A frequency-division MIMO FMCW radar system using delta-sigma-based transmitters
Sprache des Titels:
Microwave Symposium Digest (MTT), 2014 IEEE MTT-S International
In this paper, we present a system that allows to
realize frequency-division multiplexing multiple-input multiple-output
(MIMO) radars which are based on the frequency-modulated continuous-wave
(FMCW) principle. Multiple frequency-shifted FMCW signals, which can be
separated in the receiver, are used as transmit (TX) signals. The
frequency shifting is implemented using digitally generated sinusoids in
conjunction with delta-sigma-based transmitters. The proposed principle
requires only little adaptions compared to conventional FMCW-setups.
Furthermore a fast Fourier-transform stage, being present in many
conventional FMCW radars, can be used to separate the TX signals leading
to an efficient usage of existing building blocks. Measurements carried
out using a prototype system with 48 MIMO channels demonstrate the
feasibility of the proposed approach.