空—地二层介质下极低频电场特性研究

Study on ELF electric field characteristics in air-ground two-layer medium

摘要:

极低频电磁波在浅海与深海资源勘探、海洋污染源实时监控、自然灾害预测、海上辅助导航、国防监测等方面有广泛的应用,对其进行研究具有重大的国防意义。本文介绍了开展的陆上极低频电场特性试验,理论分析与试验结果相结合,验证了水平电偶极子产生电场强度的传播衰减规律,试验结果表明：收发距0-10 km时,信号响应强度快速衰减,10-25.4 km时,信号强度衰减由快速变为缓慢,超过25.4 km后信号响应趋于平缓；为了证明电磁波传播时地下信道的存在,进行了波速测量,试验结果表明：陆上1Hz透地电磁波的波速约为55km/S,对应电导率 =0.0033S/m,证明了地下信道的存在。

Abstract:

Extremely low frequency electromagnetic wave has been widely used in shallow sea and deep sea resource exploration, Marine pollution source real-time monitoring, natural disaster prediction, Marine assisted navigation, national defense monitoring and so on. It is of great national defense significance to study it, this paper introduces the test of the characteristics of ELF electric field on land. Combining the theoretical analysis with test results, the propagation attenuation law of electric field intensity generated by HED is verified. The test results show that the signal response intensity decays rapidly when the transmitter-receiving distance is 0～10 km, and the signal intensity decays slowly when the transmitter-receiving distance is 10～25.4 km. The signal response flattens out after 25.4 km. In order to prove the existence of underground channel when electromagnetic wave propagates, the wave velocity measurement experiment is carried out, the test results show that the wave velocity of 1Hz electromagnetic wave on land is about 55km/S, corresponding to the conductivity σ= 0.0033S/m, which is proved the existence of underground channel。