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Signals-of-Opportun...
Signals-of-Opportunity-Based Hydrophone Array Shape and Orientation Estimation
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- Skog, Isaac (författare)
- Uppsala Univ, Sweden; Swedish Def Res Agcy FOI, Sweden
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- Nordenvaad, Magnus Lundberg (författare)
- Swedish Def Res Agcy FOI, Sweden
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- Hendeby, Gustaf (författare)
- Linköpings universitet,Reglerteknik,Tekniska fakulteten
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(creator_code:org_t)
- 2024
- 2024
- Engelska.
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Ingår i: IEEE Journal of Oceanic Engineering. - : IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC. - 0364-9059 .- 1558-1691.
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https://liu.diva-por... (primary) (Raw object)
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- A signal-of-opportunity-based method to automatically calibrate the orientations and shapes of a set of hydrophone arrays using the sound emitted from nearby ships is presented. The calibration problem is formulated as a simultaneous localization and mapping problem, where the locations, orientations, and shapes of the arrays are viewed as the unknown map states, and the position, velocity, etc., of the source as the unknown dynamic states. A sequential likelihood ratio test, together with a maximum a posteriori source location estimator, is used to automatically detect suitable sources and initialize the calibration procedure. The performance of the proposed method is evaluated using data from two 56-element hydrophone arrays. Results from two sea trials indicate that: 1) signal sources suitable for the calibration can be automatically detected; 2) the shapes and orientations of the arrays can be consistently estimated from the different data sets with shape variations of a few decimeters and orientation variations of less than 2(degrees) and 3) the uncertainty bounds calculated by the calibration method are in agreement with the true calibration uncertainties. Furthermore, the bearing time record from a sea trial with an autonomous mobile underwater signal source also shows the efficacy of the proposed calibration method. In the studied scenario, the root-mean-square bearing tracking error was reduced from 4(degrees) to 1(degrees) when using the calibrated array shapes compared to assuming the arrays' to be straight lines. Also, the beamforming gain increased by approximately 1 dB.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
Nyckelord
- Beamforming; calibration; hydrophone array; simultaneous localization and mapping (SLAM); tracking
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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