A Three-dimensional Seabed Tracking Method Based on Joint Judgment of Dual Domain Features

• Published in: 2018 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC) pp. 1 - 3
• Main Authors: Zhu, Bibo, Jiang, Hanlei, Cong, Weihua
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.09.2018
• Subjects: Aliased echo phenomenon; Navigation; Reflection; Reverberation; Synthetic aperture sonar; Target tracking; Three-dimensional image; Tracking the submarine interface; Underwater vehicles
• DOI: 10.1109/ICSPCC.2018.8567745

The three-dimensional imaging sonar uses wide-band low-frequency signals emitted at large grazing angles. It can obtain three-dimensional high resolution images of underwater formations through synthetic aperture sonar and azimuthal array processing techniques. Due to seafloor echo aliasing interference, the three-dimensional image of the seabed surface appears blurred. This phenomenon affects the effects of small target and shallow formation imaging at the bottom. This paper proposes a three-dimensional seabed tracking method based on joint judgment of dual domain features. Firstly, the method uses the data after the pulse compression process to obtain the initial reference range of the subsea interface. Secondly, by designing the amplitude threshold of the seabed interface image and further designing the continuity thresholds in the depth dimension and heading dimension, the method can eliminate some of the seafloor distortion position values. Thirdly, the method uses the hamming window function to perform weighted extrapolation, which can Iinearly predict the range of the seafloor position in the three-dimensional direction, and can improve the search computational efficiency. Finally, the two-dimensional surface array of the submarine interface can be optimized by the time integration of different dimensions. Through the derivation of the formula and the verification of the actual echo data, this method can effectively deal with the blurring of the submarine interface of the three-dimensional image, The algorithm has excellent robustness and low computational complexity. It has a certain degree of innovation and good engineering practical value.