Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.
由于月球阻碍了与探测器的直接无线电通信，中国首先必须把一颗人造卫星送入月球轨道上的一个点，人造卫星可以从那里向航天器和地球发射信号。
However, this purely visual system was useless in bad weather, and, by the 1930s, radio communication was coming into use for ATC.
然而，这种纯粹的视觉系统在恶劣天气下毫无用处，到了20世纪30年代，无线电通信开始用于空中交通管制。
In the 1940s, ATC centres could and did take advantage of the newly developed radar and improved radio communication brought about by the Second World War, but the system remained rudimentary.
在20世纪40年代，空中交通管制中心能够而且确实利用了第二次世界大战中新研制的雷达和改进的无线电通讯，但是这个系统还处于初级阶段。
Accessories like helmet lamps and radio communication.
附件有钢盔灯和无线电通信器。
They underwent courses in radio communication, demolition, and sabotage.
他们接受了无线电通信、拆毁和破坏的课程。
Single-side band (SSB)transceiver plays an important role in radio communication.
单边带电台在无线通讯方面起着重要的作用。
Gain control circuit, receiver and transmitter, radio communication device and system.
增益控制电路，接收器和发送器，无线通信装置和系统。
Wireless radio communication, relay communication and satellite communication is adopted mainly.
主要是无线电台通信、接力通信和卫星通信。
Beyond photography, the birds also carried messages at times when radio communication was spotty or down.
除了摄影之外，在无线电不够灵光的时候，鸽子也可以被用来传递情报。
These phenomena are supposed to be of great importance as they may affect weather and radio communication.
人们认为这些现象很重要，因为这些现象会影响气候和无线电通讯。
In 1998, ETSI publicized TETRA protocal, which is a standard of digital trunked radio communication system.
TETRA协议是欧洲电信标准协会(etsi) 1998年公布的一种数字集群通信系统标准。
It is widely used in the electronic warfare system, radar beacon radio communication and monitor system etc.
它广泛适用于电子战系统、雷达信标、无线电通信以及监测等领域。
This method is applied to classify and identify the radio communication signals and has acquired good results.
文章将这种方法用于无线电通信信号的分类与识别，取得良好的效果。
But the Eiffel Tower was built before radio communication was necessary, and even before the radio was invented.
但是艾菲尔铁塔建造于无线通讯为大众所需之前，甚至早于无线电的问世。
In order to realize subway mobile communication signal coverage, specialized radio communication system was established.
为了实现地铁移动通信信号的覆盖，建立了专用无线通信系统。
This paper proposes a design principle and realization method of the baseband DQPSK modem in radio communication system.
提出了一种无线通信中基带调制解调器的设计原理和实现方法。
The area spectral efficiency of fully loaded cellular radio communication systems with variable-rate transmission is investigated.
研究采用可变速率传输的满负荷蜂窝无线通信系统的面积频谱效率。
The practical reason for understanding the electrical nature of ash plumes is that they can interfere with aircraft radio communication.
进行此类研究的实际原因在于火山灰带电性将对飞机无线电通讯造成干扰。
The JN1105A is a mobile communication countermeasures system designed to locate and jam enemy tactical radio communication signals.
JN1105A是一种机动通信干扰系统，设计去定位和阻塞敌人战术无线电通信。
Microwave communication tower, the common structure for radio communication, requires complicated design, calculation and plotting.
微波通信铁塔是微波通信系统中最常用的构筑物，其设计、计算及绘图较复杂。
One of the most critical points in optical PPM radio communication lies on the recovery of slot clock and frame synchronization signal.
P PM无线光通信的关键问题之一在于时隙时钟与帧同步信号的恢复。
The radio communication module is particularly discussed, and the application example of TC35 in CO gas density monitor is also introduced.
对无线通讯模块TC35进行了详细介绍，并给出TC35短消息收发模块在CO气体监测仪中的应用。
Nowadays, the software radio has become a technique hot spot in the radio com-munication field, especially in the military radio communication field.
目前，软件无线电技术已成为无线电通信领域，特别是军用无线电通信领域的技术热点。
Recent years, with the rapid development of communication, the research of digital trunked radio communication system becomes more and more important.
近年来，随着通信的飞速发展，作为专用移动通信系统的数字集群通信系统的研究也变得越来越重要了。
The ionosphere gets its name because it's teeming with ions and though it's very thin, it reflects radio waves, which is how radio communication works.
电离层得名，因为它是充满离子，尽管它非常薄，它反映了无线电波，它是如何无线电通信工程。
The statistic model of air-ground radio communication channel is characterized by the multipath fading, Doppler power spectrum and delay power spectrum.
空地通信信道的主要统计特性包括多径衰落特性、多普勒功率谱和时延功率谱。
Medium frequencies and horizontal magnetic dipoles (vertical loop antennas) can be used in underground radio communication in mining sections of coal mines.
中频频率和水平磁偶极子天线(垂直环状天线)是井下采区无线通信可使用的频段和天线型式。
Medium frequencies and horizontal magnetic dipoles (vertical loop antennas) can be used in underground radio communication in mining sections of coal mines.
中频频率和水平磁偶极子天线(垂直环状天线)是井下采区无线通信可使用的频段和天线型式。
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