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。
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。
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。
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。
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。
In order to enhance the nonlinearity and period length, different chaotic maps are combined into a cascaded chaotic map to design FH codes.
为了增大混沌跳频码的周期和非线性复杂度，我们利用多个不同混沌映射组成一个级联混沌映射，并用来设计跳频码。
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。
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。
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。
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。
Due to the obvious impact of frequency offset on PN sequences, based on the FH sequence, a symbol synchronization scheme with a conjugate symmetric training sequence is proposed.
针对频偏对PN序列相关性影响比较明显的问题，提出了一种利用FH序列构造的具有共轭对称性质的训练序列进行符号同步的方案。
The No-Hit-Zone (NHZ) hopping code is employed by the frequency hopper of NHZ FH communication systems, which have no hits at all within a predefined correlation zone in the vicinity of zero shift.
无碰撞区跳频通信系统的跳频器所使用的跳频码是无碰撞区跳频码，该码在零位移附近一段区域内汉明相关值为零。
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。
Computer simulating results have shown that it is a good method to track and to analyze FH SS signal by using STFT if a proper window function with proper parameter is selected.
计算机模拟结果表明，选择合适的窗口函数类型和窗口参数，利用STFT进行跳频信号的跟踪、分析，可取得较好的效果。
Based on the requests of synchronization for a high-speed FH communication system, we achieved synchronization by using a method combined synchronization-head with time of day (TOD).
针对高速跳频通信系统中同步的要求，采用同步头与时间信息相结合的方法实现跳频同步。
A method of controlled frequency points is put forward, which can destroy FH signal sorting. So the running-after-sport jamming will not be effective.
提出一种跳频电台通过抑制跳频频率点、破坏干扰站网台分选的方法，从而达到对抗跳频跟踪式干扰的目的。
This subject comes from a military development project - Digital VHF FH Radio Set, and it is mainly used for the data communication between navy vessels.
本课题来自军事开发项目——数字化超短波跳频电台，主要用于海军舰艇之间的数据通信。
Therefore, it has a practical significance to develop some fit methods of modulation with high spectrum efficiency for shortwave FH communication system.
因而，研究适合于高速数据传输的跳频通信特点且具有高效频谱利用率的调制技术具有重要的实际意义。
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。
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。
A timing and frequency synchronization scheme based on FH sequence is proposed for the free space optical communication Orthogonal frequency Division Multiplexing (FSO-OFDM).
提出了一种基于FH序列的自由空间光通信多载波调制(FSO - OFDM)时间频率同步方案。
A novel adaptive line enhancer (ALE) with high frequency resolution was presented, which suitable for underwater acoustic communication with MFSK or frequency hopping (FH) modulation.
根据水声mfsk或跳频通信中频率估计特点，提出了一种基于自适应线谱增强器(ale)理论的实用高分辨频率估计新方法。
A sliding window algorithm was developed for speech communications on Frequency-Hopping (FH) channels with wideband rejective interference.
为满足在跳频信道上的语音传输需求，研究了一种抗阻塞干扰的“滑动窗”语音传输算法。
A series of control tests such as inner consistency test, threshold value test, FH test, time window moving test, etc. show that the application result of the method is stable.
内符合检验、阈值试验、FH检验、时间窗移动试验等一系列控制试验表明识别结果较稳定。
And this will establish a foundation for the applications of the military FH radio networking. Networking is a basic demand of modern military communications.
组网应用是现代军事通信的基本要求之一，利用软件无线电实现跳频电台组网是通信组网的一个发展趋势。
In this thesis, a new quasi-synchronous multiple access scheme suitable for FH communication system employing NHZ hopping code is proposed.
为了利用无碰撞区跳频码的特点，论文提出了一种适用于基于无碰撞区跳频码跳频通信系统的多址接入准同步组网方案。
To aim at the actual application of electronic countermeasures, a method for the hop rate accurate estimation is proposed for the frequency hopping (FH) signals.
针对电子对抗的实际应用，提出了一种精确估计跳频信号跳速的方法。
To aim at the actual application of electronic countermeasures, a method for the hop rate accurate estimation is proposed for the frequency hopping (FH) signals.
针对电子对抗的实际应用，提出了一种精确估计跳频信号跳速的方法。
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