Environmentally tolerant beamforming for high-resolution matched field processing: Deterministic mismatch

Schmidt, Henrik; Baggeroer, Arthur B.; Kuperman, W. A.; Scheer, Edward

doi:10.1121/1.400208

Cited by 137 publications

(47 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Following the method of Lagrangian multipliers, we take the gradient with respect to the variable wt and set it equal to zero, and then obtain 2w -aS = 0, (2 Note the weight vector is data independent, which is a special case of the adaptive Multiple Constraints Matching (MCM) beamformer [44].…”

Section: Single and Multiple Constraints Beamformingmentioning

confidence: 99%

Low-frequency bottom backscattering data analysis using multiple constraints beamforming

Li¹

1995

View full text Add to dashboard Cite

Section: Single and Multiple Constraints Beamformingmentioning

confidence: 99%

Low-frequency bottom backscattering data analysis using multiple constraints beamforming

Li¹

1995

View full text Add to dashboard Cite

“…One method to partially mitigate this shortcoming is to use the multiple constraint method (MCM) proposed by Schmidt et al [89]. The MCM imposes additional constraints to ensure that directions near the distortionless direction are not attenuated too heavily.…”

Section: Mvdr and MCM Beamformingmentioning

confidence: 99%

Analysis of and techniques for adaptive equalization for underwater acoustic communication

Blair¹

2011

View full text Add to dashboard Cite

Underwater wireless communication is quickly becoming a necessity for applications in ocean science, defense, and homeland security. Acoustics remains the only practical means of accomplishing long-range communication in the ocean. The acoustic communication channel is fraught with difficulties including limited available bandwidth, long delay-spread, time-variability, and Doppler spreading. These difficulties reduce the reliability of the communication system and make high data-rate communication challenging. Adaptive decision feedback equalization is a common method to compensate for distortions introduced by the underwater acoustic channel. Limited work has been done thus far to introduce the physics of the underwater channel into improving and better understanding the operation of a decision feedback equalizer. This thesis examines how to use physical models to improve the reliability and reduce the computational complexity of the decision feedback equalizer. The specific topics covered by this work are: how to handle channel estimation errors for the time varying channel, how to use angular constraints imposed by the environment into an array receiver, what happens when there is a mismatch between the true channel order and the estimated channel order, and why there is a performance difference between the direct adaptation and channel estimation based methods for computing the equalizer coefficients. For each of these topics, algorithms are provided that help create a more robust equalizer with lower computational complexity for the underwater channel.

show abstract

“…As with the case of plane wave beamforming, there are an assortment of processors that can be used for MFP/MFT [5] There have been two approaches to deal with environmental mismatch in MFP. The first has been to constructing processors which are tolerant to environmental uncertainty [6,7,8]. These processors trade resolution for lack of precise knowledge of the environment.…”

Section: Matched Field Processingmentioning

confidence: 99%

Workshop on Imaging of Complex Media with Acoustic and Elastic Waves

Kuperman¹

1999

View full text Add to dashboard Cite

Public rsporing burden for this collection of Information Is estimated to average 1 hour per response, Including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data need ed, and completing and reviewing the collection of information. Research SummaryThe workshop combined a tutorial approach in providing a common interdisciplinary basis with presentations and discussions of the latest research results. Contributions (13) of each of the discussions were compiled in a workshop proceedings entitled, "Imaging of Complex Media with Acoustic and Seismic Waves"

show abstract

Environmentally tolerant beamforming for high-resolution matched field processing: Deterministic mismatch

Cited by 137 publications

References 0 publications

Low-frequency bottom backscattering data analysis using multiple constraints beamforming

Low-frequency bottom backscattering data analysis using multiple constraints beamforming

Analysis of and techniques for adaptive equalization for underwater acoustic communication

Workshop on Imaging of Complex Media with Acoustic and Elastic Waves

Contact Info

Product

Resources

About