一种利用双星系统对无人机实时定位的方法  

A method to Enhance Real-Time Performance of RDSS Based on Time Error Modeling

作　　者：孙国良[1] 沈士团[1] 

机构地区：[1]北京航空航天大学电子信息工程学院204教研室,北京100083

出　　处：《系统仿真学报》2008年第S1期529-533,共5页Journal of System Simulation

摘　　要：针对双星系统有源定位间隔长、实时性差,无法用于无人机定位的缺陷,提出利用钟差辅助双星无源伪距进行实时定位的方法。该方法基于用户钟差与运动无关且规律性较强的特点,利用有源定位数据对钟差进行建模。通过钟差模型预测辅助双星无源单程伪距进行实时定位,从而消除了简单位置外推对运动模型的依赖。通过理论分析了方法的可行性,给出了钟差建模及定位的具体算法流程。借助某实际飞行数据的仿真验证表明该方法不仅可以对无人机进行实时高精度定位,同时可减少对有源定位询问频度的依赖,从而减少电磁暴露。Radio Determination Satellite Service(RDSS) System has some limitations on application,such as limited user amounts,longer time lag,and worse dynamic positioning performance.A real-time Positioning method was put forward in order to resolve this problem.The position data obtained through RDSS active way is used to build time-error model. Pseudo-range can be corrected to real distance with the forecast of the model.With the height information and corrected pseudo-ranges,user can calculate its position in real time.Mathematic analysis and details for building Time-error model and position determination were given.Additionally,it is also verified through computer simulation.As the result shows that it can not only satisfied the requirement of real-time and precise positioning performance,but also reduce the rate of active positioning and decrease the burden of the master center.

关 键 词：双星定位 钟差建模 计算机仿真 

分 类 号：P228.4[天文地球—大地测量学与测量工程]