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International Journal of Antennas and Propagation
Volume 2016, Article ID 1512843, 10 pages
Research Article

MIMO Radar Transmit Beampattern Design for DOA Estimation with Sidelobe Suppression

1Zhengzhou Information Science and Technology Institute, Zhengzhou, Henan 86-450002, China
2China National Digital Switching System Engineering and Technological Research Center, Zhengzhou, Henan 86-450002, China

Received 27 October 2015; Accepted 14 January 2016

Academic Editor: Renato Cicchetti

Copyright © 2016 Yuxiang Li et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We address the problem of transmit beamspace design for multiple-input multiple-output (MIMO) radar with colocated antennas in direction-of-arrival (DOA) estimation application. Three transmit beampattern sidelobe suppression strategies for designing the transmit beamspace matrix are introduced. The design of transmit beamspace matrix is based on minimizing the difference between a desired transmit beampattern and the actual one while keeping the sidelobe levels under control. Uniform elemental power distribution across the transmit antenna is guaranteed; at the same time, signal rotational invariance property is considered, which enables search-free based DOA estimation algorithms to be utilized at the receiver. The proposed optimization problems are nonconvex and are solved by using semidefinite programming relaxation technique. Moreover, the DOA estimation Cramer-Rao bound with transmit beamspace matrix is discussed. Simulation results show the superiority of the proposed techniques over the existing methods.