An fh: incremental element with a value of false (like that in Listing 2) indicates that the feed document in question is a complete representation of the feed's contents.
一个具有值false的fh：incremental元素(如清单2中所示)指出，所讨论的feed文档是feed内容的完整表示。
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。
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。
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。
The principle of FH communication is described.
简述了跳频通信的基本原理。
Based on the characteristics of the TOD FH synchronous technique, which works by means of identifying, separating and jamming FH synchronous signals.
基于这些特点用干扰同步信号的方式来对跳频同步信号实施同步瞄准式干扰。
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。
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。
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。
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。
It is crucial to study the features of the frequency hopping signals in both time and frequency domain in order to detect and trace the FH signals.
对跳频信号的时频域进行分析是研究跳频通信，实现识别、跟踪跳频信号的重要基础。
So researching the surveillance, interception and classification methods for FH signals has been a difficult and pressing task in communication countermeasure fields.
开展对跳频通信对抗的研究，寻求截获，分选识别跳频通信信号方法，已成了当前通信对抗领域紧迫而困难的任务之一。
Therefore, based on researching FH communication systems, the influence of part time-resident interference on FH communications synchronization and its tracking has been mainly analyzed.
为此，在对跳频通信系统研究基础上，重点分析了部分驻留时间干扰对跳频通信系统同步及跟踪的影响。
Finally, simulation models of FH transmitter, receiver and jammer are presented. The influence of frequency excursion on performance of multi-tone continuous wave jamming is analyzed.
最后给出了跳频通信发信机、接收机以及干扰机成员的仿真模型，分析了频率偏移对多频连续波干扰性能的影响。
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。
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。
Modern FH communication system need transmit a mass of data, traditional modulations are no longer suitable for high-speed data transmitting in FH system due to low spectrum efficiency.
现代跳频系统需要传输大量数据信息，传统调制方式由于频谱利用率低而不适合跳频系统的高速数据传输。
The paper introduces the composition and the operation mode of frequency hopping (FH) communication system and the design requirement of frequency hopping synthesizer.
介绍了跳频通信系统的基本组成、工作方式以及跳频通信系统中跳频综合器的设计要求。
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。
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。
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。
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。
New interference methods, such as sweeping frequency interference and faster-hop-collision interference, become a new focus of electronic countermeasures to FH communication systems.
扫频式干扰、更高跳速碰撞干扰等新的干扰方法成为跳频通信系统电子对抗领域中又一重要研究方向。
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；
Network of the shortwave FH radio is significant in the military communication, also the applications of network can improve the anti-jamming capability of the shortwave FH radio.
短波跳频电台组网在军事通信中占有重要地位，组网应用可以提高跳频电台的抗干扰性能。
This review summarizes recent studies on the molecular basis of FH-like phenotype heterogeneity in the hope of drawing more attention to the disease.
文章就有关FH样表型遗传异质性的分子基础研究的近况作一简要综述，以引起人们的关注。
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 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。
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。
A digital VHF FH communication system is introduced, followed by its timing, the format of the data transmitted, the synchronization method and the keeping of synchronization.
文中介绍了一种数字化超短波跳频通信系统，并着重讨论了其系统定时、发送数据格式、同步的实现方式、同步保持等关键技术。
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