双向卫星时间频率传递技术中若干参数测定与研究
发布时间：2018-07-31 07:04
【摘要】：时间服务是国家的基本技术支撑，高精度的时间传递和同步问题是时间服务的重要组成部分，同时也是国际原子时的稳定延续和现代科技发展的重要技术支撑。双向卫星时间频率传递技术(TWSTFT)已证明是准确度和稳定度都很好的时间传播手段，在短期时间内其稳定度测试结果与理论一致，现在正在进行长期稳定性的研究。 双向卫星时间频率传递技术中有很多可操作参数，其中射频频率和扩频码速率是最重要也最有可能影响到双向卫星时间频率传递稳定度和准确度的两个参数。为了研究该参数对双向卫星时间频率传递的影响程度，采用中国科学院国家授时中心的CAPS地面测轨网和中卫卫星等设备进行试验所得的试验数据，进行数据分析处理并得出结论。本文所做主要工作如下： 1.简单介绍了双向时间频率传递技术的发展情况和论文研究的背景及意义； 2.阐明了双向卫星时间频率传递技术的原理并对其误差进行了分析，给出了本次试验的两种方法——三站闭合法和零基线法，并介绍了其原理； 3.基于三站闭合法和零基线法对试验所得的关于不同射频频率的双向试验数据进行分析，得出结论：射频频率为6047M是双向卫星时间传递技术中比较理想的射频频率，但是两种射频频率的精度和准确度差异很小，在同一个量级，所以在实际的双向卫星时间频率比对中，可以考虑整体的性价比，再决定采用哪种射频频率； 4.基于三站闭合法和零基线法对试验所得的关于不同扩频码速率的双向试验数据进行分析，得出结论：在相同扩频码速率的条件下，精度基本保持一致，系统差也在同一水平；在不同扩频码速率的条件下，，精度值随着扩频码速率的增大而提高，不同扩频码速率对双向卫星时间频率传递的系统差有一定的影响，但是没有明确的规律。
[Abstract]:Time service is the basic technical support of a country. High precision time transfer and synchronization is an important part of time service, and it is also an important technical support for the stable continuation of international atomic time and the development of modern science and technology. The bidirectional satellite time-frequency transfer technique (TWSTFT) has been proved to be a good time propagation method with good accuracy and stability. In a short period of time, the stability test results are in agreement with the theory, and the long-term stability is being studied. There are many operational parameters in bidirectional satellite time-frequency transfer technology, of which RF frequency and spread spectrum rate are the most important and most likely to affect the stability and accuracy of bidirectional satellite time-frequency transmission. In order to study the influence of this parameter on the time-frequency transmission of bidirectional satellites, the experimental data obtained from the CAPS ground orbit network and Zhongwei satellite were used in the National time Service Center of the Chinese Academy of Sciences. Analyze the data and draw a conclusion. The main work of this paper is as follows: 1. This paper briefly introduces the development of bidirectional time and frequency transfer technology and the background and significance of the research. 2. The principle and error of bidirectional satellite time-frequency transfer technique are expounded. Two methods of this experiment, the three-station closing method and the zero-baseline method, are given, and the principle is introduced. 3. Based on the three-station closure method and the zero-baseline method, the bidirectional experimental data of different RF frequencies are analyzed. It is concluded that the radio frequency of 6047m is the ideal radio frequency in the bidirectional satellite time transfer technology. However, the accuracy and accuracy of the two kinds of RF frequencies are very small, which is of the same order of magnitude, so in the actual two-way satellite time-frequency comparison, we can consider the overall performance-price ratio, and then decide which RF frequency to adopt; 4. Based on the three-station closure method and the zero-baseline method, the bidirectional test data of different spreading code rates are analyzed. It is concluded that under the same spread code rate, the accuracy is basically the same, and the system difference is at the same level; Under the condition of different spread spectrum code rate, the precision value increases with the increase of spread spectrum code rate. Different spread spectrum code rate has certain influence on the system difference of bidirectional satellite time and frequency transmission, but there is no clear rule.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P127.1
[Abstract]:Time service is the basic technical support of a country. High precision time transfer and synchronization is an important part of time service, and it is also an important technical support for the stable continuation of international atomic time and the development of modern science and technology. The bidirectional satellite time-frequency transfer technique (TWSTFT) has been proved to be a good time propagation method with good accuracy and stability. In a short period of time, the stability test results are in agreement with the theory, and the long-term stability is being studied. There are many operational parameters in bidirectional satellite time-frequency transfer technology, of which RF frequency and spread spectrum rate are the most important and most likely to affect the stability and accuracy of bidirectional satellite time-frequency transmission. In order to study the influence of this parameter on the time-frequency transmission of bidirectional satellites, the experimental data obtained from the CAPS ground orbit network and Zhongwei satellite were used in the National time Service Center of the Chinese Academy of Sciences. Analyze the data and draw a conclusion. The main work of this paper is as follows: 1. This paper briefly introduces the development of bidirectional time and frequency transfer technology and the background and significance of the research. 2. The principle and error of bidirectional satellite time-frequency transfer technique are expounded. Two methods of this experiment, the three-station closing method and the zero-baseline method, are given, and the principle is introduced. 3. Based on the three-station closure method and the zero-baseline method, the bidirectional experimental data of different RF frequencies are analyzed. It is concluded that the radio frequency of 6047m is the ideal radio frequency in the bidirectional satellite time transfer technology. However, the accuracy and accuracy of the two kinds of RF frequencies are very small, which is of the same order of magnitude, so in the actual two-way satellite time-frequency comparison, we can consider the overall performance-price ratio, and then decide which RF frequency to adopt; 4. Based on the three-station closure method and the zero-baseline method, the bidirectional test data of different spreading code rates are analyzed. It is concluded that under the same spread code rate, the accuracy is basically the same, and the system difference is at the same level; Under the condition of different spread spectrum code rate, the precision value increases with the increase of spread spectrum code rate. Different spread spectrum code rate has certain influence on the system difference of bidirectional satellite time and frequency transmission, but there is no clear rule.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P127.1
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