In this work a multimode-beamforming 77-GHz frequency-modulated continuous-wave radar system is presented. Four transceiver chips with integrated inphase/quadrature modulators in the transmit path are used in order to simultaneously realize a short-range frequency-division multiple-access (FDMA) multiple-input multiple-output (MIMO) and a long-range transmit phased-array (PA) radar system with the same antennas. It combines the high angular resolution of FDMA MIMO radars and the high-gain and steerable beam of PA transmit antennas. Several measurements were carried out to show the potential benefits of using this concept for a linear antenna array with four antennas and methods of digital beamforming in the receive path.
[1]
A. Stelzer,et al.
A 77-GHz FMCW MIMO Radar Based on an SiGe Single-Chip Transceiver
,
2009,
IEEE Transactions on Microwave Theory and Techniques.
[2]
A. Stelzer,et al.
An IQ-modulator based heterodyne 77-GHz FMCW colocated MIMO radar system
,
2012,
2012 IEEE/MTT-S International Microwave Symposium Digest.
[3]
J. D. de Wit,et al.
Orthogonal waveforms for FMCW MIMO radar
,
2011,
2011 IEEE RadarCon (RADAR).
[4]
Reinhard Feger,et al.
An IQ-modulator based heterodyne 77-GHz FMCW radar
,
2011,
2011 German Microwave Conference.
[5]
R. Hansen.
Phased Array Antennas
,
2009
.