摘要
为了提高辅助全球导航卫星系统(AGNSS)的定位性能,实现用户在捕获卫星数不满足解算条件下进行有效定位,对只有3颗可见星情况下的定位方法进行了研究。采用AGNSS定位系统结构,以加快卫星捕获并提供辅助数据,通过2次观测数据的组合完成定位解算,并分析无卫星重复、有卫星重复以及2次观测间隔时长等因素对精度因子、定位性能以及置信度的影响。通过定位实验可知,随着2次观测间隔时长的增加,定位性能越来越好。当间隔时长为2 min,无卫星重复时的定位精度为2.22 m,1颗星重复时为3.21 m,2颗星重复时为16.76 m,3颗星完全重复时为38.72 m,其精度完全可以满足用户对位置的需求。
In order to improve the positioning performance of assisted Global Navigation Satellite System( ANGSS) and to implement effective positioning with imperfect positioning condition,a position method was studied under the condition of only three visible satellites. In this research,AGNSS positioning structure was used to capture satellite more quickly and to provide assisted data. The positioning results were calculated by the combination of double-observation data,then the influence of no overlapped satellites,overlapped satellites and the length of double-observation interval time on the dilution of precision( DOP),positioning performance and confidence were analyzed. The positioning results showed that the positioning performance was better with the interval of two observations increasing. When the length of interval time was 2 min,the positioning accuracy was up to 2. 22 m under the condition of no overlapped satellites,and the accuracy was 3. 21 m under overlapped one satellite,and the accuracy was 16. 76 m under overlapped two satellites,and the accuracy was 38. 72 m. The positioning accuracy could meet the needs of the users for position,and the AGNSS positioning performance was enhanced.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2013年第S2期123-128,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
国家高技术研究发展计划("863"计划)资助项目(2012AA120802)
