The principle of FH communication is described.
简述了跳频通信的基本原理。
Barrage jamming or track jamming can be used to the FH target.
对于采用了跳频技术的目标，可以采用阻塞式干扰或跟踪式干扰。
The design of FH multiple-access code adapting for multi-network is put forward.
提出了较适合于多网通信的跳频地址码的设计方法。
There are several difficult problems in the research of spread spectrum FH/DS system.
在研制扩展频谱FH/DS系统时，会遇到一些很困难的问题。
Differential frequency hopping (DFH) is a kind of new frequency hopping (FH) technique.
差分跳频是一种新型的跳频通信技术。
The end of the list is indicated by a feed document that does not contain an fh: prev element.
列表的末尾由一个不包含fh：prev元素的feed文档来指示。
To compare the cytotoxicity of imported polyacrylamide hydrogel (it) with that of home made (FH).
比较国产聚丙烯酰胺水凝胶(FH)与进口聚丙烯酰胺水凝胶(it)的细胞毒性。
FH composite fire retardant for PP tufting carpet using in back-coating latex have been presented.
研究开发了FH复合阻燃剂，用于背衬胶乳阻燃法阻燃丙纶簇绒地毯。
Actual test shows this receiver is able to accomplish the task of automatic reception of FH signals.
经实际测试，该接收机能完成跳频信号自动接收的任务。
The BER formula is derived when a DS spread spectrum signal bandwidth is equal to the FH slot spacing.
推导了在直接序列扩频信号带宽等于跳频频隙间隔时系统的误码率公式。
For example, 802.11 and 802.11-fh products are not interoperable with 802.11-ds products, and vice versa.
例如，802.11和802.11- FH产品不能与802.11 -DS产品协同工作，反之亦然。
Networking is the key for the frequency hopping (FH) communications to be working properly in the FH system.
在跳频通信系统中，组网是关系到跳频通信能否正常建立的关键。
In order to use the military FH radios correctly we must study the factors of affecting the military FH radios.
军事上为了正确应用跳频电台，必须对影响跳频电台正常通信的因素进行研究。
Frequency-selective frequency hopping(FH) cosite d interference is a typical long impulse response interference.
跳频同址干扰具有频率选择性，是典型的长脉冲响应干扰。
By the analysts of state space, nonlinear transfer function is employed to improve the performance of FH sequence.
通过分析输出序列的状态空间，提出了一种改进的非线性转移函数来改善跳频序列的性能。
It is significant for us to exert the battle efficiency and improve the battle effectiveness of military FH radios.
对于发挥军事跳频电台的战斗效能、提高其战斗力具有重要意义。
By the analysis of state space, nonlinear transfer function was employed to improve the performance of FH sequence.
通过分析输出序列的状态空间，提出了一种改进的非线性转移函数来改善跳频序列的性能。
Then, the specific frequency properties of DDS output signals and their effect on FH signals are carefully analyzed.
接着，分析了DDS输出信号的频谱特性以及这些特性对跳频信号的影响。
In this paper, a finite precision chaotic FH sequence generator is designed based on the structure of digital filters.
本文采用有限精度非线性数字滤波器结构设计混沌跳频序列发生器。
It is importance for us to exert the battle efficiency and improve the battle effectiveness of FH communication systems.
对正确应用跳频通信系统和提高其战斗效能具有重要意义。
The models implement all functions of the FH radio, and describe the actions of frequency-hopping communication exactly.
模型实现了跳频电台的各项功能，准确描述了该跳频无线通信网络的通信行为。
The combination of the fh: incremental and fh: prev elements solves the problem of reconstructing the full history of a feed.
incremental和fh：prev元素的结合解决了feed的完整历史的重建问题。
FH synchronization is set up using the method of combining synchronization head with time of day (TOD), FH building-net using TDMA.
采用同步字头和时间信息TOD相结合的方法实现跳频同步，采用时分多址(TDMA)方式进行跳频组网。
As is known it is difficult to design good FH code and synchronize the transmitter and receiver in a chaotic FH communication system.
众所周知，设计好的跳频码和在混沌跳频通信系统中实现收发双方的同步是很困难的。
Firstly, the definitions of absolute and relative key amounts of FH systems, equal-interval and unequal-interval FH systems are given.
首先给出了跳频系统的绝对密钥量和相对密钥量、等间隔和非等间隔跳频系统等定义；
Aiming at the characters of conventional FH radios, a whole scheme to realize the arithmetic of the adaptive random shift FH is put forward.
接着针对当前跳频电台的特性，提出了自适应随机变速跳频算法实现的总体方案。
Production practice indicated that the FH-5 catalyst has good adaptability, stability as well as a certain activity in low pressure hydrofining.
生产实践表明：FH - 5催化剂具有较好的适应性、稳定性及一定的低压加氢精制活性。
The FH (Frequency Hopping) communication technology is the most important part of anti jamming communication. FH pattern is the key in FH system.
跳频通信技术是一种重要的抗干扰通信技术，跳频图案的设计是跳频通信中的一项关键技术。
As the Beidou satellite navigation system, it is possible to use the time service as the source of synchronization referrence in Tactics FH radio.
随着北斗卫星导航系统的正式运营，利用北斗无源授时服务提供的时钟作为战术跳频电台的同步参考时钟成为了可能。
As the Beidou satellite navigation system, it is possible to use the time service as the source of synchronization referrence in Tactics FH radio.
随着北斗卫星导航系统的正式运营，利用北斗无源授时服务提供的时钟作为战术跳频电台的同步参考时钟成为了可能。
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