BROADBAND ADAPTIVE BEAMFORMING IN THE PRESENCE OF TRANSIENT INTERFERENCE

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Authors
  1. Niezgoda, G.
  2. Krolik, J.
  3. Swingler, D.N.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Concordia Univ, Montreal QUE (CAN) Dept of Electrical and Computer Engineering
Abstract
This report proposes a multiple time-scale version of the cascaded modular minimum variance distortionless response ( square m VDR) beamformer to allow simultaneous suppression of both transient and continuous interfaces. To cancel short duration interfers, the multiple stage beamformer computes a small number of weights assigned to a stage on a time-scale approximating the duration of the interferer. Since the stage has fewer weights to compute than the total number available to the beamformer, a reduction in adaption time is possible without incurring performance degradation from weight noise variance. To combat long duration interference events, other beamformer stages apply the remaining weights which in turn may be adapted over a longer period. In this paper, closed from expressions relating adaptation time and adaptive degrees of freedom to mean output power, mean-squared error and output signal-to-noise ratio are derived for the square m VDR beamformer. Simulation experiments demonstrate the applicability of the beanformer when wavefield measurements contain short duration interference components.
Keywords
Transients;Adaptive processing
Report Number
DREA-CR-94-405 — Contractor Report
Date of publication
01 Jan 1994
Number of Pages
184
DSTKIM No
96-00657
CANDIS No
154196
Format(s):
Document Image stored on Optical Disk;Hardcopy

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