查询词典 skywave

Communication countermeasure simulation system ; HF skywave transmission loss ; Simulation procedure ; Simulation model

通信对抗仿真系统；短波天波传输损耗；仿真流程；仿真模型

China may have as many as three OTH skywave radar systems to track maritime movements in China's contiguous seas and most likely to serve as part of an effort to develop the capability to track and target US aircraft carriers.

中国可能拥有多至三部超视距天波雷达系统，用以跟踪中国邻近海区的海上活动，最有可能作为发展跟踪和瞄准美国航空母舰的能力的一个组成部分。

Based on the channel transmission theory,a complete and concise procedure for calculating the HF skywave's transmission loss is proposed in this paper by using and optimizing the available independent and disperse models reasonably.

根据信道传输理论，在合理选用和优化各种现有的独力分散数学模型的基础上，设计了一种完整而简洁的短波天波传输损耗计算流程，并针对流程中的每一步给出了详尽的数学模型。

The Skywave Over-the-Horizon Radar operates in high frequency band (3-30MHz) and employs the ionosphere to reflect signal to detect targets from the top down.

天波超视距雷达工作在3—30MHz的高频频段，利用电离层对高频信号的反射作用自上而下地进行目标探测。

However, this is mostly true for signals we receive directly, like noise sources, and not so much for signals from broadcast stations coming to us through skywave propagation. I aim the antenna for minimum noise pickup, which results in the best signal to noise ratio. In some situations it is quite possible to fully tune out a noise source such as a TV or computer monitor.

喜欢听干扰台的有福了，VOA和干扰台的信号不会是一个方向来的，把环对准VOA信号最强的方向，那么在另外方向的干扰信号就会衰减，VOA来的斗争指示你会听得更清），我更感兴趣的是最小噪声拾取，这会带来会好的信噪比，在一些情况下，很有可能将电视或电脑带来的噪声剔出出去。

The work mode and environment of the skywave over-the-horizon radar is relatively complicated. Affected by external nonstationary noise and clutters easily, the locating accuracy detection probability and data rate of this radar are different from general radar.

天波超视距雷达的工作方式和工作环境比较复杂，雷达的定位精度、检测概率和数据率与常规雷达不同，容易受外部噪声和杂波的影响。

The skywave Over-the-Horizon Radar operates in high frequency band (3-30MHz) and employs the ionosphere to reflect signal to detect targets from the top down.

天波超视距雷达(Over-the-Horizon Radar—OTHR)工作在3—30MHz的高频频段，利用电离层对高频信号的反射作用自上而下地进行目标探测。

The ML-90 Magnetic Loop Antenna is without doubt the best type of antenna for NVIS (near vertical incidence skywave) operations.

目前从世界范围看，唯一能够实现NVIS传播的就是单电磁环天线，也称为半环天线。

So it was last week in Selma , alabama.

上星期在亚拉巴马州塞尔马市发生的事件也是这样一个转折点。

The group also spearheads various social programs in China.

该组织还带头参与中国的各种社会活动。