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Analysis on the Influence of Sound Velocity Fluctuation in the Oceans on Acoustic Propagation and Positioning Precision
Author(s): 
Pages: 15-20
Year: Issue:  3
Journal: Journal of Ocean Technology

Keyword:  acoustic velocity fluctuationeigenrayspassive localizationpropagation timeprecision analysis;
Abstract: The acoustic velocity fluctuation in the oceans leads to the changes of underwater acoustic channel,which change the arrival structure of soundlines and influence the acoustic propagation and the positioning accuracy. To discuss this effect, the underwater passive location model considering sound ray bending is built based on the TDOA system, the infuence of sound velocity fluctuation on underwater sound propagation path and propagation time is analyzed, and besides, the influence of acoustic velocity fluctuation on underwater passive localization accuracy is studied in detail in this paper. The results show that the infuence of sound velocity fluctuation on underwater sound propagation path and propagation time is more significant when the horizontal propagation distance is larger. Take the four element array for example, if the length of baseline is 20 km, and the depth of receiving arrays is 5 km, the influence of acoustic velocity fluctuation on positioning precision is less than 0.5 m without considering other random errors. The analysis results are helpful to optimize the passive location measurement scheme with environmental characteristics and provide basis for the design and precision evaluation of the underwater passive positioning system.
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