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。
Hopping frequency (FH) communication technology is the important part of spread spectrum communication, which is widely applied in anti-jamming communication.
跳频技术是扩频通信中的一种抗干扰的实用技术。
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。
DSSS system combats the jamming by reducing the effective power of jamming, and FH system does through the frequency hopping to avoid jamming.
直接序列扩频通过扩展干扰频谱降低有效干扰功率进行抗干扰，跳频则主要是通过频点跳变的方式躲避干扰。
Meanwhile, synchronization is also the difficulty of the development of FH system, which needs supplicated design especially in the fast frequency hopping (FFH).
同时跳频同步也是跳频通信系统开发的难点，特别在高跳速工作时实现同步捕获和跟踪需要精心设计方案。
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。
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。
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。
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。
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。
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。
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。
For fast and accurate design and production of lumped constant bandwidth frequency-hopping(FH) narrowband filter, a load structure changing with frequency is introduced.
为了快速准确地设计并制作恒带宽窄带集总跳频滤波器，提出了一种随频率变化而 变化的负载结构。
In the spread spectrum communication, direct sequence spread spectrum (DSSS) and frequency hopping (FH) are the two kinds of most widely used spread spectrum technologies.
在扩频通信技术中，直接序列扩频和跳频是应用最广的两种扩频技术。
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。
The advantages of strong anti-interference, random address selection make shortwave frequency-hopping (FH) communication have a wide application in the areas of military.
短波跳频通信具有较强的抗干扰能力和任意选址等优点而在军事通信领域得到了广泛的应用。
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。
Synchronization is one of the key techniques to frequency-hopping (FH) communication system.
同步是跳频通信系统关键技术之一。
Over the past few decades, frequency-hopping (FH) communication system is widely used in military applications for its well performance.
跳频通信是扩频通信的一个分支，它的突出优点是抗干扰性强，因而很适用于军事领域。
Finally, the OFDM modulation system and frequency-hopping system are connected by Schematic to constitute FH-OFDM modulation system.
最后用原理图输入方式把OFDM调制系统和跳频系统两个子系统相连构成FH - OF DM混合调制系统。
Frequency Hopping (FH) has becoming an important means of naval communications.
跳频通信在舰艇通信中占有重要的地位。
Aiming at the actual application of communication countermeasure, a new method about accurately estimating the hop duration was proposed for the Frequency-Hopping (FH) signals.
针对通信对抗的实际应用，提出了一种精确估计跳频信号跳周期的新方法。
The results show that:the direct sequence spread spectrum signals, frequency hopping signals and DS/FH hybrid spread spectrum signals are correct;
实验结果表明：产生的直扩信号、跳频信号和DS／FH混合扩频信号正确；
The results show that:the direct sequence spread spectrum signals, frequency hopping signals and DS/FH hybrid spread spectrum signals are correct;
实验结果表明：产生的直扩信号、跳频信号和DS／FH混合扩频信号正确；
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