例如文中第2类码是目前已知的各方面综合性能最好的全频道跳频码。
For example, the codes of class 2 are the best full frequency hop codes up to now.
深入研究了实际侦收到的跳频码的混沌特性，提出了跳频码的混沌模型。
Fifthly, we lucubrate the chaotic characteristic of the real hopping frequency codes and propose the chaotic model of hopping frequency codes.
这对从理论上认识跳频通信和捷变频雷达跳频码的本质，具有重要的理论意义。
It has important significance to recognizing HF communication and frequency agile radar on theory and essence.
提出跳频码序列的两种构造方法，并讨论跳频参数，最后分析了跳频干扰效果。
Two new practical construction methods of families of frequency sequences are presented, and parameters of FH are discussed. Finally, the effect of the FH jamming model is analyzed.
与已有的方法相比，产生的跳频码具有良好的性能，且抗预测和破译的能力较强。
The obtained codes have better performance compared to the conventional ones and are immune to prediction and interception.
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。
As is known it is difficult to design good FH code and synchronize the transmitter and receiver in a chaotic FH communication system.
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。
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.
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。
In order to enhance the nonlinearity and period length, different chaotic maps are combined into a cascaded chaotic map to design FH codes.
基于混沌跳频码序列构造固有的确定性、非线性等特点，提出了对抗混沌跳频通信的非线性自适应预测对抗的新概念。
Based on the deterministic characterization of chaotic FH code construction and nonlinear dynamics of chaotic FH code, nonlinear adaptive predictive countermeasure method is proposed to interfere.
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。
In this thesis, a new quasi-synchronous multiple access scheme suitable for FH communication system employing NHZ hopping code is proposed.
提出了较适合于多网通信的跳频地址码的设计方法。
The design of FH multiple-access code adapting for multi-network is put forward.
通过对改进素数码的不同脉冲位置赋予不同的频率，提出了一种新的跳频扩时码。
A novel frequency time spreading code by designating the different frequencies to the different mark positions of the modified prime code is proposed.
最优PCDP可以直接用来构造最优跳频序列和无逗点码。
Such PCDPs can be used directly to produce optimal frequency hopping sequences and comma free codes.
跳频方案采用软件无线电技术，采用DSP作为伪码发生器，控制DDS输出频率，得到相应的跳频图案。
The frequency hopping system based on software radio, DSP is used to generate quasi-stochastic sequence and control the output frequency of DDS to construct required hopping maps.
本文分析了跟踪干扰对跳频系统中码跟踪环性能的影响。
In this paper, the effects of a follower jamming on the performance of a delay-lock code tracking loop in a frequency hopping system are analysed.
采用RS码作为构造跳频图案的伪随机序列，分析讨论了RS序列的产生方法。
The RS sequences have been chosen as a pseudo-random frequency hopping sequence, and the RS sequence production method has been introduced.
采用短码携带同步信息，克服了快速跳频难以携带相关码的困难。
The synchronization information is carried by short code, which overcomes the difficulty of correlation code transmission in fast frequency-hopping.
利用快速四阶循环累积量算法、时频脊线分析与小波变换相结合的方法，实现了跳频频率和码速率等参数的高精度估计。
They are used to yield accurate estimation for the hop frequencies and hop rate, which are fast 4th-order cyclic cumulants algorithm, time-frequency backbone curve analysis, and wavelet transform.
利用快速四阶循环累积量算法、时频脊线分析与小波变换相结合的方法，实现了跳频频率和码速率等参数的高精度估计。
They are used to yield accurate estimation for the hop frequencies and hop rate, which are fast 4th-order cyclic cumulants algorithm, time-frequency backbone curve analysis, and wavelet transform.
应用推荐