TY - GEN
T1 - A superdirective beamforming method for linear sensor arrays
AU - Yang, Yixin
AU - Wang, Yong
AU - He, Zhengyao
AU - Ma, Yuanliang
AU - Wang, Honglei
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2014/11/20
Y1 - 2014/11/20
N2 - A general superdirective beamforming method which is suitable for arbitrary-shape sensor arrays is proposed, and its performance for linear arrays is studied in this paper. Based on Gram-Schmidt orthogonalization, the optimal solutions of superdirectivity are all expressed in closed-form without any approximations. The optimal beampattern and the maximum directivity factor are decomposed into mode-beams and their associated directivity factors respectively. For linear arrays, the directivity factor of mode-beam increases as its order number increases, but the robustness decreases. Thus, the robust superdirective beampattern can be easily obtained by adopting a reduced-rank treatment which can remove the error sensitive high order modes and remain robust ones. Simulations and experimental results show the good performance of this approach.
AB - A general superdirective beamforming method which is suitable for arbitrary-shape sensor arrays is proposed, and its performance for linear arrays is studied in this paper. Based on Gram-Schmidt orthogonalization, the optimal solutions of superdirectivity are all expressed in closed-form without any approximations. The optimal beampattern and the maximum directivity factor are decomposed into mode-beams and their associated directivity factors respectively. For linear arrays, the directivity factor of mode-beam increases as its order number increases, but the robustness decreases. Thus, the robust superdirective beampattern can be easily obtained by adopting a reduced-rank treatment which can remove the error sensitive high order modes and remain robust ones. Simulations and experimental results show the good performance of this approach.
KW - GramSchmidt orthogonalization
KW - high-order superdirectivity
KW - linear arrays
KW - optimal beamforming
KW - robustness
UR - https://www.scopus.com/pages/publications/84918491993
U2 - 10.1109/OCEANS-TAIPEI.2014.6964540
DO - 10.1109/OCEANS-TAIPEI.2014.6964540
M3 - 会议稿件
AN - SCOPUS:84918491993
T3 - OCEANS 2014 - TAIPEI
BT - OCEANS 2014 - TAIPEI
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - OCEANS 2014 MTS/IEEE Taipei Conference: Oceans Regeneration
Y2 - 7 April 2014 through 10 April 2014
ER -