US 12,381,601 B2
Beam control method and system of array antenna based on frequency diversity, and beam controller
Shengheng Liu, Jiangsu (CN); Yongming Huang, Jiangsu (CN); Zihuan Mao, Jiangsu (CN); Tianheng Ni, Jiangsu (CN); and Xiaohu You, Jiangsu (CN)
Assigned to PURPLE MOUNTAIN LABORATORIES, Jiangsu (CN)
Appl. No. 18/276,186
Filed by PURPLE MOUNTAIN LABORATORIES, Jiangsu (CN)
PCT Filed Oct. 15, 2021, PCT No. PCT/CN2021/124026
§ 371(c)(1), (2) Date Aug. 7, 2023,
PCT Pub. No. WO2022/170783, PCT Pub. Date Aug. 18, 2022.
Claims priority of application No. 202110173525.5 (CN), filed on Feb. 9, 2021.
Prior Publication US 2024/0113748 A1, Apr. 4, 2024
Int. Cl. H04B 7/0408 (2017.01); H04B 7/06 (2006.01)
CPC H04B 7/0408 (2013.01) [H04B 7/0617 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A beam control method of an array antenna based on a frequency diversity, comprising:
receiving signals from a transmitter by a receiving array which comprises a first sub-array and a second sub-array, wherein the first sub-array comprises M uniformly arranged array elements, the second sub-array comprises N uniformly arranged array elements, M and N are coprime integers, M≥0 and N≥0;
inputting, into a constructed model, a signal received by each array element in the receiving array, and outputting a covariance matrix after processing the input signal via the model, wherein the model is related to a received signal vector, a steering vector and a target scattering power;
constructing a virtual array at a receiver, wherein a virtual array element in the virtual array is a second-order statistic calculated according to the covariance matrix; and
randomly selecting a frequency for each virtual array element from a frequency set of the virtual array, so as to form a beam pattern, wherein the frequency in the frequency set is a sum of a reference frequency and A times of unit frequency offset, A is selected from a difference set of a first array and a second array, the first array comprises E elements, the second array comprises F elements, E and F are coprime integers, and E≥0, and F≥0;
wherein when Q irrelevent far-field point targets are comprised and a qth far-field point target is located in the two-dimensional polar coordinate system, and a far-field point target is located in the two-dimensional polar coordinate system and the virtual array is formed at another position by means of beam forming, the signal expression of the Ith virtual array element among the virtual array elements in the virtual array is:

OG Complex Work Unit Math
wherein, ml represents a random variable, u=sin(θ−θq) and v=Δf(R−Rq)/c, u and v are respectively substitution symbols for normalizing θ and R, q is an integer and 1≤q≤Q, Δf represents a unit frequency offset, c represents a light speed, (θ, R) represents coordinates of the Ith virtual array element at the other position, L represents the number of the virtual array elements in the virtual array, and the Ith virtual array element refers to any virtual array element among the virtual array elements, and custom character represents a square root of −1.