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Beam intensity striations and applications.

T C Yang1

  • 1Naval Research Laboratory, Washington, DC 20375, USA. yang@wave.nrl.navy.mil

The Journal of the Acoustical Society of America
|March 27, 2003
PubMed
Summary
This summary is machine-generated.

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Array beamforming enhances signal detection, allowing measurement of the waveguide invariant parameter "beta." This method reveals consistent striation patterns in beam spectrograms, enabling effective interference suppression in underwater acoustics.

Area of Science:

  • Underwater acoustics
  • Signal processing
  • Wave propagation

Background:

  • Continuous broadband signals produce striated bands in single-element spectrograms.
  • The slope of these striations relates to the waveguide invariant parameter (beta).

Purpose of the Study:

  • Analyze and model striation patterns in beam outputs from horizontal line arrays.
  • Investigate the use of array beamforming for measuring the waveguide invariant parameter.
  • Explore interference suppression techniques using beam spectrogram striations.

Main Methods:

  • Conventional beamforming applied to horizontal line array data.
  • Analysis of signal beam spectrograms as a function of range and frequency.
  • Modeling of striation patterns for broadside and non-broadside signals.

Related Experiment Videos

Main Results:

  • Beam spectrograms exhibit the same striation pattern (slope) as single-element spectrograms.
  • Array gain enables measurement of the waveguide invariant parameter for weak signals.
  • Sidelobe beams show different striation patterns compared to signal beams.
  • Distinct striation patterns differentiate targets and interference sources based on range-rate.

Conclusions:

  • Array beamforming effectively measures the waveguide invariant parameter.
  • Striation pattern analysis in beam spectrograms can distinguish targets from interference.
  • Demonstrated 5-7 dB interference suppression using simulated data through striation analysis.