In modern shortwave communication , the length of signal existence time in single channel is very short for reducing the probability of being intercepted , thus the difficulty of signal detection and extraction increased 摘要在现代短波通信中，作为低截获率通信手段之一，单个信道内信号持续时间大大缩短，从而增加了信号检测与提取的难度。
Since some equipments used in the system are not always full duplex , we developed a novel link control protocol - dynamic sliding window protocol , which is adaptive to both of the half - duplex and full - duplex communications 针对短波通信系统中可能存在半双工的通信设备，我们开发了半双工与双工信道均适用的差错控制协议? ?动态滑动窗口协议。
As a important method for middle or long distance wireless communication , short - wave communication gains its recognition over again , for its long - distance and anti - destroy capability . but now more advance performances are expected 短波通信是中远距离无线通信的一个重要方式，由于通信距离远、抗打击能力强、设备简单等优点在近年来重新受到重视。
Short wave is used for wireless communication which the wavelength is from 10m - 100m . in fact , the high frequency part of medium wave usually belongs to short - wave band . so many short wave communication equipments ’ band was extended to 1 . 5 - 20mhz 实际上,许多人也把中波的高频段( 1 . 5 - 3mhz )归到短波波段去,所以现有的许多短波通信设备,其波段往往扩展到1 . 5 - 20mhz 。
The physical simulation of shortwave channel enables researchers to simulate particular channel environment in the lab , which is beneficial to the research and test of shortwave communication system . thus it has marvelous value of application 短波信道的物理仿真,使人们可以在实验室里仿真特定的信道环境,从而有助于短波通信系统的研究和测试,具有重要的应用价值。
Short - wave communication has been applied to the field of government , military affairs , diplomacy , weather , business and so on for many years . it used for transmittiing audio , words , video , data and other information 短波通信多年来被广泛应用于政府,军事,外交,气象,商业等领域,用以传送语音,文字,图像,数据等信息,尤其在军事部门,它始终是军事指挥的重要手段之一。
The study of this paper was derived from military project . in this paper , we focused on the research on the third generation hf automatic link establishment technologies . the third generation hf radio network is defined by the standard of mtl std 188 141b 本论文来自军方预研项目，主要研究第三代短波通信网络标准（美军标mtl std 188 141b ）中的链路自动建立( ale )技术。
The national wireless management committee established the national wireless short - wave monitors network system project . initial stage in this project , it adopts the short wave and the argus monitors system that research to manufacture monitors to harmonious work 针对无线电通信中的短波管理，国家无线电管理委员会设立了国家无线电短波监测网络系统项目，通过这样的监测网络，达到对短波通信的有效管理。
Chapter 1 introduces the extensive application of hf / vhf communication and hf / vhf radios in military field , and points out the significance for promoting the research work of fh communication countermeasure using modern signal processing techniques , especially time - frequency analysis 第一章介绍了短波通信和短波跳频电台在军事领域中的广泛应用，以及现代信号处理技术特别是时频分析技术对促进跳频通信对抗研究的重要意义。
Ale system military standards include a highly robust signaling system , a extendable protocol system , multiple address modes , multiple rtce ( real - time channel estimation ) modes and open system structure , in order to offer advanced hf communication network function Ale系统军用标准包括一个高度稳健的信令系统、可扩展的协议系统、多种寻址方式、多种rtce ( real - timechannelestimation )模式以及开放的结构，以支持高级的短波通信网络功能。
