摘要
研究了Galileo PPP参数估计及其误差处理方法,并采用MGEX 1924和1925周的数据进行了试验分析。结果表明,Galileo系统的平均可见卫星数不到GPS的一半。卫星数为4颗左右时,定位收敛通常需要180个历元,而达到6颗时仅需要66个历元。可见卫星数的增加显著提升了Galileo的收敛速度,随着卫星数的进一步增多将会达到与GPS收敛速度相当的水平。Galileo的3 h静态PPP收敛后的定位偏差约是GPS PPP的2.5倍,达到4.75 cm。随观测时间的增加定位精度提升显著,其6、12、24 h的定位精度分别能达到2.38、1.51和1.26 cm;其中12和24 h的定位精度比GPS略低约0.40 cm,但二者水平方向的精度优于1 cm,高程方向的偏差比1 cm稍大。
The method of parameter estimation and error processing of Galileo PPP is studied,and data from MGEX at week 1924 and 1925 are applied in the experiment to derive the PPP float solutions. The results show that the average number of available satellites of Galileo system is half less than that of the full GPS constellations.With the increase of the number of available satellites,the convergence speed increases significantly,in the condition of about 4 available Galileo satellites,180 epochs are necessary to converge,while about 6 available satellites,66 epochs are required. With the increase of the number of Galileo satellites,the convergence time reaches the same level with that of GPS. For 3 h observations,static PPP positioning deviation of 4. 75 cm can be achieved,which is about 2.5 times worse than that of GPS. However,with the increase of the observation time,the6 h,12 h,24 h positioning accuracy can reach 2.38 cm,1.51 cm and 1.26 cm respectively. The positioning accuracies of 12 h and 24 h are approximately 0.40 cm lower than that of GPS,nevertheless the accuracies of horizontal component are better than 1 cm,while those of the vertical component is slightly worse than 1 cm.
作者
李林阳
吕志平
翟树峰
黄娴
张学东
LI Linyang;LYU Zhiping;ZHAI Shufeng;HUANG Xian;ZHANG Xuedong(Information Engineering University,Zhengzhou 450001,China;State Key Laboratory of Geo-Information Engineering,Xi＇an 710054,China;Henan University of Technology,Zhengzhou 450001,China;31439 Troops,Shenyang 110000,China)
出处
《测绘科学技术学报》
CSCD
北大核心
2018年第2期159-164,共6页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(41674019
41604011)
地理信息工程国家重点实验室开放基金项目(SKLGIE2016-M-1-2
SKLGIE2016-M-2-2)
