Prediction Method and Proof Measurement of LF Standard Frequency Waves
Prediction Method and Proof Measurement of LF Standard Frequency Waves
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低频标准频率波的预测方法及验证测量
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
Nozaki Kenro
中科院分区：
文献类型：
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作者：
Tsuchiya Shigeru;Imamura Kuniyasu;Ito Hiroyuki;Maeno Hideo;Kubota Minoru;Nozaki Kenro
除了远至美国西海岸、欧洲和新西兰的游客。一般情况下，沿地面传播的地波合成波和在电离层区域底部反射的天波都在低频波段接收。尽管与中频和高频无线电波相比，太阳和地磁活动引起的电离层变化对低频传播的影响较小，但强烈的太阳和地磁活动[3]以及低层大气中的波动[4]有时会干扰低频传播。低频无线电波在安静条件下的电场强度是根据国际电信联盟无线电通信部门（ITU-R）建议P. 684-5“预测频率低于150 kHz的电场强度”[5]计算的。然而，波导模式的计算方法是推荐的
ception from as far away as the U.S. West Coast, Europe and New Zealand. In general, the synthetic waves of ground waves propagating along the ground and sky waves refl ected at the bottom of the ionospheric region are received in the LF band. Although ionospheric variation due to solar and geomagnetic activity less affects LF propagation in comparison to MF and HF band radio waves, severe solar and geomagnetic activities [3] and fl uctuations in the lower atmosphere [4] sometimes disturb LF propagation. Electric fi eld strength of LF radio wave under quiet conditions is calculated according to International Telecommunication Union Radiocommunication Sector (ITU-R) Recommendation P. 684-5 “Prediction of fi eld strength at frequency below 150 kHz” [5]. However, the waveguide mode method for calculations is recommended for