Lens based 77 GHz TDM MIMO radar sensor for angular estimation in multitarget environments

The demanding tasks for automotive radar systems in multi target scenarios require an increased target separation performance and new sensor concepts. In this paper a highly integrated 77 GHz TDM MIMO radar is presented. The sensor is feasible for advanced DOA estimation in azimuth and elevation. For efficient and high quality measurements a fractional-n PLL with integrated waveform generator, enabling chirp and FMCW modulations, is implemented. Spatial beamforming is done with series feed array patch antennas in combination with a dielectric cylindrical lens. Due to the usage of switchable MIMO techniques the sensor performance can be significantly increased.