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

摘要

Measurements of the amplitude probability distribution of the envelope and measurements of other parameters of automobile ignition noise were made at frequencies between 24and 30MHz. 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 20vehicles per minute) and for heavy traffic (approximately 45vehicles per minute). The principal instrumentation consisted of several phase-stable receivers with coherent quadrature detectors whose outputs were digitized at a rate of 200samples per quadrature component per second and recorded on magnetic tape for computer processing. (Modified author abstract)