Non-Stationary Interference Cancellation in HF Surface Wave Radar

Abstract

High frequency (HF) interference in surface wave over-the-horizon (OTH) radars typically exhibits a time-varying or non-stationary spatial structure. Adaptive beamformers that update the spatial filtering weight vector within the coherent processing interval (CPI) are likely to suppress such interference most effectively, but the intra-CPI antenna pattern fluctuations result in temporal de-correlation of the clutter which severely degrades sub-clutter visibility after Doppler processing. A robust adaptive beamformer that effectively suppresses non-stationary interference without degrading sub-clutter visibility is proposed. The new algorithm is computationally efficient and suitable for practical implementation. Its operational performance is evaluated using experimental data recorded by Iluka HF surface wave (HFSW) OTH radar, located near Darwin in far north Australia.

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Document Details

Document Type
Technical Report
Publication Date
Apr 14, 2005
Accession Number
ADA445346

Entities

People

  • Alex B. Gershman
  • Giuseppe A. Fabrizio
  • Mike D. Turley

Organizations

  • Defence Science and Technology Group

Tags

Communities of Interest

  • C4I
  • Ground and Sea Platforms
  • Materials and Manufacturing Processes
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Algorithms
  • Cancellation
  • Clutter
  • Detection
  • Doppler Effect
  • Frequency
  • Ground Clutter
  • Information Operations
  • Over The Horizon Radar
  • Radar
  • Radar Signals
  • Signal Processing
  • Stationary
  • Surface Waves
  • Surveillance
  • Wave Propagation
  • Waves

Fields of Study

  • Engineering

Readers

  • Image Processing and Computer Vision.
  • Phased Array Antenna Design.
  • Radar Systems Engineering.