【作者】 朱琳；

【导师】 李孝辉； 张慧君；

【作者基本信息】 中国科学院研究生院（国家授时中心） ， 通信与信息系统， 2013， 硕士

【摘要】 多模卫星导航是未来卫星导航系统发展的重要方向,而实现多模卫星导航亟待解决的重点问题之一是GNSS系统时间的兼容与互操作。本文根据多模卫星导航的发展需求，开展了通过接收空间信号实现GNSS系统时差监测方法的研究。在研究单站系统时差监测原理及各种误差分布的基础上，利用IGS精密星历数据对单站系统时差监测精度进行了改善。在此基础上，研究了GNSS系统时差多站联合监测方法，设计并搭建了系统时差多站联合监测系统。该系统已经连续、稳定试运行3个月，大量的数据分析结果表明了GNSS系统时差多站联合监测方法是合理的，该系统的设计方案是切实可行的。论文主要研究内容及开展的工作如下：分析了GNSS导航系统时间及系统时间偏差产生的原因；研究了GNSS系统时差监测的多种方法并分析了各种方法的优劣。本文重点研究了单站接收空间信号监测GNSS系统时差的方法，分析了各种误差分布。研究了基于UTC(NTSC)的接收机时延的测量方法并给出了测量结果；分析了卫星高度角对电离层延迟、对流层延迟和监测结果的影响；研究了利用IGS精密星历修正监测结果的方法，同时，利用BIPM T公报数据对修正前后的监测结果进行评估。结果表明，利用IGS精密星历修正广播星历能够在一定程度上改善单站监测结果。在单站系统时差监测方法的基础上，提出了GNSS系统时差多站联合监测方法。阐述了多站联合监测GNSS系统时差的必要性，研究了该方法的原理，对误差源进行了分析，并设计了多站联合监测系统时差的算法。基于以上研究，给出了GNSS系统时差多站联合监测系统的总体设计方案，包括硬件组成和软件系统设计。与此同时，通过零基线比对实现系统的校准，并且利用BIPM T公报数据对该系统的调试结果进行分析。结果表明，该论文所采取的GNSS系统时差多站联合监测方法是合理的。通过对GNSS系统时差单站和多站联合监测结果的分析得知，两种监测方法均能够实现5ns的监测精度，该精度与Galileo设计的GGTO（GPS to Galileo Time Offset）指标相当。更多还原

【Abstract】 Multi-mode satellite navigation is an important development direction of Global NavigationSatellite Systems (GNSS), and one of the key issues that should be solved to implementmulti-mode satellite navigation is to realize compatibility and interoperability among GNSSsystem time.According to the requirements for the development of multi-mode satellite navigation, amethod of monitoring GNSS system time offset is researched by means of reception ofSignal-in-Space (SIS). At beginning of this case, the monitoring principle and the errordistribution of one-station monitoring GNSS system time offset is described. The monitoringaccuracy of one-station is improved with IGS precise ephemeris. Then, based on anaylsis offeatures on one-station monitoring methods, a method of multi-station combined monitoringGNSS system time offset is proposed. Meanwhile, a system based on the method is designed andconstructed. After three months test, plenty of data are analyzed and the results show that thesystem runs stably and reliably, the monitoring method by multi-station is reasonable and thedesign of multi-station monitoring system of GNSS system time offset is reasonable.The main works of this paper are shown as follows:The generations of GNSS time system and system time offset between GNSS are analyzed;Several monitoring methods of GNSS system time offset are discussed, and thecharacteristics of each method are analyzed. In this paper, one-station monitoring GNSS systemtime offset by reception of SIS is mainly researched and its errors distribution is analyzed. Inorder to correct some errors of the mornitoring method, a method of receiver delay calibrationbased on UTC (NTSC) is applied and its results are gained. Meanwhile, the influences ofsatellite elevation on ionosphere correction and troposphere correction as well as monitoringresults are analyzed. In addition, a correction method of system time offset measuring results isstudied with IGS precise ephemeris. Furthermore, circular T bulletin data published by BIPM isapplied to evaluate the results of both monitoring and correcting, which shows that the accuracyof one-station monitoring GNSS system time offset is improved by means of correctingbroadcast ephemeris error with IGS precise ephemeris.Based on one-station monitoring method of GNSS system time offset, a method ofmulti-station combined monitoring is proposed. The necessity of this method is expounded, andthe design principle of which is researched, as well as error source of the method is analyzed. Inaddition, the algorithm of this method is mainly studied. In view of above studies, a systembased on this method is designed and construced. This system consists of hardware and software. As for the system before operation, it should be calibrated by zero-baseline comparisonexperiment. At last, the debugging results of this system compared with circular T bulletin datashow that multi-station combined monitoring method of GNSS system time offset is reasonable.Through the analysis of one-station and multi-station combined monitoring results of GNSSsystem time offset, monitoring accuracy of5ns is realized by two monitoring methods. And themonitoring accuracy is equivalent to the GGTO (GPS to Galileo Time Offset) index designed byGalileo.更多还原