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气噪声(国外英文资料)
气噪声(国外英文资料)
Atmospheric noise (atmospheric noise) is the electromagnetic radiation generated by the nature of thunderstorm activity, also known as static. The atmospheric noise in any part of the earth is the superposition of Lightning Radiation in other areas and Lightning Radiation in this region. By the static level and close to the distance from the center of the lightning. There is a certain geographical distribution of lightning activity in the world, namely, the middle and lower latitudes are more, while the polar regions are less. Indonesia, central and South America and equatorial Africa are the three major lightning centres in the world. From the time point of view, the summer is generally more strong, less winter and weak, while the local lightning occurred in the evening. In the lightning near zone radiation spectrum is very wide, the maximum value is about 5 kHz; in the far zone, due to the attenuation, the remaining spectrum of the low frequency part, and two maximum values were between 1 kHz and 7 kHz to 20 below the minimum value at about 4 kHz.
Edit this section of atmospheric noise interference
Atmospheric noise mainly interferes with radio systems at all frequencies below the frequency band. However, local lightning, especially in the tropics, will have a serious impact on medium and short wave. Atmospheric noise levels generally decrease with increasing frequency. But during the daytime, the waves in the ionosphere absorb and decrease with the increase of frequency, so the atmospheric noise level in the shortwave band increases with frequency. At night, the absorption of the ionosphere is generally small, the atmospheric noise level is almost independent of frequency, and the impact of atmospheric noise is gradually weakened for more than 30 mhz.
Edit the measurement of atmospheric noise in this section
Atmospheric noise is usually expressed by statistical values of the noise level per unit bandwidth. Atmospheric noise is external noise, so it h
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