Radar system with sequential two-dimensional angle estimation

Non-transitory computer-readable storage media comprising computer-executable instructions that, when executed, cause a processor of a radar system to:

• receive, by an antenna of the radar system, electromagnetic (EM) energy reflected by one or more objects;
• determine, using the EM energy received by a two-dimensional (2D) array of the antenna, first angles associated with one or more detections of one or more objects, the 2D array comprising at least four antenna elements positioned in a first dimension and a second dimension, the first angles being in the first dimension;
• for each respective first angle of the first angles:
• steer the 2D array to the respective first angle to generate a steered 1D array by projecting the 2D array onto a subspace formed by a first-dimension steering vector associated with the respective first angle, determining a projection matrix associated with the subspace formed by the first-dimension steering vector, and determining second-dimension information associated with the respective first angle based on the projection matrix associated with the subspace formed by the first-dimension steering vector, the second-dimension information being used to determine the second angles associated with the respective first angle;
• and determine, based on the steered 1D array, second angles associated with the one or more detections, the second angles being in the second dimension and associated with the respective first angle.

A method comprising:

• receiving, by an antenna of a radar system, electromagnetic (EM) energy reflected by one or more objects;
• determining, using the EM energy received by a two-dimensional (2D) array of the antenna, first angles associated with one or more detections of one or more objects, the 2D array comprising at least four antenna elements positioned in a first dimension and a second dimension, the first angles being in the first dimension;
• for each respective first angle of the first angles:
• steering the 2D array to the respective first angle to generate a steered 1D array by:
• projecting the 2D array onto a subspace formed by a first-dimension steering vector associated with the respective first angle,
• determining a projection matrix associated with the subspace formed by the first-dimension steering vector, and determining second-dimension information associated with the respective first angle based on the projection matrix associated with the subspace formed by the first-dimension steering vector, the second-dimension information being used to determine the second angles associated with the respective first angle;
• and
• determining, based on the steered 1D array, second angles associated with the one or more detections, the second angles being in the second dimension and associated with the respective first angle.