3 results about "Ship noise" patented technology

The application provides a marine environment noise prediction method for ship abnormal behavior monitoring, and comprises the following steps: establishing a marine environment noise prediction model; determining the type of the marine environment noise numerical prediction model; and performing marine environment noise prediction according to the determined type of the prediction model. The application constructs a fast and refined marine environment noise prediction model, the fast model considers three noise sources of wind, rain and ships, and realizes the purpose of real-time fast prediction of marine environment noise according to the source level empirical formula of different noise sources summarized according to the measured data; the refined model considers two noise sources of wind and ships, and realizes the purpose of refined prediction of marine environment noise by using the source level empirical formula of different noise sources, combining real-time gridded wind speed and ship AIS data to complete the construction of wind and ship noise source models, and comprehensively considering the factors of gridded hydrological information and ocean depth database and calculation frequency.

The application provides a ship noise sequence generation method based on frequency domain mask guided diffusion, multi-granularity frequency information is constructed by introducing a frequency domain random mask to guide the diffusion process, thereby improving the quality and diversity of the generated samples. Traditional diffusion methods usually rely on complete initial information for generation, and less explore the use of incomplete intermediate information as guidance. Existing methods mostly use time domain fixed filters to construct multi-granularity data as intermediate information, but ignore the randomness of the data, limiting the flexibility and diversity of the generation process. Therefore, the application proposes to apply a random mask in the frequency domain to construct multi-granularity guide information as intermediate information to guide diffusion, and combine the correlation coefficient matrix embedding as a condition to supplement, to supplement the channel correlation information lost due to the mask operation.