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Patent Searching and Data


Title:
TAYLOR EXPANSION-BASED INITIAL GRAZING ANGLE SOLVING METHOD, AND SOUND RAY BENDING CORRECTION METHOD AND DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/252945
Kind Code:
A1
Abstract:
A taylor expansion-based initial grazing angle solving method, and a sound ray bending correction method and device. The method comprises: (1) estimating an initial grazing angle θ 0 based on a triangle principle according to a sound velocity profile c(z), a measurement delay t, and a transponder depth H, and taking the sine Θ 0 of an angle of refraction which is complementary to the initial grazing angle θ 0 as an iterative initial value; (2) according to the iterative initial value, solving a horizontal distance and an estimation delay d by using a constant-gradient sound ray tracing method, performing taylor expansion of a constant-gradient sound ray tracing formula at an initial value, calculating a sine increment according to a delay offset, and updating the initial value; (4) repeating steps 2 and 3, ending iteration until an iteration end condition is satisfied, and according to the sine value Θ 0 at this time, obtaining a final initial grazing angle θ 0 = arccos Θ 0. Hence, a search range is narrowed, the search resolution is improved, the search time and precision are obviously improved, and the method is simple and efficient and is suitable for underwater detection and positioning.

Inventors:
XU XIAOSU (CN)
JIN BOZUO (CN)
ZHANG TAO (CN)
LI YAO (CN)
YAO YIQING (CN)
Application Number:
PCT/CN2019/105178
Publication Date:
December 24, 2020
Filing Date:
September 10, 2019
Export Citation:
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Assignee:
UNIV SOUTHEAST (CN)
International Classes:
G01S15/66; G01S3/80; G01S7/52; G01S15/74
Foreign References:
CN107132520A2017-09-05
CN101777954A2010-07-14
CN107990969A2018-05-04
CN109724684A2019-05-07
US20060273946A12006-12-07
Attorney, Agent or Firm:
NANJING RUIHONG PATENT & TRADEMARK AGENCY (ORDINARY PARTNERSHIP) (CN)
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