【摘要】 伪卫星距接收机的距离比导航卫星小数个量级,相应系统的几何布局变化很大,在没有较精确初值的情况下使用线性化递推的导航算法将可能使算法发散或者收敛到错误点。文中采用非递推的定位算法实时并较精确地确定接收机的位置,为滤波器提供较精确的位置初值。仿真结果表明,此算法可较大程度地避免纯伪卫星系统中导航算法收敛位置错误的问题,更可靠和精确地实现导航和定位。更多还原

【Abstract】 The range between the pseudolites and a receiver is far less than that between navigation satellites and a receiv- er,and correspondingly the geometric arrangement of a pseudolite system is more diverse.As a result,the use of lin- earization and iterative algorithm without prior information of initial position in navigation may lead the algorithm to di- vergence or convergence to an incorrect solution.The non-iterative algorithm employed in this paper can precisely and real-time give the receiver position of the pseudolite-only systems,and the result of which can be used as the initial posi- tion for the navigation filters.Simulation results indicate that the method proposed in the paper can more effectively a- void the convergence problem of navigation filters used in pseudolite-only systems and more reliably realize precise navi- gation and positioning.更多还原