Abstract
The basic principle of the ultra-short baseline (USBL) positioning system is to calculate the slant distance and azimuth between the underwater measurement target and the ultra-short baseline array through the different time delay between the underwater response signal and each receiving point, and finally calculate the position information of the target. When the number of vertical layers in the sound velocity profile is large, the calculation amount of using the equal gradient method is large. Based on the principle of equal gradient sound line tracking, this paper proposes a gradient difference based sound line adaptive layering method, which can eliminate the redundant layering points and the points whose sound velocity changes exceed the set threshold, simplify the sound velocity profile and improve the efficiency of sound line tracking. In this paper, the layered results under different thresholds are given through simulation experiments. By adjusting the threshold value, the calculation amount of this method can be reduced by 40% to 70%, and the deviation of slant distance is less than 1% compared with the equal gradient ray tracing method.
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This work is supported by National Key R&D Program, China [2017YFC0306100] and National Natural Science Foundation of China under Grant No. 61671202
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Zhang, R., Li, J., Zhang, J., Wang, Z. (2021). A Fast Sound Ray Tracking Method for Ultra-short Baseline Positioning. In: Sun, X., Zhang, X., Xia, Z., Bertino, E. (eds) Artificial Intelligence and Security. ICAIS 2021. Lecture Notes in Computer Science(), vol 12736. Springer, Cham. https://doi.org/10.1007/978-3-030-78609-0_54
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