US 12,216,227 B2
Radar system with sequential two-dimensional angle estimation
Xin Zhang, Agoura Hills, CA (US); Yujie Gu, Calabasas, CA (US); and Zhengzheng Li, Agoura Hills, CA (US)
Assigned to Aptiv Technologies AG, Schaffhausen (CH)
Filed by Aptiv Technologies AG, Schaffhausen (CH)
Filed on Feb. 25, 2022, as Appl. No. 17/652,625.
Claims priority of provisional application 63/266,936, filed on Jan. 19, 2022.
Prior Publication US 2023/0228845 A1, Jul. 20, 2023
Int. Cl. G01S 7/40 (2006.01); G01S 13/42 (2006.01); G01S 13/87 (2006.01); G01S 13/93 (2020.01); G01S 13/931 (2020.01); H01Q 21/08 (2006.01)
CPC G01S 7/4021 (2013.01) [G01S 13/42 (2013.01); G01S 13/878 (2013.01); G01S 13/931 (2013.01); H01Q 21/08 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A radar system comprising:
an antenna configured to receive electromagnetic (EM) energy reflected by one or more objects, the antenna comprising a two-dimensional (2D) array that includes at least four antenna elements positioned in a first dimension and a second dimension; and
one or more processors configured to:
determine, using the EM energy received at the antenna, first angles associated with one or more detections of the one or more objects, 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.