Intelligent metasurface-assisted low-overhead positioning method under mixed field beam offset effect

The invention discloses an intelligent metasurface-assisted low-overhead positioning method under a mixed field beam offset effect, and belongs to the field of sensing in wireless communication. According to the method, the polar coordinate domain dictionary is used, distance factors are added into dictionary elements, the problem that a traditional discrete Fourier transform dictionary is mismatched with near-field spherical waves is solved, and the adverse effect of spectrum leakage on positioning performance is reduced; by using the frequency-dependent dictionary, different subcarriers are considered in the dictionary, the beam offset effect is optimized, and the positioning precision is improved; through the assistance of the intelligent metasurface, the problem of inaccurate user positioning caused by public timing deviation is solved by using the arrival time difference, and meanwhile, the user is locked on a hyperbola, so that the calculation complexity caused by global search is reduced; the angle of