在大型电力系统中存在有自生的甚低频系统振荡。
In large interconnected power system, there have been spontaneous system oscillations at very low frequencies.
简要叙述了甚低频电磁法的方法技术，并以山城金矿为例。
This paper briefly discusses the very low frequency (VLF) electromagnetic technique and takes Shancheng gold mine for example.
分析甚低频电磁波传播路径与方式，给出场强的计算公式。
By analyzing transmission pathway and mode of VLF radio wave, calculation formula of field intensity is given.
本文对大功率甚低频发射天线用绝缘子的选型进行了研究。
The selection of the insulator applied for a large power very low frequency transmitting antenna were studied.
提出一种加载机动甚低频天线的方式，对加载参数进行了优化。
A loading scheme is proposed for the mobile Very-Low-Frequency antenna, and loading parameters are optimized.
清管及挤涂工具的阻卡探测系统是采用甚低频无线电波发射、接收。
Cloge detection system of pigging and extrusion tools is adopting very-low-frequency radiowave emission and reception.
在茫茫大洋深处，唯一可用的通信手段就是甚低频或者极低频无线电。
Out in the no-mans land of the international waters are the only means of communication with the submarines to use radio in the vlf or elf range.
我们可通过自适应算术编码压缩来提高甚低频通信系统的数据传输率。
We expect to increase the throughput by arithmetic coding adaptive data compression technique.
应用时域有限差分（FDTD）方法分析甚低频在地电离层波导中的传播特性。
The propagation characteristic of the VLF in the earth-ionosphere waveguide is analyzed by applying the FDTD method.
机载甚低频天线系统中的双拖曳天线是用于对潜通信VLF/LF的发射天线。
The Dual Trailing Wire Antenna(DTWA) on an Aircraft antenna system is used to transmit VLF/LF messages to submarines.
利用两种能够引导甚低频电磁波的导管模式，求得哨声导管中磁场和电流的分布。
By using two kinds of model of ducts in which the VLF electromagnetic waves are guided, we obtain the distributions of magnetic field and current in the whistler duets.
甚低频电磁法(VLF - EM)，具有仪器轻便、方法简单、经济高效等优点。
The very low frequency electromagnetic method (VLF-EM) has such advantages as portable instrument, simple method, economical and high efficiency.
甚低频电磁法(VLF - EM)，具有仪器轻便、方法简单、经济高效等优点。
The advantages of VLF-EM method are portable, simple, economic and efficient.
此方案可有效解决甚低频信号传输中的干扰问题，并为下一步的甚低频信号数字处理提供了基础。
It could overcome the transmission interference, and could be the fore part of the VLF digitized receiver.
说明甚低频电磁法和EH4电磁成像系统的联合应用是草原浅层覆盖区找寻隐伏矿体的有效技术方法。
Hence, the integrated application of VLF-EM and EH4 conductivity image system is efficient to forecast the location of the buried ore-bodies in grasslands.
甚低频(VLF)电波传播过程中因环境因素影响会使信号产生衰减与扰动，导致潜艇收信可靠性下降。
The signal will have attenuation and disturbance due to environmental factors in the process of VLF radio wave propagation, which will impact the reliability of submarine communication.
在考虑了开销之后，我们得出结论，自适应算术编码压缩技术确确实实能够为甚低频通信系统提高数据传输率。
After determining the overhead requirements, we conclude that the arithmetic coding adaptive data compression technique can provide a substantial increase in throughput for this system.
本文论述了一种基于软件无线电的甚低频低码率语音数字岩层通信机，它采用了QPSK调制和FEC信道编码技术。
This paper deals with a digital speech communicator of very low frequency and low bit digital communication based on software ratio, which USES the technique of QPSK and FEC coding.
在大西洋中部，海水的盐度为3.2%，甚低频无线电信号可以穿透到海面下10 ~20米的深度，几乎就是现代大型潜艇的潜望镜深度。
In the middle of the Atlantic ocean, with a salinity of 3.2 %, a VLF signal will penetrate down to a depth of 10-20 meter, barely periscope-depth for a modern large scale submarine.
在大西洋中部，海水的盐度为3.2%，甚低频无线电信号可以穿透到海面下10 ~20米的深度，几乎就是现代大型潜艇的潜望镜深度。
In the middle of the Atlantic ocean, with a salinity of 3.2 %, a VLF signal will penetrate down to a depth of 10-20 meter, barely periscope-depth for a modern large scale submarine.
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