High Resolution Beamforming on Vertical Arrays in a Realistic Oceanic Environment
Abstract
This technical memorandum discusses the performance of high resolution methods used to process the data from vertical line arrays in a realistic oceanic sound speed environment. Conventional and high resolution processors (Minimum Variance Distortionless Response (MDVR) beamformer and MUltiple Signal Classification (MUSIC) Direction Of Arrival (DOA) estimator) are described and their implementations are discussed as well. The general beamforming structure is decomposed in two steps. After the estimation of the covariance matrix, a measure of the match or mismatch between the measured field and a replica vector characterizing a particular direction is computed. Using a signal framework, the limitations of the high resolution methods under correlated arrivals then are discussed. Preprocessing methods which limit the almost complete degradation of their performance are considered. These spatial smoothing methods are given several interpretations and their performance characterized. The importance of wavefront curvature is assessed and the influence of curvature on the beamformers is described. The spatial smoothing methods are applied in a curved wavefront environment and the performance of the MVDR beamformer and MUSIC algorithm under correlated and curved wavefront arrivals is described. Keywords: Vertical line arrays; Signal processing.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 02, 1989
- Accession Number
- ADA220164
Entities
People
- Jean-marie Q. Tran
- William Hodgkiss
Organizations
- Scripps Institution of Oceanography