Study of composite array for multi-resolution digital beamforming

• Main Author: Cui, Wei
• Other Authors: Lu Yilong
• Format: Final Year Project
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/64248
• Institution: Nanyang Technological University

Digital beamforming, the bridge between antenna technology and digital technology, has been highly recognized in the applications of radar communications, wireless communications, and radio astronomy. Particularly, the adaptive beamformer in digital beamforming is critical in high performance radar systems. A new antenna array configuration multi-resolution composite array (MRCA) is learnt in this project. Inspired by the idea of multiplicative arrays, MRCA is proposed though combining three or more levels of uniform linear arrays, forming the resulted arbitrary linear array. This report presents a study of adaptive beamforming for the arbitrary linear array MRCA via applying the powerful and versatile particle swarm optimization (PSO) algorithm. Breaking the traditional configuration of uniform linear array, the arbitrary linear array with unequal inter element separations can even achieve a better performance with maintaining main beam pattern and bandwidth, and reducing the levels of sidelobes. Numerical experiments for sidelobe suppression and element failure correction have demonstrated that the presented PSO approach is effective for adaptive beamforming. Matlab simulations for nulling and nulling steering, as well as comparisons between uniform linear array and MRCA have illustrated the benefits that MRCA can offer – elements’ numbers reduction, sidelobe suppression, adaptive flexibility and reliable performance. Last but not least, future works on this topic will be discussed for a smooth and consistent further research.