DOA Estimation for Multiple Targets in MIMO Radar with Nonorthogonal Signals

Abstract EN

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 rankRsN, where N denotes the number of receiving antennas and Rs 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.