Enhanced Minimum Variance Beamforming

Abstract

It is shown that both the multiple emitter signal location wavenumber spectrum estimator (MUSIC) and the minimum variance distortionless response (MVDR) beamformer are just special cases of the enhanced minimum variance (EMV) beamformer. Moreover, by separating planewave arrivals into two types, i.e., high level interferences and low (threshold) level signals, it is illustrated how the EMV beamformer simultaneously gives MUSIC-like angular resolution of an interference and MVDR-like detection of threshold signals. An additional advantage of the EMV beamformer is that the number of threshold signals need not be known a priori. As a preprocessor for the EMV beamformer, a dimensionality reducing transformation of the array data vector to a subarray beam space is proposed. This transformation is wavefront invariant and expedites the separation of source and coherent noise subspace eigenvalues. Keywords: Beamforming; Cross spectral density matrix; Eigenstructure; Interfering source; Minimum variance; Threshold signal.

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Document Details

Document Type
Technical Report
Publication Date
Nov 18, 1988
Accession Number
ADA203308

Entities

People

  • Norman L. Owsley

Organizations

  • Naval Underwater Systems Center

Tags

Communities of Interest

  • Materials and Manufacturing Processes
  • Sensors

DTIC Thesaurus Topics

  • Algorithms
  • Analyzers
  • Angle Of Arrival
  • Background Noise
  • Continents
  • Detection
  • Detectors
  • Estimators
  • Frequency
  • Frequency Domain
  • High Resolution
  • Noise
  • Rhode Island
  • Spectra
  • Spectrum Analysis
  • Time Intervals
  • Wavefronts

Fields of Study

  • Engineering

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Aerospace Engineering
  • Phased Array Antenna Design.

Technology Areas

  • Space
  • Space - Space Objects