Calibration of a Long‐Base‐Line Underwater Acoustic Tracking Range

1967 ◽  
Vol 42 (5) ◽  
pp. 1187-1187
Author(s):  
Miles W. McLennan
Keyword(s):  
Base Line ◽  
Acoustic Tracking ◽  
Underwater Acoustic ◽  
Tracking Range

Assessing Seaglider® Model-based Position Accuracy on an Acoustic Tracking Range

2021 ◽  
Author(s):  
James S. Bennett ◽  
Frederick R. Stahr ◽  
Charles C. Eriksen ◽  
Martin C. Renken ◽  
Wendy E. Snyder ◽  
...  
Keyword(s):  
Autonomous Underwater Vehicles ◽  
Position Error ◽  
Momentum Balance ◽  
Model Parameters ◽  
Tidal Basin ◽  
Acoustic Tracking ◽  
Position Accuracy ◽  
Dependent Flow ◽  
Tracking Range ◽  
Flight Model

AbstractSeagliders® are buoyancy-driven autonomous underwater vehicles whose sub-surface position estimates are typically derived from velocities inferred using a flight model. We present a method for computing velocities and positions during the different phases typically encountered during a dive-climb profile based on a buoyancy-driven flight model. We compare these predictions to observations gathered from a Seaglider deployment on the acoustic tracking range in Dabob Bay (200 m depth, mean vehicle speeds ~30 cm s-1), permitting us to bound the position accuracy estimates and understand sources of various errors. We improve position accuracy estimates during long vehicle accelerations by numerically integrating the flight-model's fundamental momentum-balance equations. Overall, based on an automated estimation of flight-model parameters, we confirm previous work that predicted vehicle velocities in the dominant dive and climb phases are accurate to < 1 cm s-1, which bounds the accumulated position error in time. However, in this energetic tidal basin, position error also accumulates due to unresolved depth-dependent flow superimposed upon an inferred depth-averaged current.

A Design for Water Surface Communication System of Ultra Short Base Line Positioning System

2013 ◽  
Vol 756-759 ◽  
pp. 2184-2187
Author(s):  
Fu Peng Qiu ◽  
Hong Jie Wan ◽  
Xue Wei Wang
Keyword(s):  
Spread Spectrum ◽  
Communication System ◽  
Water Surface ◽  
Direct Sequence Spread Spectrum ◽  
Base Line ◽  
Positioning System ◽  
Main Function ◽  
Underwater Acoustic ◽  
Design Idea ◽  
Offshore Oil

In order to satisfy the requirement of the underwater acoustic positioning system for offshore oil exploration, a design idea for water surface communication system of ultra short base line (USBL) positioning system. The main function of this design is to achieve high-quality communication with underwater acoustic responders. The hardware adopted JZ4760 and the FPGA of altera as the cores. Gold sequence direct sequence spread-spectrum was used on communication system, while modulation was PSK. An appropriate spread-spectrum synchronization mode was presented for the system. MATLAB-based simulation and experiments show that the system is working reliably.

Underwater acoustic tracking in shallow water for naval training ranges

1996 ◽  
Vol 100 (4) ◽  
pp. 2703-2703
Author(s):  
Peter J. Stein ◽  
Steven E. Euerle ◽  
Richard K. Menoche ◽  
Robert E. Janiesch
Keyword(s):  
Shallow Water ◽  
Acoustic Tracking ◽  
Underwater Acoustic

scholarly journals An Ultra-Short Baseline Positioning Model Based on Rotating Array & Reusing Elements and Its Error Analysis

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4373 ◽  
Author(s):  
Jinwu Tong ◽  
Xiaosu Xu ◽  
Lanhua Hou ◽  
Yao Li ◽  
Jian Wang ◽  
...  
Keyword(s):  
Depth Information ◽  
Base Line ◽  
Positioning System ◽  
Positioning Error ◽  
Long Distance ◽  
Positioning Accuracy ◽  
Underwater Acoustic ◽  
Positioning Systems ◽  
Model Based ◽  
Underwater Positioning

The USBL (Ultra-Short Base Line) positioning system is widely used in underwater acoustic positioning systems due to its small size and ease of use. The traditional USBL positioning system is based on ‘slant range and azimuth’. The positioning error is an increasing function with the increase in distance and the positioning accuracy depends on the ranging accuracy of the underwater target. This method is not suitable for long-distance underwater positioning operations. This paper proposes a USBL positioning calculation model based on depth information for ‘rotating array and reusing elements’. This method does not need to measure the distance between the USBL acoustic array and target, so it can completely eliminate the influence of long-distance ranging errors in USBL positioning. The theoretical analysis and simulation experiments show that the new USBL positioning model based on ‘rotating array and reusing elements’ can completely eliminate the influence of the wavelength error and spacing error of underwater acoustic signals on the positioning accuracy of USBL. The positioning accuracy can be improved by approximately 90%, and the horizontal positioning error within a positioning distance of 1000 m is less than 1.2 m. The positioning method has high precision performance in the long distance, and provides a new idea for the engineering design of a USBL underwater positioning system.

Delay-Tolerant Data Fusion for Underwater Acoustic Tracking Networks

2021 ◽  
Author(s):  
Mohammadreza Alimadadi ◽  
Milica Stojanovic ◽  
Pau Closas
Keyword(s):  
Data Fusion ◽  
Acoustic Tracking ◽  
Underwater Acoustic ◽  
Delay Tolerant
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