Evaluation of the Dominant Mode Rejection Beamformer.
Abstract
Increasing the number of hydrophones in an array should increase beamformer performance. However, when the number of hydrophones is large, integration times must be long enough to give accurate cross spectral matrix (CSM) estimates, but short enough so that the dynamic behavior of the noise described by the CSM is captured. The dominant mode rejection (DMR) beamformer calculates adaptive weights based on a reduced rank CSM estimate, where the CSM estimate is formed with a subset of the largest eigenvalues and their eigenvectors. Since the largest eigenvalue/eigenvector pairs are estimated rapidly, the integration time required is reduced. The purpose of this study was to examine the DMR beamformer performance using several bottom mounted horizontal line arrays, in both deep and shallow water environments. The data were processed with two fully adaptive beamformers and the DMR beamformer. The DMR beamformer showed less output power bias at shorter integration times and also showed better performance than the fully adaptive beamformers when using arrays with larger numbers of hydrophones. Thus, in highly dynamic noise environments, the DMR beamformer may be a more appropriate implementation to use for passive sonar detection systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 11, 1996
- Accession Number
- ADA309720
Entities
People
- Tina R. Messerschmitt
Organizations
- University of Texas at Austin