基于WHU甚低频探测系统的大气噪声监测

Monitoring of atmospheric noise based upon data obtained by WHU VLF detection system

大气噪声由来源于远处闪电的背景噪声和近处闪电的脉冲噪声共同构成,会对甚低频通信造成严重的影响。文章首先利用武汉大学(WHU)甚低频探测系统随州站(31.57°N, 113.32°E)2个不同季节月份的观测数据,把大气噪声分为闪电脉冲噪声和背景白噪声,选择3个典型的频段(6、16和27 kHz)进行分析,获取了大气噪声分布特性以及不同种类噪声贡献度的基本信息;之后通过与CCIR大气噪声模型提供的数据进行对比分析,考查了CCIR模型在中国大陆地区的准确性;最后,利用随州站长达2年的观测数据,对4~27 kHz之间16个频率上的大气噪声进行了统计分析,获得了该地区大气噪声的统计分布特性。

The atmospheric noise includes the background noise from distant activities of lightning and the neighboring pulse noise of lightning. Based on a two-month observation data obtained by the WHU very-lowfrequency(VLF) detection system at the Suizhou station(31.57°N, 113.32°E), the atmospheric noise is divided into the lightning impulse noise and the background noise. The noise intensities at three typical frequency bands(6, 16 and 27 kHz) are selected for a detailed analysis to obtain the basic information about the distribution characteristics of the atmospheric noise and the relative contributions of different types of noise to the total noise level. The accuracy of the CCIR atmospheric noise model in the mainland of China is also investigated by quantitative comparisons with the observations from the WHU VLF detector. A statistical evaluation of the atmospheric noise is conducted using a two-year(2016-2017) database of the WHU VLF detection system at Suizhou for 16 specific frequencies in range of 4-27 kHz to establish the statistical distribution profile of the atmospheric noise in this region.