Transactions of Nanjing University of Aeronautics & Astronautics
Special Issue for UAV
Cramer-Rao Bound for 2-D DOA Estimation in MIMO Radar with Uniform Circular Array
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Abstract:
The Cramer-Rao bound (CRB) for two-dimensional (2-D) direction of arrival （DOA） estimation in multiple-input multiple-output (MIMO) radar with uniform circular array (UCA) is studied. Compared with the uniform linear array (ULA), UCA can obtain the similar performance with fewer antennas and can achieve DOA estimation in the range of 360°. This paper investigates the signal model of the MIMO radar with UCA and 2-D DOA estimation with the multiple signal classification (MUSIC) method. The CRB expressions are derived for DOA estimation and the relationship between the CRB and several parameters of the MIMO radar system is discussed. The simulation results show that more antennas and larger radius of the UCA leads to lower CRB and more accurate DOA estimation performance for the monostatic MIMO radar. Also the interference during the 2-D DOA estimation will be well restrained when the number of the transmitting antennas is different from that of the receiving antennas.
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This work was supported by the National Natural Science Foundation of China (Nos.61071163,61071164,61471191) and a project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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