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.
短波通信以电离层作为其主要的中继系统。
The ionosphere is used by the shortwave communication as the relay station for the electromagnetic paths.
南极北京是我国目前最长的短波通信线路之一。
The shortwave radiocommunication between Antarctica and Beij- ing is the longest link at present time in China.
分析短波通信的特点，了解单边带调制的相关特性；
Present the SSB modulation and some characters of HF communication.
短波接收机的数字化是当前短波通信研究的一个重点。
The digitalization of a HF receiver is an important spot in the current communications research field.
短波通信是军事通信领域中一种重要的无线通信技术。
Short-wave communication is an important wireless communications technology in the field of military communications.
本文还对应用于短波通信系统的协议进行了研究和实现。
The software design and implement of the protocol which used in shortwave telecommunication system is also discussed in this paper.
在短波通信中，极低信噪比条件通信是一种应急通信手段。
In high frequency communication, extremely low SNR communication is an expedient means.
针对超短波通信，提出WDTP协议，可减小数据通信误码率。
To reduce the errors of digital communication, the WDTP (Wireless Data Transmission Proof) agreement was proposed for ultrashort wave communication.
提出一种利用非单点模糊系统建模的短波通信频率参数预测模型。
This paper presents a prediction model of frequency parameters of short-wave communication based on non-singleton fuzzy system.
短波通信在某些场合是不可替代的，其安全问题一直为人们所关注。
The shortwave communications is indispensability required in certain field and situation, and its security has always been a widespread concern.
本文所研究内容的课题来源于某专用超短波通信设备转信系统的研究。
The subject in this thesis comes from the researching of some special ultra short wave communication device transmission system.
这些优点使短波通信成为军事部门及其它机构远距离通信和指挥的重要工具。
So, it is usually adopted as an important tool for long distance communication and command system by military department and other organizations.
短波通信由于其天波传播特性，在通信领域具有其它通信手段无法替代的地位。
High frequency (HF) communications play an important role in the field of their communications because of their skywave propagation characteristics.
提出对抗超短波通信的战术指标，在此基础之上，定量分析了各指标的确定方法。
The tactical index of Super short Wave communication is put forward, based on which, the measure of reckoning each index is analyzed.
静区的存在是短波通信的重要特征之一，克服静区，实现战术通信是研究的主题。
The existence of dead zone is one of the characteristics of shortwave communication. Conquer it and realization tactics communication is the research topic of this paper.
无线通讯通常存在不同形式的干扰，因此超短波通信受干扰也是不可避免的问题。
Wireless communication has different forms of interference, so ultrashort wave communication interference is an inevitable problem.
在短波通信系统中，由于多径效应常常引起信道衰落，直接结果是码间串扰非常严重。
In shortwave communication system, Intersymbol Interference is serious and signal is distorted extremely because of fading channel resulted in by the effect of multipath.
短波是人类最早开发利用的无线电频段，短波通信是历史最为悠久的现代通信手段之一。
Short wave is radio frequency band earliest utilized by human being, and short wave communication is one modern communication method with a long history.
该课题研究如何将不同种类的超短波通信设备用一个通用平台连接起来，实现互连互通。
The subject researches for how to connect different kind of ultra wave communication devices using a universal platform to realize connection and communication.
文章最后指出了该超短波通信系统通信控制器的不足之处以及今后可以努力改善的方向。
At last, the thesis has pointed out some deficiencies of this ultra short wave communication system communication controller and the ways to modify have been described also.
短波通信以其机动灵活、抗毁性强、通信距离远等特殊的优点重新引起人们的研究兴趣。
People show great interest in shortwave communication for its special merits such as flexibility, not easily be destroyed and long propagation distance.
介绍了超短波通信电台射频功放功率保护控制电路的功用和工作原理，并给出了原理电路。
This paper introduces the application and principle of RF power amplifier's safeguard and control circuit in ultra short communication radio. The principle circuit is given.
短波通信具有的机动灵活和通信距离远等特点，使得它在军事通信中具有十分重要的地位。
Due to the flexibility and the ability of long distance transmission, HF communication plays an important role in the fields of military communication.
我国第三代短波通信的研究刚刚起步，国内的短波通信系统大多基于第二代短波通信标准。
The domestic research on third generation HF communication came late and most of the HF radio stations are based on second generation.
短波通信具有成本低、架设灵活、抗毁能力强等优点，在远距离通信中起着举足轻重的作用。
Shortwave communication plays a vital role in long haul communications, on account of its unique merits such as low cost, convenience to be generated and strong resistance to damage.
跳频通信技术因其具有良好的抗干扰能力而被广泛应用于各类通信系统中，尤其是短波通信中。
Frequency hopping technology has served in all kinds of communication systems with its excellent interference resistance ability, especially in short wave communication system.
现代短波通信系统，其信道大多数具有频率的选择性，多径传输产生了信号的相干衰落与符号干扰。
In modern shortwave communication systems, the channels are mostly frequency-selective, multipath transmission causes the coherent attenuation and symbol interference.
提出在短波通信中利用发射端窄波束，在空间上将能量集中于主路径且抑制其他路径来改善多径信道环境；
The authors propose a method of using transmit narrow-beam to spatially concentrate the radiation energy on dominant path and suppress undesired paths in the shortwave communication.
提出在短波通信中利用发射端窄波束，在空间上将能量集中于主路径且抑制其他路径来改善多径信道环境；
The authors propose a method of using transmit narrow-beam to spatially concentrate the radiation energy on dominant path and suppress undesired paths in the shortwave communication.
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