【作者】 邢薇；

【导师】 肖昌炎；

【作者基本信息】 湖南大学 ， 仪器科学与技术， 2011， 硕士

【摘要】 卫星授时作为一种崭新的授时技术,能有效消除地域影响、实现全球范围内精确授时,已成为当前时间同步领域的主流方法。卫星接收机是连接卫星与地面用户的通道,其性能将直接影响授时系统的可靠性,也是提高卫星系统竞争力的关键因素。本论文针对一款卫星授时接收机的性能优化和产品测试展开研究,目的在于促进北斗卫星系统的民用化,主要包括基于铷原子频标的时间基准源设计和卫星授时接收机测试系统开发两部分内容:（1）为提高卫星接收机的授时精度和稳定度,选用时间标准设备中最准确、最稳定的原子频标代替石英晶体振荡器,减小了接收机钟差,优化了接收机的精度和工作性能。本文在分析研究了铷原子频标X72的工作原理、控制方法及频率特性基础上,设计了数据通信、信号输出与扩展、频率调节、告警等硬件模块,完成了时间基准源的PCB电路板设计,并简要说明了设备的校准与维护工作。（2）卫星接收机测试系统的目的在于对其产品质量的控制和优化,针对测试需求制定了测试系统软件设计方案,通过C++ Builder软件编程实现了接收机与计算机的数据通信,完成了数据的实时监控、分析与故障报警,利用数据库实现测试结果的海量存储与回放查询。测试系统能够全面分析接收机的动态性能和长期稳定性,提升接收机数据分析的效率,更加准确了解接收机整体运行及工作状况。对本文设计的时间基准源设备进行了性能指标测试,频率准确度为±5×10^-11,符合各项技术要求,具有一定的实用和推广价值;研究的测试系统已实现了对双模卫星授时接收机的实时测量和监控,对产品化过程中接收机的性能分析和故障定位起到关键作用,有效减轻了测试人员的劳动强度。更多还原

【Abstract】 As a new timing technology, satellite time service can effectively reduce the error caused by geometric factors and achieve precise timing on a global scale, so it has become the mainstream method in the time synchronization field. The satellite receiver is a connector between satellite and ground users. Its performance will directly affect the reliability of time service system and determines the competitiveness of the satellite system as a key component.Aim to provide domestic application of satellite time service using Beidou satellite systems, this thesis studies on the performance optimization and testing technique of a satellite time service receiver. The main work includes two parts, the design of time reference source based on rubidium atomic frequency and the testing system of satellite time service receiver.（1） In order to improve the timing precision and stability of satellite receiver, the atomic frequency standard, which is the most accurate and stability among all the standard equipment, is adopted instead of quartz crystal oscillators,thus helps to reduce the receiver clock error and optimizes the accuracy and performance of the receiver. According to the operating principle, control methods and frequency characteristic of the rubidium atomic frequency standard X72, the thesis designs the data communication, signal output and expansion, frequency adjustment, alarm and other auxiliary hardware modules. The PCB circuit board for the whole time reference source is finished and the equipment calibration and maintenance method are given briefly.（2） The testing system provides a measure for controling and optimizing the quality of the satellite receiver. According to the specific requirements, a software design scheme for the testing system is proposed. Data communication module, which accomplishes real-time data monitoring and alarm on faults, is realized using C++ Builder software. Combing with a database, the test system can storage and playback information of testing results between the receiver and computer massively. The testing system can carry on comprehensive analysis of the dynamic performance, long-term stability of the receiver,improve the efficiency of the receiver data analysis, as well as record more accurate running status and working conditions of the receiver.The performance characteristics of the proposed time reference source has been tested, its frequency accuracy is±5×10^-11. The device satisfies harsh technical requirements and has practical application values. The testing system can be utilized for real-time testing and monitoring of the dual-mode satellite timing receiver. It plays a key role in performance analysis and fault location in the production process, which effectively reduces labor intensity of the testing workers.更多还原