Underwater sound MIMO high-speed communication frequency difference beam forming receiving method based on pilot frequency

The invention discloses an underwater acoustic MIMO high-speed communication frequency difference beam forming receiving method based on pilot frequency, relates to the technical field of underwater acoustic communication, and aims to solve the problem that a communication receiver cannot obtain an accurate multipath signal DOA through a conventional array signal processing algorithm due to the angle aliasing problem of a large array element array in array signal processing in the prior art. According to the invention, the uniform linear array of which the array elements are equally spaced and the space between the array elements is greater than the half-wavelength of the communication signal is used as the receiving array, a beam forming receiver scheme suitable for a high-speed underwater acoustic communication system is provided, the problem of angle aliasing of a large array element array in array signal processing is solved, and an accurate multipath signal DOA can be obtained. And the frequency domain s