Radio Interference Due to Rocket Exhaust Jets: The Measurement and Computer Modelling of Amplitude and Phase Noise Spectra

Abstract

A full description is given of a computer model developed to describe amplitude and phase noise spectra generated by incoherent volume scattering in the turbulent ionised exhaust jet. The experimental method and equipment are described in detail and, by choice of a computer model for the jet velocity and density structure, a comparison is made between the measured and the computed noise power spectrum density functions. The agreement is excellent for the particular moderately ionised jet selected. Velocity turbulence is not found to be significant in establishing the noise spectrum. The radial and longitudinal gradients in the steady mean local velocity within the jet adequately predict the observed spectrum function.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1971
Accession Number
AD0596285

Entities

People

  • H. Williams

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Bandwidth
  • Boundary Layer
  • Chemical Reactions
  • Chemistry
  • Combustion
  • Computer Programs
  • Electromagnetic Radiation
  • Electron Density
  • Fluid Flow
  • Frequency Bands
  • Measurement
  • Power Spectra
  • Radio Frequency
  • Rocket Exhaust
  • Scattering
  • Turbulent Mixing

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Plasma Physics / Magnetohydrodynamics
  • Radio communications and signal processing.