一种简易的双星定位系统定位解算方法

One Position Solution Method of Double-Star Positioning System

摘要:

双星导航定位系统采用双星定位体制,其定位基本原理为三球交会测量原理,其中2颗量测量与用户到2颗卫星的距离有关,与用户高程有关的第3个量测量是决定系统定位精度的关键因素。为此,为了简化定位算法,文章根据地球椭球几何及大地纬度的相关知识,推导了与用户高程有关的第3个量测量的精确模型,进而建立了用户的定位算法。该算法具有简单易懂的特点,并且仿真试验证明,该算法具有收敛速度快,定位准确的特点。

Abstract:

Double-star navigation positioning system adopts the mechanism of double-star positioning, and the basic position principle is that of three-sphere intersection measurement, where two observations are related to the distances between the two satellites and the survey station, and the third observation which is related to the survey station’s height is the critical factor that determines the system’s position accuracy. Thus, in order to simplify the positioning algorithm, and according to the relevant knowledge of earth ellipsoid, in this paper, the precise model of the third observation related with the user’s height was deduced, then the positioning algorithm was established. This algorithm had the characteristic of simplicity and understandability, and the simulation experiment results show that the algorithm had the characteristic of quick convergence rate and high accuracy of position