3 the procedure of gps data simulation is systematically studied and corresponding simulation software is complied the gps simulation data can be used to compare the different schemes of od designs and the different algorithms in one design (三)系统地研究了gps数据模拟问题，并编制了相应的gps数据模拟软件各种定轨方案的论证与比较需要星载gps模拟数据。
This is rather significant to kinmatic od with fewer observations 2 a comprehensive kalman filtering technique is presented in order to cope with the limitations when using traditional kalman filter for kinematic od . a comprehensive kalman filter is presented in this thesis (二)提出了一种综合卡尔曼滤波方法本文针对将卡尔曼滤波应用到星载gps定轨中时存在的问题，提出了一种综合卡尔曼滤波方法。
In contrast to conventional lse and kalman filtering , the algorithm has higher performance in precision orbit determination . moreover the algorithm is tested by simulation data and real observed data , and the computing results show that the algorithm is very effective 本文提出的这种算法比经典的最小二乘算法或kalman滤波方法具有更高的定轨精度，仿真数据和实际观测数据的计算结果证实了算法的有效性。
The result of gedex indicates that the orbit determination precision of space vlbi satellite is one of the main problems for geodetic study , therefore this investigation studies several technologies which possibly will be able to determine the orbit of space vlbi satellite Gedex实验结果表明定轨精度是限制vsop用于大地测量研究的主要障碍之一。因此,本文研究了可以对空间vlbi卫星精密定轨的几种技术和应用的可能性。
Followings are the main study in this paper . 1 ) based on building the condition function of orbit determination of satellite - to - satellite tracking , the coefficient matrix of its normal function was studied . and the relativity of satellite ’ s corresponding orbit elements was analyzed in different cases 本文的主要研究工作如下: 1 )在建立星-星跟踪定轨条件方程的基础上,对其法方程的系数矩阵进行研究,分析了在不同情况下,卫星对应的轨道根数的相关性。
By analyzing the method mathematically , the basic architecture of autonomous navigation system of constellation was designed . and also , the orbit determination method using whole net , the robust estimation method , and the integrated navigation method based on inter - satellite measurement and stellar refraction were studied emphatically 通过对该方法进行数学分析,设计了星座自主导航系统的基本框架,并重点研究了整网定轨方法、抗差估计方法和基于星间观测+星光折射的组合导航方法。
Above all , with the data acquired by tests , this thesis has analysized the lateral resistanc , longitudinal resistance and rail creep etc between ballast and sleeper before and after mass machine work , discussed the effect of mass machine on stability of continuously welded rail track , reseached the change regularity of fastening - down temperature of rail , which is resulted by mass machine work , and have settled the suitable range of work temperature which guarantees the stability of jointless railway . what ' s more , this thesis has put forward the appropriate work pattern , work temperature and work area for mass machine work in future . at the same time , this thesis has given rational suggestions about some conditions worth of attention in production of mass machine , which can in return raise the work productiveness of mass machine . at last , this thesis has considered formulating reasonable measures for operation organization and work standard , so that mass machine work can play an important role in maintenance , which can reduce work load , raise work efficiency and maintenance cost in daily maintenance 本文通过实测的各种数据，分别对大机作业前后道床对轨枕的横向阻力、纵向阻力、钢轨爬行情况等进行深入分析，进一步探讨大机作业对无缝线路稳定性的影响，研究大机作业引起的锁定轨温的变化规律，确定保证无缝线路稳定的合适作业轨温范围。为我国今后的大型养路机械作业提出合理的作业方式、合适的作业轨温和作业地段，同时对大型养路机械作业中应注意的问题提出合理化建议，为大型养路机械作业提供更高的安全保障，进一步提高大机作业效率。最后，对工务段在大机作业中的配合制定完善的施工组织措施及作业标准，使大机作业在养护维修中发挥更大的作用，为工务段日常的养护维修减少工作量，提高劳动效率，降低维修成本。
To sum up , tested and validated by data sets of shenzhou iv unmanned spacecraft and precise orbit ephemeris , the algorithms presented in the thesis can improve orbit accuracy and reduce random noise considerablely . derived conclusions have important value for reference , and lay the firm technological foundation for future applications 总之，经过神舟四号飞船实测数据计算和精密星历检验，表明本文提出的各种定轨方法可以较好的提高定轨精度，减少随机噪声，所得出的结论对于实际应用具有重要的参考价值，并为将来的应用奠定了坚实的技术基础。
The research on autonomous navigation and orbital keeping technology of geosynchronous satellites : selecting position vector in the inertia space and longitude , latitude , radial errors in the hill equation as state variables , the precision of orbit determination caused by track dynamic model error , sampling period , and sensor measurement and install error is analyzed 同步卫星自主导航与轨道保持技术研究：分别选取惯性空间位置矢量和采用hill方程表示的经、纬、向径误差作为状态量，分析轨道动力学模型误差、采样周期以及敏感器测量、安装等误差对定轨精度的影响。
Consideration in the long - term planning of mrt routes . other downsides to the single tunneling method are that it requires longer construction time , and that two break throughs from the tunnel to the work shaft involve a higher construction risk （一）本局规划手册所引用之消防逃生设计大多以美国国家消防协会（ national fire protection association ， nfpa ）中针对定轨运输系统设计之nfpa - 130规范为蓝本，再配合本地建筑法规及消防法令，故有必要重新检讨法令适用问题及如何配合修订相关法规。
