US 12,493,112 B2
Multiple-target, simultaneous beamforming for four-dimensional radar systems
Yujie Gu, Calabasas, CA (US); Xin Zhang, Agoura Hills, CA (US); Zhengzheng Li, Agoura Hills, CA (US); and Yu Zhang, Thousand Oaks, CA (US)
Assigned to Aptiv Technologies AG, Schaffhausen (CH)
Filed by Aptiv Technologies AG, Schaffhausen (CH)
Filed on Sep. 19, 2022, as Appl. No. 17/933,265.
Prior Publication US 2024/0103151 A1, Mar. 28, 2024
Int. Cl. G01S 13/42 (2006.01); G01S 7/02 (2006.01); G01S 13/02 (2006.01); G01S 13/931 (2020.01); H01Q 1/32 (2006.01)
CPC G01S 13/42 (2013.01) [G01S 7/023 (2013.01); G01S 13/931 (2013.01); H01Q 1/3233 (2013.01); G01S 2013/0245 (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 an additional one-dimensional (1D) concatenated array, including additional antenna elements not encompassed by the 2D array, and positioned in the first dimension; and
one or more processors configured to:
determine, using the EM energy received at the additional 1D concatenated array, first angles associated with the one or more objects, the first angles being in the first dimension;
determine, using the first angles, an interference-orthogonal subspace projection matrix, the interference-orthogonal subspace projection matrix being determined without an estimate of a power of noise in the EM energy or a power of interference signals in the EM energy;
estimate, using the interference-orthogonal subspace projection matrix, an interference-orthogonal subspace projection-based beamformer, the interference-orthogonal subspace projection-based beamformer being a function of the interference-orthogonal subspace projection matrix and a steering vector for the EM energy, the steering vector being a function of the first angles;
estimate, using a Hermitian of the interference orthogonal subspace projection-based beamformer, a desired signal output of the EM energy without the interference signals; and
determine, using vector information of the desired signal output in the first dimension, second angles associated with the one or more objects, each second angle of the second angles being in the second dimension and corresponding to a respective first angle of the first angles.