Range Migration Algorithm Using Doppler-Division Multiplexed Multiple-Input Multiple-Output Imaging

Recently, numerous algorithms for near-field three-dimensional imaging using radar technology have been presented in the field of security. This paper proposes a range migration algorithm (RMA) applied to Doppler-division multiplexed multiple-input multiple-output (DDM-MIMO) synthetic aperture radar imaging for security checkpoints attached to a moving walkway. The proposed algorithm is an extension of the conventional MIMO-RMA method, which originally presupposes time-division multiplexing as a method of transmitting signals from multiple transmitting antennas. It is possible to achieve faster image reconstruction of dangerous objects in combination with DDM-MIMO. The mathematical derivation of the algorithm and its computational complexity compared to the back-projection algorithm are detailed in this study. The details of the numerical simulation of a point target and an experiment with two objects are also presented to verify the performance of the algorithm.