A newly developed system which measures the radio noise in the lower-frequency microwave bands (1-3 GHz) is described. Using this system installed in a van, some statistical properties of automotive noise, received while driving on main streets or expressways in Tokyo, were measured to provide fundamental data for designing mobile communication systems in this frequency band. Variation of the impulse height, received in typical traveling conditions, can be expressed as a log-normal distribution, and impulse emission is Poisson-distributed in time. The statistical properties of the impulse are considered to be almost the same within the frequency band (1-3 GHz); however, the level of the noise differs depending on many conditions, such as the frequency, locations, and times of measurements. In most measurements, the impulse level becomes lower with increases in the frequency range of the measurement. The impulse level observed on streets is greater than that on expressways.
Measurement of automotive radio noise in lower frequency microwave bands (1-3 GHz)
Messung von Funkstörungen bei Kraftfahrzeugen in niederfrequenten Mikrowellenbändern (1-3 GHz)
International Symposium on Electromagnetic Compatibility ; 1 ; 352-357
1989
6 Seiten, 7 Quellen
Conference paper
English
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