Measurements of Electromagnetic Radiation from Automotive Ignition Systems

This paper reports a set of measurements of automotiveingnition-system electromagnetic radiation (EMR). The measurements were obtained in terms of external antenna noise figure and voltage deviation. A variety of vehicle EMR sources were studied at 4 relatively widely separated frequencies. Two independent measurement methods were used, each involving a separate statistical signal-processing procedure. The results of these two measurements compared quite favorably. These measurements provide data in support of an earlier paper in which a model is presented for assessing the statistical significance of the inteference of EMR sources. That model calls upon a widely respected data base for man-made interference which is published by the Institute of Telecommunication Science of the National Bureau of Standards.