Time-varying ocean channel modeling method

Abstract

The invention discloses a time-varying ocean channel modeling method. The method comprises: (1), calculation is carried out by using a sound ray propagation path obtained by a Bellhop model and ray acoustical simulation software to obtain an impact response of a channel and the obtained impact response is used as an initial value of the channel impact response in time-varying channel modeling; (2), a time-varying underwater acoustic channel updating based on a data block length is established, a statistical characteristic, changing with time, of an ocean channel impact response h(t) is obtained, statistical characteristics, changing with time, of an ht and an h t+tau after sampling according to a symbol rate are studied, and a data base of statistical parameters is established; and (3), underwater acoustic channel changing situations can be classified into a situation of unchanging of the structure of the h t+tau relative to the structure of the ht and a situation of changing of the structure of the h t+tau relative to the structure of the ht; and when the structure of the ht does not change, the h t+tau updates the channel by the correlation degree of the channel changing with time in the database; and when the structure of the ht changes, a new sparseness factor is generated again and the channel is updated. According to the invention, with the established time-varying underwater acoustic channel statistic model, the ocean underwater acoustic channel can be recovered well and thus the sparse characteristic of the underwater acoustic channel can be reflected accurately.

Description

technical field [0001] The invention relates to the field of underwater communication, in particular to a modeling method of an ocean channel. Background technique [0002] Different from radio communication, underwater communication has extremely complex channels, and the modeling of underwater acoustic channels is very difficult. It is very difficult to accurately establish a model suitable for all underwater acoustic channels. A lot of research. [0003] Ocean channel modeling methods mainly include statistical model, deterministic model and semi-deterministic semi-statistical model. The ocean channel statistical measurement method was originally proposed. According to the relevant parameters of the ocean's physical characteristics such as different seasons, temperature, wind speed, and salinity, the characteristics of the ocean channel under various dynamic conditions are recorded, and then a large amount of data is counted to fit the statistics. To characterize the ch...

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Problems solved by technology

However, its flaws cannot be avoided: as a deterministic model, the Bellhop model cannot reflect the time-varying characteristics of the system, and cannot effectively deal with issues such as the speed of sound of the horizontal transformation

The channel vector is simplified when modeling the double-extended dynamics, and th

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