论文部分内容阅读
Multi-source navigation system consists of GNSS,aerial pseudolite positioning system and ground pseudolite positioning system.In this paper,the relationship between the elevation,azimuth and GDOP of multi-source navigation system was analyzed,and the error factors of navigation source involved in the multi-source navigation system was analyzed,finally,this paper proposed a fast selection algorithm for multi-source navigation system.Firstly,the elevation angle of the visible navigation source to the receiver is obtained,and classify them by elevation into low elevation area,medium elevation area and high elevation area; secondly,the azimuth angle of the visible navigation source to the receiver is obtained,and get a set including N(N>7) navigation source based on the fast naviga-tion source selection algorithm; Finally,according to the error factor for each type of navigation source and the erroneous value,combining navigation source selection algorithm based error,select 6 group of navigation source from the above set.Simulation shows that multi-source navigation system select navigation source using elevation and azimuth with proper calculation,enhancing the positioning solution speed of the receiver.