【作者】 康国栋；

【导师】 郭陈江；

【作者基本信息】 西北工业大学 ， 电磁场与微波技术， 2006， 硕士

【摘要】 伪卫星对于卫星导航定位系统来说是一种非常有用的增强手段,它不但能够增加卫星导航系统在复杂环境下的覆盖范围,而且能够提升整个系统的稳定性、可靠性以及测量精度。并且伪卫星还可以组成单独的定位系统,进行独立定位。本论文研究的伪卫星定位系统采用伪卫星主从站结构,由伪卫星主站分别向用户和其它三个伪卫星从站发送信号,再由伪卫星从站将信号转发给用户的方法实现定位。 首先,本论文研究了基于Gauss-Newton迭代法的伪卫星线性化单点定位算法,然后在此基础上给出了伪卫星转发定位算法,从具体的算法中可以看出,接收机的时钟偏差项已被消除。然后,论文介绍了伪卫星技术发展过程中出现的几种伪卫星设计方案,对伪卫星的关键技术进行了分析,介绍了伪卫星定位系统的时间同步原理,研究了提取同步脉冲的方法并给出了伪卫星正交解调器的具体设计。接着,本论文还对伪卫星串口通信协议进行了研究,对比了不同的编程方法,给出了伪卫星串口通信用户层协议的程序流程图,并根据伪卫星转发定位算法编制了位置解算程序。最后,本论文对基于北斗定位系统的伪卫星优化布局问题进行了详细研究,先从理论上分析了伪卫星布局的一般原则,然后结合具体情况进行了仿真分析,并得出了相应的结论。更多还原

【Abstract】 For satellite positioning system, the pesudolite is a very useful augmentation method. It can not only enlarge the satellite positioning system’s coverage area in complex circumstance, but also enhance the whole system’s stability, reliability and precision. Meanwhile, the pesudolite can be built in an independent system to achieve positioning. Pesudolite principal and subordinate structure adopted in the pesudolite positioning system is studied. During the course of positioning, the pesudolite transmission positioning method, which the principal pesudolite transmits signals to the user receiver and the subordinate pseudolites, then the subordinate pseudolites transmit the signal received from the principal pesudolite to the user receiver, is studied.Firstly, the pesudolite linearization single point positioning algorithm based on Gauss-Newton iteration is investigated in this dissertation, then the pesudolite transmission positioning algorithm is presented, in which the receiver clock offset and the common error of pesudorange measure are eliminated. Secondly, the serial communication protocol is investigated, different programming methods are contrasted and the programme flow chart is presented. Thirdly, several pesudolite design schemes are introduced. The pesudolite key technologies are also analyzed here, and then the time synchronization principle is introduced and the pesudolite quadrature demodulator is designed which is used for distilling the synchronization pulse. In the end, the optimize geometry of pseudolites based on BeiDou positioning system is discussed in detail. The foundational theory of optimize geometry is analyzed, then the simulation is carried out and the conclusions are also given.更多还原