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Autonomous Underwater Vehicle motion response: a nonacoustic tool for blue water navigation

Citation

Randeni, ATRP and Forrest, AL and Cossu, R and Leong, ZQ and King, PD and Ranmuthugala, D, Autonomous Underwater Vehicle motion response: a nonacoustic tool for blue water navigation, Marine Technology Society Journal, 50, (2) pp. 17-26. ISSN 0025-3324 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 Marine Technology Society

DOI: doi:10.4031/MTSJ.50.2.3

Abstract

Autonomous underwater vehicles (AUVs) use secondary velocity over ground measurements to aid the Inertial Navigation System (INS) to avoid unbounded drift in the point-to-point navigation solution. When operating in deep open ocean (i.e., in blue water - beyond the frequency-specific instrument range), the velocity measurements are either based on water column velocities or completely unavailable. In such scenarios, the velocity-relative-to-water measurements from an acoustic Doppler current profiler (ADCP) are often used for INS aiding. ADCPs have a blanking distance (typically ranging between 0.5 and 5 m) in proximity to the device in which the flow velocity data are undetectable. Hence, water velocities used to aid the INS solution can be significantly different from that near the vehicle and are subjected to significant noise. Previously, the authors introduced a nonacoustic method to calculate the water velocity components of a turbulent water column within the ADCP dead zone using the AUV motion response (referred to as the WVAM method). The current study analyzes the feasibility of incorporating the WVAM method within the INS by investigating the accuracy of it at different turbulence levels of the water column. Findings of this work demonstrate that the threshold limits of the method can be improved in the nonlinear ranges (i.e., at low and high levels of energy); however, by estimating a more accurate representation of vehicle hydrodynamic coefficients, this method has proven robust in a range of tidally induced flow conditions. The WVAM method, in its current state, offers significant potential to make a key contribution to blue water navigation when integrated within the vehicle's INS.

Item Details

Item Type:Refereed Article
Keywords:water column velocity, INS, autonomous underwater vehicles (AUVs), acoustic Doppler current profilers (ADCPs), WVAM
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Naval Architecture
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in Engineering
Author:Randeni, ATRP (Mr Supun Randeni Pathiranachchilage)
Author:Forrest, AL (Dr Alexander Forrest)
Author:Cossu, R (Dr Remo Cossu)
Author:Leong, ZQ (Dr Zhi Leong)
Author:King, PD (Mr Peter King)
Author:Ranmuthugala, D (Professor Dev Ranmuthugala)
ID Code:109504
Year Published:2016
Deposited By:Seafaring
Deposited On:2016-06-20
Last Modified:2017-10-19
Downloads:0

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