Method for analyzing underwater light transmission characteristic

Abstract

The invention discloses a method for analyzing an underwater light transmission characteristic. The method is characterized by comprising the following steps of: 1, layering a water body in a depth direction, acquiring absorption coefficient values and scattering coefficient values which correspond to different layers, and calculating diffusion attenuation coefficients of the corresponding layers according to the absorption coefficient value and scattering coefficient value of each layer; 2, calculating the transmissivity of each layer according to the diffusion attenuation coefficient of each layer, multiplying the transmissivity of each layer to obtain the whole transmissivity of a water body communication channel, and correcting the whole transmissivity by adopting a truncation error to obtain the corrected whole transmissivity; and 3, outputting the transmission characteristic of the water body communication channel according to an attenuation situation of the water body. According to the method for analyzing the underwater light transmission characteristic, the communication channel transmission characteristic of light in the water is analyzed by using a vertical distribution model of chlorophyll concentration; and compared with the conventional attenuation coefficient model, the attenuation coefficient model has the advantages that the attenuation coefficients at different depths are not required to be measured through experiments, and the method is simple and is easy to apply.

Description

technical field [0001] The invention belongs to the field of laser communication, in particular to an analysis method for underwater light transmission characteristics. Background technique [0002] Seventy percent of the earth's area is covered by sea water, and there are a large number of civilian ships, ships and submarines engaged in naval warfare active in the sea. With the development of modern high-tech, the needs of underwater fishing, detection, control, etc., gradually formed a special application field of underwater communication. Traditional communication methods, such as radio wave communication and underwater acoustic communication, have been unable to meet the needs of underwater communication, and have become a technical bottleneck restricting the development of underwater communication. Compared with traditional communication technology, optical communication technology can overcome the shortcomings of traditional communication such as narrow bandwidth, str...

AI Technical Summary

Problems solved by technology

The attenuation model based on bio-optics is mainly to study the attenuation characteristics of light underwater by analyzing the influence of yellow substances, chlorophyll, suspended particles and other substances in seawater on light absorption and scattering, which can only be used for light transmission in the horizontal direction , and this method is no longer applicable when the light is transmitted vertically; the attenuation coefficient model mainly uses the attenuation coefficient of seawater to study the attenuation characteristics of light under water, although it is based on the actual measured data for analysis, it is more convincing However, when the light is transmitted vertically, the attenuation coefficient at different depths must be measured experimentally. If the error is smaller, the measured values ​​will be more, the analysis method will be more complicated, and the application is inconvenient.

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