Measurements of Amplitude Probability Distributions and Power of Automobile Ignition Noise at HF

Abstract

Measurements of the amplitude probability distribution of the envelope and measurements of other parameters of automobile ignition noise were made at frequencies between 24 and 30 MHz. The measurements were conducted at a quiet site where several single stationary vehicles were operated at engine speeds corresponding to idle and cruise. Measurements were also made at two distances near a freeway, for light traffic (approximately 20 vehicles per minute) and for heavy traffic (approximately 45 vehicles per minute). The principal instrumentation consisted of several phase-stable receivers with coherent quadrature detectors whose outputs were digitized at a rate of 200 samples per quadrature component per second and recorded on magnetic tape for computer processing.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1973
Accession Number
AD0775643

Entities

People

  • Richard A. Shepherd

Organizations

  • SRI International

Tags

DTIC Thesaurus Topics

  • Amplitude
  • Communication Systems
  • Computer Programming
  • Data Processing
  • Detectors
  • Digital Communications
  • Frequency
  • Ignition Systems
  • Intensity
  • Measurement
  • Noise
  • Peak Values
  • Probability
  • Probability Distributions
  • Recording Systems
  • Test Vehicles
  • Vehicles

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Electrical Engineering
  • Optical Physics and Photonics.