地波传播

随机粗糙海面上地波传播衰减因子

Attenuation factor of ground wave propagation across the rough sea

本文把求解半空间散射问题的FDTD技术与地波传播理论相结合，研究任意复杂目标的地波散射特性。

In this paper , the ground wave scattering from a complex target is investigated by combining the FDTD technique of solving the semi-space scattering problem with the theory of ground wave propagation .

罗兰c台链地波传播修正模型及实验确定

The Correction Model of Groundwave Propagation of Loran-c Chain and Its Experimental Determination

基于FDTD的罗兰-C信号地波传播特性的时域分析

Time-domain analysis on Ground-wave propagation Characteristics of Loran-C Based on FDTD Method

然而，低频地波传播时延误差限制着罗兰C系统的定位精度，对传播时延进行有效修正可提高罗兰C定位精度。

However , the positioning accuracy of Loran-C system is limited by the time-delay error of the low-frequency ground-wave propagation and can be increased by correcting propagation time-delay .

有了它，就可以非常方便容易地用不同模型计算广阔区域接收多个长波信号在各种典型路径上的ASF和地波传播时间延迟和提高定时精度。

The ASF and the ground propagation delay of long-wave signal from many stations in different typical path for wide area , can be easy computed and improved in timing accuracy with different model by this GIS software .

提出了一种基于高频地波传播的船只导航定位系统设计方法。

A design method of marine navigation and positioning based on high-frequency ground-wave propagation is presented .

除此之外，雷达目标散射截面积和地波传播衰减特性也和雷达工作频率有关。

In addition , the radar target cross section and surface wave propagation attenuation characteristics are also related to the radar operating frequency .

地波传播受天气的影响较小，比较稳定，信道参数基本上不随时间的变化而变化，是恒参信道。

The transmission of the earth wave is stable , hardly influenced by climate and its channel parameter does not change with time basically , it is Constant Parameter Channel .

低频地波传播时延修正的理论预测是传播时延修正的主要方法，而大地等效电导率的精度又是影响修正量理论预测精度的主要因素。

The theoretic forecast is the main way to the correction of propagation time-delay , and the earth equivalent conductivity is the key factor which influences the theoretic prediction accuracy of the propagation time-delay correction .

高频地波雷达传播特性及其探测距离分析

Analysis of propagation characteristics and detection range of HF surface wave radar

预测地波定时信号传播时延的经验方法

Experimental Method for Forecasting Propagation Delay of Ground Wave for Timing Signal

天地波高频雷达利用天波反射/地波绕射的传播模式，能够探测到视距以外的海面舰船和低空飞行目标。

High frequency hybrid sky-surface wave radar utilizes ionosphere reflection and surface diffraction propagation modes to detect targets beyond the horizon such as vessels on the sea and low altitude flying targets .

超视距雷达地波沿光滑海面传播损耗的计算

Propagation Loss of Ground Wave for OTH Radar above Smooth Sea

粗糙海面对高频雷达地波空间场分量传播损耗的影响

Study of the influence of rough sea surface on the space field of HF ground-wave radar on coast

采用指数大气模型和实际海水电参数，通过对光滑球形地面上Rotheram地波场计算公式进行修正，计算得到了不同海态时海面上地波传播衰减因子。

Using the exponetial atomsphere model , the realistic electric parameter of sea water , and combining with Rotheram 's ground wave formula , the ground wave attenuation factors for different sea state are obtained .