Volume 12, Number 13, July 2022

Phase Difference based Doppler Disambiguation Method for TDM-MIMOFMCW Radars

  Authors

Qingshan Shen and Qingbo Wang, Nanjing University of Aeronautics and Astronautics, China

  Abstract

State-of-the-art automotive radar sensors use a Mutliple-Input Mutiple-Output (MIMO) approach to obtain a better angular resolution. Time-Division Multiplexing (TDM) scheme is commonly applied to realize the orthogonality in time at the transmitter. Apart from its simplicity in implementation, TDM scheme has the drawback of a reduced maximum unambiguous Doppler proportional to the number of transmitters. In this paper, a phase difference based Doppler disambiguation method is proposed to regain the maximum unambiguous Doppler which is equivalent to only one transmitter. This method works well when the number of transmitters is large. The proposed method is demonstrated with simulation and measurement data.

  Keywords

Doppler disambiguation, TDM, MIMO, FMCW, Phase difference.