Frequency-modulated diverse array transmit beamforming with bat metaheuristic optimisation

• Published in: IET radar, sonar & navigation Vol. 14; no. 9; pp. 1338 - 1342
• Main Authors: Yaw Nusenu, Shaddrack, Basit, Abdul
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.09.2020
• Subjects: amplitude weighting; array signal processing; bat algorithm FDA array technology; bat metaheuristic algorithm‐based synthesis technique; bat metaheuristic optimisation; FDA angle–range beamforming; FM radar; frequency increment techniques; frequency‐modulated diverse array transmit beamforming; optimisation; phase weighting; radar signal processing; radar systems; radar transmitters; Research Article; time‐dependent beamforming; radar transmitters; bat metaheuristic optimisation; frequency-modulated diverse array transmit beamforming; radar systems; FDA angle–range beamforming; FM radar; bat algorithm FDA array technology; radar signal processing; optimisation; amplitude weighting; bat metaheuristic algorithm-based synthesis technique; time-dependent beamforming; phase weighting; frequency increment techniques; array signal processing
• ISSN: 1751-8784; 1751-8792; 1751-8792
• DOI: 10.1049/iet-rsn.2019.0629

Frequency diverse array (FDA) as a new array technology with range-, angle- and time-dependent beamforming has received much attention, especially in the application of radar systems. In FDA, the element indices employed frequency increments to produce angle–range beamforming. This study proposes bat metaheuristic algorithm-based synthesis technique to uncouple the FDA angle–range beamforming. Specifically, the authors optimise the frequency increment, amplitude weighting and phase weighting with bat metaheuristic algorithm to obtain single-dot and multi-dot shape transmit beamforming. In addition, they take into account the real scenario, i.e. the propagation time of the radiated signal arriving at the target position. It is demonstrated that the proposed bat algorithm FDA achieves more focused beamforming (i.e. narrower mainlobe) and better sidelobes levels (peak to sidelobe ratio) compared to other frequency increment techniques in the literature.