【作者】 张伦；

【导师】 周渭；

【作者基本信息】 西安电子科技大学 ， 检测技术与自动化装置， 2008， 硕士

【摘要】 在精密导航定位中,星地时间同步是一个重要的研究方向。在卫星导航定位系统中,用户在空间参考系的坐标,是通过测量卫星与用户之间信号的传输时间来确定的。因此,卫星与地面系统之间时间同步的好坏,直接影响定位精度的高低。星地时间同步的精度和可靠性对导航系统的定位精度和性能有重大影响。由于影响星地时间同步精度的原因很多,所以必须选择合适的处理方法,进行星历误差、电离层误差、对流层误差、多普勒效应误差和设备时延等误差的修正。目前,国内外已经提出了一些对于这些误差的修正方法,但是大多都很浅显,特别是国内,在这方面与国外相比还比较落后,而且,很少有仿真结果的分析和论证,所以需要进一步的深入研究。近年来,我国又在构建第二代卫星导航系统。因此,星地时间同步技术的研究也显得尤为迫切和关键。本论文正是应国内卫星导航系统的发展需要,展开对导航卫星星地时间同步技术的研究。本课题由航天某研究所提出,要求综合分析导航卫星的星地时间同步方案,分析上述各种误差并提出解决方案,并设计单向法和双向法的时间同步方案。本论文是在GPS导航卫星星地时间同步的基本原理上,阐述了卫星导航定位系统中,星地时间同步常用的单向时间同步、双向时间同步等方法,重点仔细研究和分析了影响同步精度的各项误差的处理方法,并进行了仿真研究。最后,提出了星地时间同步技术的单向法和双向法的具体实施方案。其中的研究成果和仿真结果,对当今国内外此领域的研究与发展具有十分重要的意义。更多还原

【Abstract】 Time synchronization between satellite and the ground station is an important part of the navigation and positioning system. In the satellite navigation and positioning, the position coordinates of the users in the space reference frame are obtained by measuring the transmission time between satellite and users. Therefore, it is fine or not of the time synchronization between satellite and the ground station will impact the positioning accuracy directly. The precision and reliability of the time synchronization between satellite and the ground station cause a great effect to the positioning accuracy and performance of the navigation system.For the precise time synchronization between satellite and the ground station, proper approach must be chosen to reduce the effects to synchronization precision of ephemeris error, ionosphere error, troposphere error, Duopule effects error and time delay error of devices. Currently, some revision methods for these errors have been developed all over the world, but most are superficial. Especially domestic technology at this aspect drops behind the foreign. And there is not any analysis or argumentation of the simulation results, so further study is needed.In recent years, our country is constructing the second generation satellite navigation system. Therefore, the research on time synchronization technology between satellite and the ground station become exigent and pivotal. This thesis is just to the need of the developing of our country’s satellite navigation system, and the research on the time synchronization technology of navigation satellite is developed.This thesis is brought forward by one research institute with the demand that we analyze and demonstrate the scheme on the time synchronization between navigation satellite and the ground station, and especially analyze the revision model to the errors above. In the end, we design schemes about the one-way and two-way time synchronization technology between satellite and the ground station. The research fruit and simulation results make great sense to the research in this field inside and outside our country.更多还原