Results 121 to 130 of about 123,247 (141)
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Source-oriented adaptive beamforming
Circuits, Systems, and Signal Processing, 1983A system concept expected to improve sonar multiple target detection and classification performance in severe directional interference environments is presented. Adaptive nulling of undesired strong interference sources and detection of desired weak sources are achieved by utilizing constrained adaptive processing techniquestogether with conventional ...
Salvatore D. Morgera, Andrew C. Callahan
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An escalator structure for adaptive beamforming
ICASSP '83. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2005The standard LMS algorithms for adaptive beamforming though straightforward, suffer from the main draw back of having slow, convergence rate. This is normally attributed to the wide range of spread of eigenvalues of the input signal vector correlation matrix.
B. Madan, G. Kuriyan
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Adaptive beamforming with a Microphone Array
2015 18th International Conference on Computer and Information Technology (ICCIT), 2015A robust and optimized system architecture has been developed and designed for adaptive beamformer with a Microphone Array. The system includes following subsystems — MMSE STSA Estimator, DOI (Direction of Interest) Estimator and an Adaptive Beamformer.
Md. Abul Hayat +4 more
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2012
DBF architectures provide significant functionality enhancements for phased array radar. At the current state of digital technology, element-level DBF is often impractical for large arrays operating at high frequencies, so subarray level implementations are commonly used to reduce the digital receiver count.
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DBF architectures provide significant functionality enhancements for phased array radar. At the current state of digital technology, element-level DBF is often impractical for large arrays operating at high frequencies, so subarray level implementations are commonly used to reduce the digital receiver count.
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Recent Developments in Adaptive Beamforming [PDF]
2019 IEEE International Ultrasonics Symposium (IUS), 2019 Beamforming is an indispensable process to obtain an ultrasound image. In most of clinical ultrasound systems, the delay-and-sum (DAS) beamformer is implemented. The DAS beamformer applies time delays to ultrasonic echo signals received by individual transducer elements in an ultrasonic probe so that the phases of echoes from a point at the focus are ...
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Adaptive beamforming as an inverse problem
International Conference on Acoustics, Speech, and Signal Processing, 2003In previous work, the authors developed a minimum-mean-square-error beamformer (MMSE-BF). When they compared it to the minimum-variance distortionless-response beamformer (MVDR-BF), they concluded that it is especially suited for correlated returns. This improvement is at the cost of some frequency distortion in wideband applications.
Victor Barroso, Jose M. F. Moura
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Adaptive Beamformers and Time Corrections
68th EAGE Conference and Exhibition incorporating SPE EUROPEC 2006, 2006Receiver arrays are used in seismic acquisition for data reduction. The array response can be computed based on single-sensor recordings, preferable after a data pre-processing performed in order to eliminate the static and amplitude effects. An adaptive beamforming algorithm is presented in this paper with application on synthetic and field seismic ...
Ionelia Panea, Guy Drijkoningen
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Adaptive beamforming for cyclostationary signals
2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03)., 2004In this paper, we propose a direction finding beamformer algorithm that exploits cyclostationarity (or periodic correlation). This new adaptive algorithm shows very attractive estimation performance over conventional beamforming methods, as depicted by simulation results.
Pascal Chargé +2 more
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Fast rank-adaptive beamforming
Proceedings of the 2000 IEEE Sensor Array and Multichannel Signal Processing Workshop. SAM 2000 (Cat. No.00EX410), 2002This paper is concerned with the construction of an adaptive beamformer, which uses the dominant subspace information of a sample covariance matrix. We assume that the sample covariance matrix and its eigenvalue decomposition (EVD) are to be updated as data arrive.
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Beamspace adaptive beamforming for ultrasound imaging
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2009Applying the Capon adaptive beamformer in medical ultrasound imaging results in enhanced resolution by improving the interference-suppressing capabilities of the array. This improvement comes at the expense of an increased computational complexity. We have investigated the application of a beamspace adaptive beamformer for medical ultrasound imaging ...
Ines Hafizovic, Carl-Inge Colombo Nilsen
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