Signal processing for AUV based interferometric synthetic aperture sonar

Hansen, Roy Edgar; Sæbø, Torstein Olsmo; Gade, Kenneth; Chapman, S.

doi:10.1109/oceans.2003.178294

Cited by 51 publications

(18 citation statements)

References 11 publications

(19 reference statements)

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“…Within the synthetic array, the sonar has to be positioned with a fraction of a wavelength accuracy. In order to achieve such an accuracy, a combination of inertial navigation together with the displaced phase-center antenna (DPCA) technique [9] is most often used. To use DPCA, there must be an overlap of the elements between neighboring pings in the virtual array.…”

Section: Methodsmentioning

confidence: 99%

Use of the minimum variance beamformer in synthetic aperture sonar imaging

Austeng¹,

Jensen²,

Nilsen³

et al. 2013

Proceedings of Meetings on Acoustics

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Section: Methodsmentioning

confidence: 99%

Use of the minimum variance beamformer in synthetic aperture sonar imaging

Austeng¹,

Jensen²,

Nilsen³

et al. 2013

Proceedings of Meetings on Acoustics

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“…Signals reflected back from the seafloor and from objects in the water volume are received in two long multi-element receiver arrays, as well as in the transmitter. A complex signal processing chain, working on data from a number of consecutive pings, transforms the raw data into sonar imagery and bathymetry (Hagen et al, 2001) (Hansen et al, 2003).…”

Section: Sensor Autonomymentioning

confidence: 99%

Making AUVs Truly Autonomous

Espen¹,

Hegrens²,

Jalving³

et al. 2009

Underwater Vehicles

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IntroductionAfter decades of research and development, autonomous underwater vehicles (AUVs) are today becoming accepted by an increasing number of users in various military and civilian establishments. The number of AUV systems sold to civilian and military customers worldwide is well into triple digits. The bulk of these systems have been manufactured within the last five years, so the sector is in rapid growth. AUVs provide a safe, cost-effective and reliable alternative to manned or remotely controlled systems. For military users, they can reduce the exposure of personnel and highvalue assets to dangerous environments such as mine fields or enemy-controlled harbours and waterways. They also facilitate covert or clandestine information gathering behind enemy lines. For civilian users, the flexibility and agility of AUVs make them cost-effective sensor platforms, in particular in deeper water. However, the actual autonomy of the vehicles in existence today is limited in many ways, restricting their potential uses. Further advances in AUV autonomy will enable new operations, such as covert, very long endurance missions (weeks) in unknown and/or hostile areas. While some experimentation is already taking place with e.g. under ice operations, the chance of failure is unacceptably high for many potential users. De-risking of long-endurance autonomous operations in unknown areas is thus an important goal for the AUV community. The level of autonomy achieved by AUVs is chiefly determined by their performance in three areas:Energy autonomy -reliable power sources and low power consumption for longendurance missions.Navigation autonomy -precise navigation and positioning with little or no position estimate error growth for extended periods of time.Decision autonomy -the ability to sense, interpret and act upon unforeseen changes in the environment and the AUV itself. These three areas should be addressed in a balanced fashion. In particular, navigation and decision autonomy are interlinked in various ways -the AUV's trajectory will affect navigation system and individual sensor performance, while the navigation system's performance will affect the AUV's ability to achieve the mission objectives. Actions taken by a decision autonomy subsystem can include changes to the vehicle trajectory, but also sensor configuration and utilization.Open Access Database www.intechweb.org

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“…For this to work properly, the array position displacement between pings must be found with extremely high accuracy. This is called micronavigation or DPCA (displaced phase centre antenna) (Belletini & Pinto, 2002;Hansen et. al., 2003).…”

Section: Micro Delta-position Aidingmentioning

confidence: 99%