惯导辅助GNSS整周模糊度快速固定

GNSS integer ambiguity rapid resolution aided by INS

为了实现高精度全球定位系统(global positioning system,GPS)动态相对定位,文章根据惯性导航系统(inertial navigation system,INS)短时间内精度较高,不易受到外界干扰的特点,提出使用INS输出的位置信息辅助确定整周模糊度算法。在分析INS精度的基础上,利用INS辅助确定模糊度,比较恢复整周模糊度所需要的时间,评估加入INS对固定整周模糊度的帮助。实验结果表明,如果出现短时间的信号失锁,在INS的辅助下,固定模糊度所需要的时间可以被大幅度缩短;当信号失锁持续2s内时,整周模糊度可以被瞬时恢复。

In order to achieve high accuracy global positioning system(GPS)dynamic relative positioning,the coordinate information produced by inertial navigation system(INS)is used to solve the ambiguity estimation problem,considering the high position accuracy of INS and its ability not to be interfered by external condition.Firstly,the accuracy of INS is analyzed.Secondly,GPS ambiguity resolution aided by INS is processed and the time to fix the integer ambiguity is used to measure how INS aiding affects the ambiguity resolution process.The results show that the time to resolve the integer ambiguities after GPS data outages is significantly shortened with the assistance of INS;instantaneous integer ambiguity resolution is found to be possible within two seconds after GPS data outages.