ground wave

1. More and more countries pay great attention to HF ( high frequency) ground wave OTHR ( over the horizon radar) for its military and civil foregrounds.
   由于具有良好的军事应用前景和诱人的民用潜力，高频地波超视距雷达越来越受到世界各国的高度重视。
2. This paper introduces the basic principles of Watson-Watt radio direction-finding system, and provides a practical and easy-to-use method to measure close ground wave sgnals.
   简单介绍瓦特森-瓦特无线电测向体制的基本原理，提出了一种简单实用的近距离地波信号的测量方法。
3. Design of Multi-Channel Multi-Frequency HF Ground Wave Radar DDS Digital Signal Generator
   多通道多频高频地波雷达DDS数字信号源的设计
4. A general LXI bus module based on ARM is presented in this paper and can be employed for multi-frequency HF ground wave radar ( HF GWR).
   在以ARM芯片为核心的硬件平台上，设计了一种通用的LXI总线模件，可作为多频高频地波雷达的系统总线。
5. Super-resolution estimation of the ocean surface current for the HF ground wave radar
   高频地波雷达海洋表面流方位的超分辨估计
6. This paper analyzes the background of detection for high frequency ground wave over-the-horizon radar, discusses the performances of constant false alarm rate detector, provides a method to solve the problem of multiple targets and fluctuate clutter, introduces a efficient parallel detection system composed of transputers.
   分析了高频地波超视距雷达信号检测的背景，讨论了恒虎警检测器的性能，提出了解决多目标与起伏杂波效应的方法，介绍了使用晶片计算机构成的并行检测处理系统。
7. HF ground wave over-the-horizon radar is playing a more and more important role in modern wars and civil projects.
   高频地波超视距雷达在现代战争和民用事业中发挥着越来越重要的作用。
8. Lateral seismic response analysis of end bearing pile under the influence of bedded ground wave motion and radiant damping
   端承桩在层状地基波动与辐射阻尼影响下的横向地震反应分析
9. Engineering Application Method of Data Association for HF Ground Wave Radar
   适于高频地波雷达工程应用的数据关联方法
10. Self-calibration method of channel amplitude of HF ground wave radar based on sea echo
    高频地波雷达基于海洋回波的通道幅度自校准方法
11. Finally, the propagation and the attenuation of the ground wave of hammer vibration are discussed.
    最后分析了气锤振动的地面波的传播和衰减。
12. 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.
    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。
13. This paper detailedly studies the application of frequency coded pulse signal ( FCP) to a high frequency ground wave over the horizon radar by designing signal waveform and processing.
    本文就脉冲频率编码信号应用到高频地波超视距雷达中，进行了较详细的波形设计和处理研究。
14. The binding energy is discussed in terms of the probability of the ground wave function.
    从基态波函数概率分布的角度，讨论了激子的束缚能。
15. Experiments prove this design can satisfy the requirement of next HF ground wave radar made by Wuhan university.
    实验证明该设计可以减化雷达体系结构，可实现雷达工作参数的可编程性，满足了武汉大学研制的下一代高频地波海洋监测雷达的需要。
16. A method for super-resolution estimation of the ocean surface current for the HF ground wave radar is presented based on spatial correlation of the ocean surface current being analyzed.
    在对洋流相关性分析的基础上，提出了一种适用于高频地波雷达海洋表面流方位的超分辨估计方法。
17. Application of Frequency Coded Pulse Signal in a Ground Wave Over the Horizon Radar
    脉冲频率编码信号在高频地波超视距雷达中的应用
18. A New Compensation Method for HF Ground Wave Radar Receiving System
    一种新的高频地波雷达接收系统补偿方案
19. The application of time-frequency combined processing in ground wave HF radars
    时频联合处理方法在地波高频雷达中的应用
20. A Low-IF responder used to scale the radar and realize the channel amplitude calibration of the HF ground wave radar is presented in this paper.
    为了解决雷达定标和通道校准，比较了高频地波雷达应答器的结构，提出了使用低中频方式设计应答器的方案。
21. The HF ground wave radar receiver system based on USB2.0 technique is introduced.
    介绍了基于USB2.0技术的高频地波雷达接收机系统。
22. 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.
    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。
23. The performance of HF ground wave radar may be affected by all kinds of radio-frequency interferences ( RFI).
    高频地波雷达工作在短波波段，回波信号容易受到各种射频干扰的影响，恶化系统的性能。
24. As a device match of the high frequency ground wave radar, the responder'working is correlating with the radar.
    作为高频频地波雷达的配套器件，应答器的工作方式和雷达密切相关。
25. Study of the Polarization Filtering Technique of HF Ground Wave Radar
    高频地波超视距雷达的极化滤波技术研究
26. LFM signal and PCM signal are the two most frequently used format of ground wave signals.
    LFM信号和二相编码信号是地波雷达常用的两种信号形式。
27. The introduction of the odd items into account lateral variation of seismic ground wave velocity.
    奇次项的引入考虑了地层横向变化对地震波速度的影响。
28. Based on the signal resolution and detection mechanism of HF ground wave OTHR, the differences between the coherent demodulation and the non-coherent demodulation are analyzed, according to the phase noise power spectral density.
    基于高频地波OTHR的信号分辨与检测机理，从相位噪声功率谱密度的角度对相参解调方式和非相参解调方式进行了比较分析。
29. The mobile bistatic ( multistatic) radar of this paper is a combination of bistatic ( multistatic) radar and shipborne high-frequency ground wave over-the-horizon ( OTH) radar.
    本文所介绍的移动双（多）基地雷达系统是双（多）基地雷达和舰载的高频地波OTH（超视距）雷达两种体制雷达的结合。
30. The Multi-static High-frequency Over-the-horizon Ground Wave Radar is an offshore use, multistation, high-frequency over-the-horizon ground wave radar which is used to detecting ships objectives compatible with aircraft objectives.
    多基地高频超视距地波雷达是一部岸用、多站、兼容探测舰船和飞机目标的高频超视距地波雷达，可对大距离范围内的海面舰船和空中飞机实现实时的超视距探测和跟踪。

noun

1. a radio wave propagated on or near the earth's surface