Angular measurement with lens based automotive radar sensors

77 GHz automotive radar sensors based on lens antennas have a high market penetration in the field of driver assistance systems due to their compact and cost effective concept. These kinds of sensors need not only a good field of view but also the possibility to measure angles. In this paper the parameters amplitude and phase in the focal region are discussed for a diffraction dominated system. Special attention is paid to phase differences between the received signals from antennas mounted in the focal region.