An Improved Kalman Filter Excisor for Suppresing Narrowband Gaussian Noise Interference

Abstract

This technical note presents an improved Kalman filter excisor for dealing with narrowband Gaussian noise. For this type of interference, both envelope and phase vary with time. Since the Kalman filter approach is close to optimum for interferers with constant or very slowly varying envelopes, performance for the narrowband Gaussian noise case will be significantly less than optimum. Ways and means of improving the performance by up to 5 dB are presented. These include the use of an alternate filtering approach to estimate the envelope to counter group delay effects, and phase-smoothing to suppress some of the additional noise caused by temporary loss of lock by the Kalman filter during those instants when the envelope changes sign.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1992
Accession Number
ADA263371

Entities

People

  • Brian Kozminchuk

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Bandpass Filters
  • Bandwidth
  • Communication Systems
  • Electronic Support Measures
  • Estimators
  • Filters
  • Filtration
  • Frequency Bands
  • Gaussian Noise
  • Kalman Filtering
  • Kalman Filters
  • Low Pass Filters
  • Narrowband
  • National Security
  • Phase
  • Security
  • Spread Spectrum

Fields of Study

  • Engineering

Readers

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