Compensation of Motion-Induced Phase Errors in TDM MIMO Radars

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Abstract
For high-resolution direction of arrival estimation, a wide aperture is necessary. This can be achieved with multiple-input multiple-output radars, which offer a wide virtual aperture. However, the requirement of orthogonal transmit signals has to be satisfied for their operation. Although time division multiplexing of the transmit elements is an orthogonality realization with low hardware effort, phase errors occur in nonstationary scenarios. This letter briefly discusses the problem of the motion-induced phase errors and describes processing steps to mitigate them without additional effort. The proposed technique is demonstrated with simulation and measurement data.