Enhancing Angle-of-Arrival (AoA) Estimation in a Radar System Through an Additional Antenna Array Sharing the Same Receiver Channels

This study proposes an innovative system concept for automotive radar antenna arrays, employing dual frequency bands to power two separate antenna systems from a common monolithic microwave integrated circuit (MMIC) port. This configuration enables the creation of both dense and sparse arrays or two distinct sets of arrays, enhancing angular accuracy and reducing computational complexity. The dense array disambiguate measurements of the sparse array, providing a larger aperture, while two sparse arrays offer increased accuracy. The system offers both ambiguous and unambiguous measurements capability for determining angle-of-arrival (AoA) of targets, promising significant improvement in angular accuracy with fewer receive channels.