Abstract
The construction of marine space-time frame networks is an important part of ocean exploitation and utilization. Accurate measurement of the coordinates of seafloor datum points is the basis of the network. The temporal and spatial variation of sound speed in seawater will cause refraction of sound waves. Effectively eliminating the refraction effect of sound waves is crucial to improving the accuracy of underwater acoustic positioning. However, sound ray correction requires a trade-off between ranging accuracy and computational efficiency. In this paper, we proposed a method to improve the positioning accuracy of the equivalent sound speed profile method, and the simulation experiment results show that the algorithm can accurately calculate the coordinates of the seafloor datum point with high computational efficiency.
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