very low frequency

简明释义

甚低频

英英释义

例句

1.The very low frequency sound was barely audible to human ears but could be detected by animals.

这个非常低的频率声音对人耳几乎不可闻，但动物可以检测到。

2.In seismology, very low frequency waves can indicate large earthquakes.

在地震学中，非常低的频率波可以指示大型地震的发生。

3.The radio station broadcasts on a very low frequency, which is ideal for long-distance communication.

这个电台以非常低的频率进行广播，非常适合远程通信。

4.The submarine communicated using very low frequency signals to avoid detection.

潜艇使用非常低的频率信号进行通信，以避免被发现。

5.Scientists use very low frequency waves to study the Earth's magnetic field.

科学家使用非常低的频率波来研究地球的磁场。

作文

In the realm of telecommunications and broadcasting, the term very low frequency refers to a specific range of radio frequencies that lie between 3 kHz and 30 kHz. This frequency range is significant for various applications, especially in the field of long-distance communication. The characteristics of very low frequency waves allow them to travel long distances and penetrate through obstacles like buildings and mountains, making them ideal for certain types of communication systems.One of the most notable uses of very low frequency is in submarine communication. Submarines often operate at great depths where traditional radio waves cannot reach. However, the long wavelengths associated with very low frequency signals can travel through seawater, enabling submarines to communicate with command centers without surfacing. This capability is crucial for maintaining operational security and ensuring the safety of naval operations.Moreover, very low frequency signals are also used in navigation systems. For instance, the LORAN (Long Range Navigation) system utilizes these frequencies to provide accurate positioning information to ships and aircraft. This technology has been particularly useful in areas where GPS signals may be weak or unavailable, such as in dense urban environments or remote locations.In addition to military and navigation applications, very low frequency is also employed in scientific research. Researchers use these frequencies to study the Earth’s ionosphere, which is essential for understanding radio wave propagation. By analyzing how very low frequency signals behave as they travel through the ionosphere, scientists can gain insights into atmospheric conditions and improve communication technologies.However, it is important to note that while very low frequency has its advantages, it also comes with limitations. The bandwidth available for very low frequency transmissions is relatively narrow, which means that data rates are lower compared to higher frequency bands. This limitation makes it less suitable for applications that require high-speed data transmission, such as modern internet communications.Furthermore, the large antennas required for transmitting very low frequency signals can be impractical for some users. These antennas need to be significantly larger than those used for higher frequencies, which can pose challenges in terms of installation and maintenance. Despite these drawbacks, the unique properties of very low frequency make it an invaluable tool in specific contexts.In conclusion, the concept of very low frequency encompasses a range of radio frequencies that play a vital role in various fields, including military communication, navigation, and scientific research. While it has its limitations, the ability of very low frequency signals to travel long distances and penetrate obstacles ensures that they remain relevant in today's technological landscape. As we continue to advance our understanding of radio frequencies, the significance of very low frequency will likely persist, adapting to meet the needs of future innovations in communication and navigation.

在电信和广播领域，术语非常低频指的是一种特定的无线电频率范围，该范围介于3 kHz和30 kHz之间。这个频率范围对于各种应用具有重要意义，尤其是在远程通信领域。非常低频波的特性使其能够长距离传播并穿透建筑物和山脉等障碍物，使其成为某些类型通信系统的理想选择。非常低频的一个显著用途是在潜艇通信中。潜艇通常在深海中操作，在那里传统的无线电波无法到达。然而，与非常低频信号相关的长波长可以穿透海水，使潜艇在不浮出水面的情况下与指挥中心进行通信。这种能力对于保持作战安全和确保海军行动的安全至关重要。此外，非常低频信号还用于导航系统。例如，LORAN（长距离导航）系统利用这些频率为船只和飞机提供准确的定位信息。这项技术在GPS信号可能较弱或不可用的地区特别有用，例如在密集的城市环境或偏远地区。除了军事和导航应用，非常低频还被用于科学研究。研究人员使用这些频率来研究地球的电离层，这对于理解无线电波传播至关重要。通过分析非常低频信号在电离层中的传播行为，科学家们可以深入了解大气条件并改善通信技术。然而，值得注意的是，尽管非常低频具有优势，但它也存在一些限制。可用于非常低频传输的带宽相对较窄，这意味着数据传输速率低于更高频段。这一限制使其不太适合需要高速数据传输的应用，例如现代互联网通信。此外，传输非常低频信号所需的大型天线对某些用户来说可能不切实际。这些天线需要比用于更高频率的天线大得多，这在安装和维护方面可能会带来挑战。尽管存在这些缺点，非常低频的独特特性使其在特定背景下成为无价之宝。总之，非常低频的概念涵盖了一系列在军事通信、导航和科学研究等多个领域扮演着重要角色的无线电频率。尽管它存在局限性，但非常低频信号能够长距离传播并穿透障碍物的能力确保了它在当今技术环境中的相关性。随着我们继续加深对无线电频率的理解，非常低频的重要性可能会持续存在，并适应未来通信和导航创新的需求。