摘要
针对我国正在实施的自主发展、独立运行的北斗系统与国外已在运行的著名导航系统(美国全球定位系统、俄罗斯格洛纳斯卫星导航系统)在亚太低纬地区定位精度差异问题,提出了对这三个系统单点定位结果相互进行比对分析的研究思路。本文利用自主研发的单点定位程序对三系统在泰国春武里地区实测数据进行以下几方面的研究:全天实时可观测卫星数、单系统定位精度、组合系统定位精度以及不同权重对组合系统定位精度影响等。研究结果表明,北斗系统的定位内符合精度稍优于全球定位系统,外符合精度不如全球定位系统,北斗系统与全球定位系统的内外定位精度都明显优于格洛纳斯导航系统;相对于单系统,组合系统在定位稳定性方面有一定提高,但组合定位精度是否改善与单系统的卫星信号数目有关;不同权重的选择对组合定位精度有一定影响。本文的研究结果对促进北斗系统的海外应用具有一定的参考价值。
BeiDou navigation satellite system（BDS）has been completed its first phase deployment and is providing regional positioning and navigation services throughout the Asia-Pacific region.However,positioning accuracy differences exist between BDS and other running systems（GPS and GLONASS）,especially in the low latitudes area,because of satellites geometry,etc.This paper researched the positioning accuracy of BDS,GPS and GLONASS in the Asia-Pacific low latitudes area,aiming to make evaluation of their positioning differences and provide references for the overseas applications of BDS.The performance test was performed in Chonburi province,Thailand,2014.GPS/BDS/GLONASS data were collected and processed by self-developed software.Four evaluation criterions were carefully studied,i.e.observed satellite number,single system positioning accuracy,combined system positioning accuracy and the impact of different weights on positioning accuracy.The results indicated that the inner precision of BDS is better than GPS,while the outer precision of BDS is poorer than GPS.Both BDS and GPS have better inner and outer accuracies than GLONASS.With respect to a single system,the combined system has a certain improvement in the positioning stability,but the positioning accuracy is related to satellite numbers of the single system.Meanwhile,different weights have an impact on positioning accuracy.
出处
《导航定位学报》
2015年第2期29-33,共5页
Journal of Navigation and Positioning
