高精度双向时间频率比对技术与实现研究

发布时间：2018-06-12 05:41

本文选题：双向时间比对技术 + 相位噪声　；参考：《电子科技大学》2017年硕士论文

【摘要】：随着科学技术的飞速发展,全球化通信也变得越来越发达,常常需要在遥远的两地之间建立统一的时间频率标准,所以为了实现时间频率统一的技术手段也日益发展。特别是近年来,随着通信技术的飞跃发展,在测控系统、雷达系统、导航系统等多个领域中,对统一时间的精度要求越来越高。目前高精度时间频率的同步方法主要有GPS卫星共视法和卫星双向时间频率法两种。共视法借助卫星导航系统实现时频同步,但由于导航信号弱易受外界各种干扰影响,因此精度有限且实时性也较差;时间频率双向比对方式主要是利用专用卫通设备,通过同步卫星透明转发器互相通信实现,精度高、实时性好,具有一定的抗干扰能力。由于卫星双向时间频率比对法的技术优越性,目前国际电信联盟已将其作为时间比对及统一的主要手段。随着GPS技术的成熟利用,人们通常利用GPS卫星共视法来实现远距离的时间统一,但是GPS共视法很难达到几纳秒级的授时精度。为了进一步提高授时精度,近几年来卫星双向时间频率比对法逐步走入人们的视野,并广泛的应用于测控系统、雷达系统、导航系统等多个领域中。怎样提高卫星双向时间频率比对法的授时精度、抗干扰能力成为了科研人员研究讨论的重要话题。本论文首先介绍了双向时间频率比对技术的概念,接下来对其工作原理进行了阐述,并对其工作流程进行了详细的介绍,说明了系统结构与体制设计。接着深入分析了双向时间频率比对设备组成和工作原理,对组成模块进行了详细的功能描述,并对涉及到的关键技术进行了阐述。最后利用两套卫星双向时间频率比对设备进行了中频指标测试以及射频指标测试。从测试结果可以得出,中频授时精度能够小于3ns,射频授时精度能够小于10ns。相比较GPS卫星共视法而言,双向时间频率比对技术的优势较为明显,应用前景非常广泛。
[Abstract]:With the rapid development of science and technology, global communication has become more and more developed. It is often necessary to establish a unified standard of time and frequency between distant places. Therefore, in order to realize the unification of time and frequency, the technical means are also increasingly developed. Especially in recent years, with the rapid development of communication technology, in many fields, such as measurement and control system, radar system, navigation system and so on, the accuracy of unified time is becoming more and more high. At present, there are two kinds of synchronization methods of high precision time frequency: GPS satellite common view method and satellite bidirectional time frequency method. The method of common view realizes time-frequency synchronization with satellite navigation system, but because navigation signal is weak and easily affected by various kinds of external interference, the accuracy is limited and the real-time performance is also poor. The method of two-way comparison of time and frequency is mainly by using special satellite communication equipment. By using the transparent transponder of synchronous satellite to communicate with each other, the accuracy is high, the real time is good, and the anti-jamming ability is certain. Because of the technical superiority of the bidirectional time-frequency comparison method, the International Telecommunication Union has taken it as the main means of time comparison and unification. With the mature use of GPS technology, people usually use GPS satellite common view method to realize long distance time unification, but GPS common view method is difficult to achieve several nanosecond precision. In order to further improve the accuracy of time service, in recent years, satellite bidirectional time-frequency comparison method has gradually come into people's view, and has been widely used in many fields, such as measurement and control system, radar system, navigation system and so on. How to improve the accuracy and anti-jamming ability of satellite bidirectional time-frequency comparison method has become an important topic for researchers to discuss. This paper first introduces the concept of bidirectional time-frequency comparison technology, then expounds its working principle, and introduces its working flow in detail, and explains the system structure and system design. Then, the composition and working principle of the bidirectional time-frequency ratio equipment are analyzed in depth, the function of the component module is described in detail, and the key technologies involved are described. Finally, two sets of satellite bidirectional time and frequency comparison equipment are used to test if index and RF index. From the test results, it can be concluded that the intermediate frequency timing accuracy can be less than 3ns, and the RF timing accuracy can be less than 10ns. Compared with GPS satellite common view method, bidirectional time and frequency comparison technology has obvious advantages and has a wide application prospect.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P228.4

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