| 1. | Research and design of pn code sequence fast frequency hopping frequency synthesizer
伪随机序列快速跳频频率合成器的研制 |
| 2. | The project fulfills two of very important funcitons in a fh communication system - the generation of pn code and the synthesizing of hopping frequencies , and unites them together efficiently
该方案完成了跳频通信系统中极为重要的两个功能：伪随机码的产生和跳变频率的合成，并将它们有机地结合在一起。 |
| 3. | The experiment is used to show the theory of frequency hopping communication , the methods of reconnaissance and jamming for hopping frequency communication and the difference in all kinds of jamming methods
该实验的目的是为了具体展示跳频通信的工作原理,跳频通信的侦察与干扰方法以及跳频通信各种干扰方法的性能比较。 |
| 4. | At last , some low phase noise pll designs are to be presented by me to verify the theroies of low phase noise design . all in a word , this article provide some meaningfull instruction for low phase noise hopping frequency pll design
在本文的最后给出了几个低噪声锁相跳频源的设计实例，对低噪声锁相跳频源设计理论进行验证，且取得了很高的相噪指标，具有一定的指导意义和参考价值。 |
| 5. | The paper gives a kind of fft channelizing scheme used in the item , by analyzing different methods of reconnaissance and jamming for hopping frequency communication . and the paper gives a kind of design of frequency synthesis system on the basis of fpga and dds technology , and fpga is used to control the dds chip to produce different jamming signal
文章通过对目前各国正在研究使用的几种跳频通信侦察方案以及通信对抗中所用的各类干扰方式的介绍与分析比较,提出了一种在本实验系统中应用的fft -信道化侦察测频方案,并在此基础上设计了一种基于fpga和dds技术的频率合成模块,采用fpga控制dds芯片产生各种干扰信号。 |
| 6. | To assure that the hybrid ds - fh spread - spectrum communication mode has better capability of information safety and inference suppression , i bring forward a design scheme of ds - fh spread - spectrum communication system and solving effectively the crucial problem such as how to choose the user address , how to choose the hopping frequency and how to avoid the collision of the frequency which is used by different users at the same time
为保证系统可靠、有效地工作，本文提出了一种ds - fh混合扩频系统的设计方案，并且有效地解决了系统的用户选址、频率选择和频率碰撞等关键问题。通过系统设计仿真证实了ds - fh混合扩频系统具有优于ds系统的抗干扰性能，并在一定程度上提高了系统的抗远近效应能力。 |
| 7. | First , the overall design of frequency hopping frequency synthesizer ( fhfs ) is given . the characteristics of this approach are discussed and the corresponding key technologies are also briefly introduced . then , the specific frequency properties of dds output signals and their effect on fh signals are carefully analyzed
论文首先介绍了跳频频率合成器的整体设计方案，分析了这种方案的特点，并对其中的关键技术进行了简要的阐述；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。 |
| 8. | This paper mainly introduce the teconology of design modern microwave hopping frequency pll synthesizer with low phase noise . on the foundation of analysis of phase noise performance of pll circuit , i made some reasearch in system shcemes and methods for low phase noise design of microwave hopping frequency pll . some innovative ideas of low phase noise design about pll is presented in this paper
本文主要研究现代微波锁相跳频源低相噪设计技术。在对锁相环噪声性能分析的基础上，对现代微波锁相跳频源多种低相位噪声设计方案进行分析研究。提出了低噪声锁相跳频源设计的一些独道见解。 |
