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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第05期

页码:

802-813

栏目:

大地测量、遥感与地学大数据

出版日期:

2022-09-15

文章信息/Info

Title:

Actual Measurement Accuracy of BDS/GPS Fusion PPP Used in Crustal Deformation Monitoring

文章编号:

1672-6561(2022)05-0802-12

作者:

张怀¹; 聂兆生^1*; 刘刚¹; 熊维¹; 刘格格²; 黄健德²; 王东振¹; 倪乙鹏¹

(1. 中国地震局地震研究所,湖北 武汉 430071; 2. 武汉大学 测绘学院, 湖北 武汉 430079)

Author(s):

ZHANG Huai¹;  NIE Zhao-sheng^1*;  LIU Gang¹;  XIONG Wei¹;  LIU Ge-ge²;  HUANG Jian-de²;  WANG Dong-zhen¹;  NI Yi-peng¹

(1. Institute of Seismology, China Earthquake Administration, Wuhan 430071, Hubei, China; 2. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, Hubei, China)

关键词:

北斗卫星导航系统;  全球定位系统;  精密单点定位;  BDS/GPS融合;  地壳形变监测;  恶劣观测环境;  实测精度;  数据质量

Keywords:

BDS;  GPS;  precise point position;  BDS/GPS combination;  crustal deformation monitoring;  harsh observation environment;  measured accuracy;  data quality

分类号:

P228

DOI:

10.19814/j.jese.2022.02018

文献标志码:

A

摘要:

针对实际GNSS地壳形变流动监测中信号遮挡比较严重,GPS可视卫星数较少等问题,采用BDS/GPS双系统观测,分析了BDS/GPS双系统在实际流动测站观测中对精密单点定位(PPP)性能的改善。基于四川石棉地区GNSS地壳形变监测网实际流动测站观测数据,分析了在实际观测环境以及模拟更恶劣观测环境下BDS单系统、GPS单系统和BDS/GPS双系统等3种定位模式的可视卫星数、几何精度衰减因子(GDOP)、定位精度和历元利用率。结果表明:在观测环境较差的山区,BDS/GPS双系统可大大提高可视卫星数,几何精度衰减因子降低,显著改善卫星空间几何结构,提高收敛速度和定位精度; 与BDS单系统、GPS单系统相比,BDS/GPS双系统收敛速度可提高50%～80%,定位精度可提高20%～50%; 单系统定位精度受高度角影响较大,BDS/GPS双系统在较高高度角时仍可保持较高精度,稳定性更强; 在遮挡严重地区,为保证有充足双频观测值,可视卫星数需有6颗或6颗以上。BDS/GPS双系统因其高稳定性和高精度,更有利于在地形起伏剧烈区域捕捉地壳形变及地震产生的微弱位移信号,在复杂观测环境(山区、树林、建筑物密集区)具有更好的应用价值。

Abstract:

In view of the serious signal occlusion and the small number of GPS visible satellites in the actual GNSS crustal deformation rover monitoring, the BDS/GPS dual system observation was adopted, and the improvement of the precise single point positioning performance of BDS/GPS in the actual rover observation was analyzed. Based on the observation data of the GNSS crustal deformation monitoring network in Shimian area of Sichuan, the number of visible satellites, GDOP value, and the positioning accuracy and epoch utilization of the three positioning modes of BDS, GPS and BDS/GPS in the actual observation environment and the simulated worse observation environment were analyzed. The results show that BDS/GPS can greatly increase the number of visible satellites, reduce the GDOP value, significantly improve the satellite spatial geometry, and improve the convergence speed and positioning accuracy in mountainous areas with poor observation environment; compared with BDS and GPS, the convergence speed can be increased by 50%-80%, and the positioning accuracy can be increased by 20%-50%; the positioning accuracy of a single system is greatly affected by the altitude angle, and the BDS/GPS can still maintain high accuracy and stability at higher altitude angles; in heavily shaded areas, in order to ensure sufficient dual-frequency observations, the number of observation satellites must reach 6 or more. With its high stability and high precision, BDS/GPS is more conducive to capturing the weak displacement signals of crustal deformation and earthquakes in areas with severe terrain fluctuations, and has good application in complex observation environments(mountains, forests, and densely built areas).

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相似文献/References:

备注/Memo

备注/Memo:

收稿日期:2022-02-14; 修回日期:2022-04-25投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(42074015,41874018); 中国地震局星火计划攻关项目(XH20038); 国家重点研发计划项目(2018YFE0206100)
作者简介:张 怀(1997-),男,河北河间人,工学硕士研究生,E-mail:huaizhang__97@163.com。
*通讯作者:聂兆生(1982-),男,山东泰安人,正高级工程师,E-mail:niezhaosheng@126.com。

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更新日期/Last Update: 2022-10-01