DOA estimation method for multi-path targets based on TR MIMO radar

Abstract

To reduce the large errors for direction of arrival (DOA) estimation in the multipath condition, a DOA estimation method for multipath targets based on time reversal (TR) multi-input multi-output (MIMO) radar is proposed. First, the proposed algorithm combines the focusing characteristic of TR technology with the waveform diversity and symmetry characteristic of MIMO radar, obtaining the virtual sub-arrays of echo signal. Then, the authors multiplex the rows and columns and apply forward–backward spatial smoothing algorithm to remove the coherence of the virtual sub-arrays, effectively improving the DOA estimation accuracy for multipath targets. Simulation results verify the validity of the proposed method.

Keywords

• radar tracking
• MIMO radar
• direction-of-arrival estimation
• DOA estimation accuracy
• forward–backward spatial smoothing algorithm
• virtual sub-arrays
• symmetry characteristic
• waveform diversity
• TR technology
• focusing characteristic
• time reversal multiinput multioutput radar
• multipath condition
• arrival estimation
• TR MIMO radar
• multipath targets
• DOA estimation method