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因此短波通信的主要传播路径是天波。The sky wave is the major transmitting way of short-wave communication.

第二天上午我们游览了杨家界的一步登天，空中走廊，乌龙寨，天波府。The next morning we toured the's sweeping, air corridors, Oolong Walled, Tianbo House.

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讨论了天波雷达三个与时间有关的“可用度”的区别。The difference between three "availability" of the sky wave radar are discussed in this paper.

使没个人吃惊的是，第二天波茨先生戴着帽子出现了，帽子在以往相同的位置上。The next day, to everyone's surprise, Mr. Potts turned up with his hat in its normal position.

研究了罗兰-C天波传播时延的稳定性与空间相关性。The stability and space correlation about the sky-wave propagation time-delay in Loran-C system are studied.

主要描述了天波超视距雷达数据处理仿真系统的设计框架、模型建立及系统实现的内容。In this paper, a simulation system of data processing algorithm for high-frequency skywave over-the-horizon radar is described.

从天波切村出来走几分钟就能看到这堆啤酒罐，矿泉水瓶和其他垃圾。This heap of beer cans, mineral water bottles and other material was just a few minutes' walk outside the village of Tengboche.

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主要论述了天波、地波、微波超视距雷达的工作机理及其发展趋势。The operational principles and the development tendencies of sky-wave, ground-wave, and microwave OTH radars are also presented.

高频天波超视距雷达通过电离层的折射作用，具有同时超视距监测大区域范围的能力。High frequency skywave over-the-horizon radar can provide a wide coverage beyond the horizon by means of refraction within the ionosphere.

本文简述了高频天波超视距雷达模式识别、跟踪、座标变换数据处理器概念。In this paper, the conception of the model recognition-tracking-coordinate transfer data processor in HF skywave OTH-B Radar is described.

在天波超视距雷达中，通道之间的频响不一致影响了自适应波束形成的性能。The inconsistency of frequency response between channels degrades the performance of adaptive digital beam-forming in over-the-horizon radar.

天波超视距雷达信号的建模天波超视距雷达信号通过电离层反射之后，可以看作空间许多紧密结合的点源。Establishing the model of sky-wave OTHR By refracting from ionosphere, the sky-wave OTHR signal beam can be treated as many close point sources.

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短波天波传播频率预测是短波天波通信电路性能预测的前提。The frequency prediction of skywave propagation in shortwave band is the precondition of performance prediction of skywave communication circuit.

天波的传播是利用电离层的反射来实现的，尤其是多次反射后可以实现全球通信。The transmission of the sky wave is realized by the reflection from ionosphere, especially after reflecting many times, to achieve global communication.

电离层频率调制导致地表面杂波的多谱勒展宽，极大地限制了高频天波雷达的目标探测性能。Ionospheric frequency modulation causes spreading of the surface clutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars.

天波超视距雷达是低空防御系统中一种有效的预警手段。Sky-wave over-the-horizontal radar is the focus of development of over-the-horizontal radar as an effective early warning method in low altitude air defense system.

从天波切村出来走几分钟就能看到这堆啤酒罐，矿泉水瓶和其他垃圾。这就是差不多一个旅游季的垃圾。This heap of beer cans, mineral water bottles and other material was just a few minutes' walk outside the village of Tengboche. It represents about a season's rubbish.

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罗兰-C采样脉冲信号，这是MATLAB模拟天波干扰的基础上，提出的识别算法，并用ModelSim实现。On the basis of Loran-C sampling pulse signals, which are interfered by MATLAB simulated skywave, an identification algorithm is put forward and realized with MODELSIM.

根据采样值识别标准周期过零点，给出了相位编码信息，在有噪声干扰及天波污染的情况下，提高了周期识别过程的弹性，完全实现了对罗兰-C周期识别的数字化。This method increases the resilience of the identification process in the presence of noise and skywave and realizes the digital of cycle identification algorithm for LORAN-C.

但是，不可避免的遇到几个技术难题，包括无线电传播速度变化的影响，天波干扰问题，以及远近效应问题。Inevitably , some technically difficult problem must be solved, including the variety of speed about tropospheric propagation, the sky wave disturbance and the near-far problem.