Results 241 to 250 of about 2,503,305 (272)
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Acoustic vector-sensor processing in the presence of a reflecting boundary
IEEE Transactions on Signal Processing, 2000We consider the passive direction-of-arrival (DOA) estimation problem using arrays of acoustic vector sensors located in a fluid at or near a reflecting boundary. We formulate a general measurement model applicable to any planar surface, derive an expression for the Cramer-Rao bound (CRB) on the azimuth and elevation of a single source, and obtain a ...
Malcolm Hawkes, Arye Nehorai
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Acoustic vector-sensor beamforming and Capon direction estimation
IEEE Transactions on Signal Processing, 1998We examine the improvement attained by using acoustic vector-sensors for direction-of-arrival (DOA) estimation, instead of traditional pressure sensors, via optimal performance bounds and particular estimators. By examining the Cramer-Rao bound in the case of a single source, we show that a vector-sensor array's smaller estimation error is a result of ...
Malcolm Hawkes, Arye Nehorai
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Separation of speech sources using an Acoustic Vector Sensor
2011 IEEE 13th International Workshop on Multimedia Signal Processing, 2011This paper investigates how the directional characteristics of an Acoustic Vector Sensor (AVS) can be used to separate speech sources. The technique described in this work takes advantage of the frequency domain direction of arrival estimates to identify the location, relative to the AVS array, of each individual speaker in a group of speakers and ...
Muawiyath Shujau +2 more
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A low-frequency superdirective acoustic vector sensor array
2015 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2015This paper provides a novel acoustic vector sensor array architecture for superdirectivity at low frequencies. It has a uniform 3 by 3 rectangular geometry of intersensor spacing less than 0.04 wavelength over its operation frequency band, with an up to 10.4 dB of directivity index in cylindrically isotropic noise.
Xijing Guo, Shie Yang, Hu Zhang
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Tracking sperm whales with a towed acoustic vector sensor
The Journal of the Acoustical Society of America, 2010Passive acoustic towed linear arrays are increasingly used to detect marine mammal sounds during mobile anthropogenic activities. However, these arrays cannot resolve between signals arriving from the port or starboard without vessel course changes or multiple cable deployments, and their performance is degraded by vessel self-noise and non-acoustic ...
Aaron, Thode +5 more
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Acoustic vector-sensor beamforming in the presence of flow noise
2011 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2011Passive sonar arrays are often used to find submerged vessels by measuring their radiated signal. Acoustic vector-sensor (AVS) arrays, which are normally towed by the ship at the ends of long cables, have been proven to be very effective for target direction of arrival (DOA) estimation.
Nan Zou, Ing Nam Goh, Arye Nehorai
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Surface-mounted acoustic vector-sensor array processing
1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings, 2002We consider the passive direction-of-arrival (DOA) estimation problem using arrays of acoustic vector-sensors located in a fluid, at or near a plane boundary. We formulate a general measurement model applicable to most surfaces, and derive an expression for the Cramer-Rao bound (CRB) of a single source.
Malcolm Hawkes, Arye Nehorai
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Circular Acoustic Vector-Sensor Array for Mode Beamforming
IEEE Transactions on Signal Processing, 2009Undersea warfare relies heavily on acoustic means to detect a submerged vessel. The frequency of the acoustic signal radiated by the vessel is typically very low, thus requires a large array aperture to achieve acceptable angular resolution. In this paper, we present a novel approach for low-frequency direction-of-arrival (DOA) estimation using ...
Nan Zou, Arye Nehorai
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Effects of sensor placement on acoustic vector-sensor array performance
IEEE Journal of Oceanic Engineering, 1999We consider the role played by the sensor locations in the optimal performance of an array of acoustic vector sensors, First we derive an expression for the Cramer-Rao bound on the azimuth and elevation of a single far-field source for an arbitrary acoustic vector-sensor array in a homogeneous wholespace and show that it has a block diagonal structure,
M. Hawkes, A. Nehorai
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Acoustic vector-sensor correlations in ambient noise
IEEE Journal of Oceanic Engineering, 2001Most array-processing methods require knowledge of the correlation structure of the noise. While such information may sometimes be obtained from measurements made when no sources are present, this may not always be possible. Furthermore, measurements made in-situ can hardly be used to analyze system performance before deployment.
M. Hawkes, A. Nehorai
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