Phase Difference based Doppler Disambiguation Method for TDM-MIMOFMCW Radars

TL;DR

This paper introduces a phase difference based Doppler disambiguation technique for TDM-MIMO radars that restores the maximum unambiguous Doppler to levels comparable to single-transmitter systems, especially effective with many transmitters.

Contribution

It proposes a novel phase difference based method to overcome Doppler ambiguity in TDM-MIMO radars, enhancing their velocity measurement capabilities.

Findings

Method effectively restores maximum unambiguous Doppler in simulations.

Demonstrated success with measurement data.

Works well with a large number of transmitters.

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.