甚低频

应用半经验方法对甚低频（VLF）传播相位的C层效应进行了分析和建模，改进了VLF传播相位预测函数。

Using half-empiric method , C-layer effect of very low frequency ( VLF ) propagation phase is analyzed and modeled , moreover , the function of VLF phase prediction is modified .

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 .

太阳X射线爆发与甚低频传播相位异常关系的研究

Study on the Correlation between the Solar X-ray Burst and the VLF Phase Anomaly

应用FDTD法分析甚低频传播特性

Numerical Simulation of the VLF Propagation Characteristic by Applying FDTD Method

甚低频（VLF）法在固体矿产普查中的应用及效果

Application and effect of VLF method in prospecting for solid mineral resources

甚低频电磁法（VLF-EM）是可以选择的对象。

VLF-EM ( very low-frequency electromagnetism ) is a suitable mean to resolve problems .

RaA氡气、甚低频测试在复核某电站库首变形体边界中的应用

Application of Boundary Checking with RaA Radon , VLF Survey in Deformation and Fracture Mass of Reservoir Right Shore to an Electricity Station Dam

甚低频（VLF）电磁法是以电磁波为场源，通过探测场的参数变化获得电性局部差异，从而认识被测目标的一种勘探手段。

By using electromagnetic wave to get the difference variable parameter of the partial electric property , VLF electromagnetic method is an effective means to obtain the parameter of the measured objective .

VW-83型便携式宽带甚低频接收机

VW-83 Portable Broadband VLF Receiver

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 .

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 .

分析表明，近赤道季风区显著低频振荡是ELNino发生发展的一个重要前兆，低频振荡能量向甚低频段的转移和输送可能是ELNino发生的一个重要机理。

It is also indicated that the notable ISO is an important auspice for the occurrence and the development of El Nino . The process of low frequency transition to the lower frequency fluctuation energy is an important mechanism associated with the occurrence of El Nino .

沿该断裂实测22条甚低频测线，其中16条测线结果显示出水平电场及电阻率的低值异常，其异常范围宽度60～120m。

The sixteen out of twenty-two observational Very Low Frequency surveying lines along the fault demonstrate low value anomalies of horizontal e - lectric field and resistivity , and the width of the anomaly extension is 60 ~ 120m .

与地震有关的电离层扰动的甚低频/低频无线电探测

VLF / LF radio sounding of ionospheric perturbations associated with earthquakes

单运放甚低频正弦波振荡器

Single Op-Amp Sinusoidal Oscillators Suitable for Generation of Very Low Frequencies

航空甚低频电磁系统深部地质信息的超低频电磁探测研究

Study of Ultra-Low Frequency Electromagnetic Wave Exploration to Deep Geological Information

甚低频电磁法确定覆盖层厚度的原理及应用

Principle and application of the VLF electromagnetic method to determine overburden thickness

甚低频遥控水雷的可行性分析与系统设计

Feasibility and System Design of Very Low Frequency Electromagnetic Remote-Controlled Naval Mine

卷积码和Turb0码在甚低频通信系统中的应用研究

Applied research of convolutional code and turbo code in VLF communication system

时间域航空电磁资料小波去噪方法研究航空甚低频电磁系统

Research of Wavelet Denoising in Time-domain Airborne Electromagnetic Data Processing

强噪声环境下测量甚低频天线阻抗方法的研究

Measurement of VLF transmitting antenna impedance in intensive atmospheric noise

用边界元法求解复杂条件下甚低频法电磁异常

Computation of VLF electromagnetic anomalies by BEM in complex condition

甚低频通信系统的自适应算术数据压缩研究

Analysis of the Arithmetic Coding Adaptive Data Compression for a VLF Communication System

因电磁脉冲源引起的光辐射和甚低频微扰

Emissions of light and very low frequency perturbations due to electromagnetic pulse sources

甚低频横跨极区传播相位的观测与研究

Observation and study on phase of very low frequency propagation over polar area

甚低频传播相位变化的某些规律的分析研究

Analyses and Studies on Some Regularities of the Phase Change of VLF Propagation

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 .

甚低频电磁法的地形影响

The terrain effect on vlf - EM method

基于差分甚低频定位信息的惯导输出校正

INS Output Revising Based on Differential VLF Position

甚低频带辐射场系统

Very low frequency band radiated field system