Recently, frequency-hop communication has been widely used in many military wireless communication domain as a secure transmission mode.
近年来，跳频通信技术作为一种抗干扰、抗截获、抗检测的安全传输方式已广泛应用在各种军事无线通信领域。
Autocorrelation of frequency-fixed signals always greatly interferes the performance of the detection of frequency-hopping signals based on multi-hop autocorrelation theory.
定频干扰信号的自相关特性严重影响了基于多跳自相关方法的跳频信号检测性能。
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。
Uses packet switching protocol based on frequency hop scheme with 1600 hops/s to enable high performance in noisy radio environments .
在无线电噪声环境里，利用基于每秒1600跳跳频表的分组交换协议可以提高系统性能。
To determine how strong the alpha constant was in any given spot, the scientists measured the frequency at which electrons in various atoms would hop from one energy level to the next.
为了确定在任一给出的位置的alpha常数的强度，科学家们测量了不同原子的电子从一个能级跃迁到另一能级的频率。
When the frequency hop rate is more than tens of thousands, the design of frequency synthesizer is more complicated.
当跳频的速率达到每秒数以万计时，频率合成器的设计将要复杂得多。
For example, the codes of class 2 are the best full frequency hop codes up to now.
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。
It is complicated to compute ambiguity function of frequency hop code signal and difficult to draw the ambiguity figure.
跳频编码脉冲雷达信号模糊函数的计算十分复杂，模糊图绘制非常困难。
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。
Fast frequency hopping system is the system whose hop rate is above one thousand per second.
快跳频系统指每秒频率跳变在一千次以上的跳频系统。
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。
The frequency hop code pulse signal is a new form of pulse compression radar signal, and is of great analysis value.
跳频编码脉冲信号是一种新的脉冲压缩雷达信号形式，极具研究价值。
The frequency planning for a cellular system enhanced with two-hop fixed relay nodes (FRNs) is investigated.
研究了两跳固定中继蜂窝网的频率规划问题。
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。
The network lifetime optimization issue is investigated for bidirectional two-hop cooperative Orthogonal Frequency Division Multiplexing (OFDM) systems recruiting multiple relays.
该文研究双向两跳协作多中继正交频分复用(OFDM)系统的网络寿命优化问题。
The network lifetime optimization issue is investigated for bidirectional two-hop cooperative Orthogonal Frequency Division Multiplexing (OFDM) systems recruiting multiple relays.
该文研究双向两跳协作多中继正交频分复用(OFDM)系统的网络寿命优化问题。
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