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DOA Estimation for Multiple Targets in MIMO Radar with Nonorthogonal Signals

Author

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  • Zhenxin Cao
  • Peng Chen
  • Zhimin Chen
  • Yi Jin

Abstract

This paper addresses the direction of arrival (DOA) estimation problem in the colocated multiple-input multiple-output (MIMO) radar with nonorthogonal signals. The maximum number of targets that can be estimated is theoretically derived as , where denotes the number of receiving antennas and is the cross-correlation matrix of the transmitted signals. Therefore, with the rank-deficient cross-correlation matrix, the maximum number that can be estimated is less than the radar with orthogonal signals. Then, a multiple signal classification- (MUSIC-) based algorithm is given for the nonorthogonal signals. Furthermore, the DOA estimation performance is also theoretically analyzed by the Carmér-Rao lower bound. Simulation results show that the nonorthogonality degrades the DOA estimation performance only in the scenario with the rank-deficient cross-correlation matrix.

Suggested Citation

  • Zhenxin Cao & Peng Chen & Zhimin Chen & Yi Jin, 2018. "DOA Estimation for Multiple Targets in MIMO Radar with Nonorthogonal Signals," Mathematical Problems in Engineering, Hindawi, vol. 2018, pages 1-7, July.
    • Handle: RePEc:hin:jnlmpe:6465856
    DOI: 10.1155/2018/6465856
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