

scholarly journals Beampattern analysis of frequency diverse array radar: a review

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Zeeshan Ahmad ◽  
Meng Chen ◽  
Shu-Di Bao
Keyword(s):  
Communication Systems ◽  
Essential Feature ◽  
Beam Steering ◽  
Frequency Offset ◽  
Wireless Communication Systems ◽  
Electronic Beam Steering ◽  
Potential Applications ◽  
Frequency Offsets ◽  
Frequency Diverse Array ◽  
Beampattern Synthesis

AbstractElectronic beam steering is an essential feature of state-of-the-art radar systems. Conventional phased array (PA) radars with fixed carrier frequencies are well-known for electronically steering their beam with high directivity. However, the resulting beampattern is angle-dependent but range-independent. Recently, a new electronic beam steering concept, referred to as frequency diverse array (FDA) radar, has attracted increasing attention due to its unique range-angle dependent beampattern. More importantly, the FDA radar employs a small frequency increment across the array elements to achieve beam steering as a function of angle, range, and time. In this paper, we review the development of the FDA radar since its inception in 2006. Since the frequency offset attaches great importance in FDAs to determine the beampattern shape, initially much of the research and development were focused on designing the optimal frequency offsets for improved beampattern synthesis. Specifically, we analyze characteristics of the FDA beampattern synthesis using various frequency offsets. In addition to analyzing the FDA beampattern characteristics, this study also focuses on the neglected propagation process of the transmitted signals in the early FDA literature, and discuss the time-variant perspective of FDA beampatterns. Furthermore, FDA can also play a significant role in wireless communications, owing to its potential advantages over the conventional PAs. Therefore, we highlight its potential applications in wireless communication systems. Numerical simulations are implemented to illustrate the FDA beampattern characteristics with various frequency offset functions.

scholarly journals FDA-MIMO Beampattern Synthesis with Hamming Window Weighted Linear Frequency Increments

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Ming Tan ◽  
Chunyang Wang ◽  
Hui Yuan ◽  
Juan Bai ◽  
Lei An
Keyword(s):  
Multiple Input Multiple Output ◽  
Time Parameter ◽  
Matched Filters ◽  
Linear Frequency ◽  
Low Sidelobe ◽  
Multiple Input ◽  
Input Multiple Output ◽  
Frequency Diverse Array ◽  
Simulation Results ◽  
Beampattern Synthesis

By utilizing a tiny frequency increment across the array elements, frequency diverse array (FDA) generates a beampattern possessing the property of range-angle-dependent. However, the beampattern of the conventional FDA is “S”-shaped, which means it is coupled in range-angle domains, resulting in low target indication accuracy and poor jamming suppression ability. In this paper, taking advantage of multiple-input multiple-output (MIMO) technique and multiple matched filters, a new FDA framework using Hamming window weighted linear frequency increments is proposed. Correct FDA-MIMO framework and multiple matched filters are used to remove the influence of the time parameter. A range-angle-decoupled beampattern with sharp pencil-shaped mainlobe and low sidelobe levels can be produced. Comparing with the existing FDA-decoupled transmit beampattern design methods, a more focusing beampattern can be achieved. Simulation results validate the superiority of the proposed system.

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