刘帅, 孙付平, 李海峰, 刘婧, 郝万亮. GLONASS辅助动态GPS精密单点定位模糊度固定[J]. 武汉大学学报 ( 信息科学版), 2016, 41(9): 1238-1244. DOI: 10.13203/j.whugis20140494
引用本文: 刘帅, 孙付平, 李海峰, 刘婧, 郝万亮. GLONASS辅助动态GPS精密单点定位模糊度固定[J]. 武汉大学学报 ( 信息科学版), 2016, 41(9): 1238-1244. DOI: 10.13203/j.whugis20140494
LIU Shuai, SUN Fuping, LI Haifeng, LIU Jing, HAO Wanliang. GLONASS Aided Ambiguity Fixing for Kinematic GPS PPP[J]. Geomatics and Information Science of Wuhan University, 2016, 41(9): 1238-1244. DOI: 10.13203/j.whugis20140494
Citation: LIU Shuai, SUN Fuping, LI Haifeng, LIU Jing, HAO Wanliang. GLONASS Aided Ambiguity Fixing for Kinematic GPS PPP[J]. Geomatics and Information Science of Wuhan University, 2016, 41(9): 1238-1244. DOI: 10.13203/j.whugis20140494

GLONASS辅助动态GPS精密单点定位模糊度固定

GLONASS Aided Ambiguity Fixing for Kinematic GPS PPP

  • 摘要: 与模糊度为浮点解的精密单点定位(precise point positioning,PPP)相比,PPP模糊度固定技术具有更快的收敛速度和更好的定位精度。但当GPS卫星数目少或几何构形不好时,需要较长时间实现GPS PPP模糊度的首次固定,通过加入GLONASS卫星可以有效缩短首次固定时间。推导了基于整数相位钟法的GPS/GLONASS组合PPP模型并进行了大量实验解算。40组静态模拟动态实验表明,GPS PPP模糊度首次固定平均需要50.2 min,但在GLONASS辅助下只需25.7 min,减少了48.8%,而且定位精度也有提高。车载动态实验表明,由于受观测条件限制,GPS PPP模糊度难以固定,但在GLONASS辅助下仍能实现GPS PPP模糊度固定。

     

    Abstract: Compared to ambiguity-float precise point positioning (PPP), ambiguity-fixed PPP needs a short convergence time and has better positioning accuracy. However, when there are only a few GPS satellites without an optimal geometrical distribution, ambiguity-fixed PPP requires time to achieve a first fixed solution. The objective of our research was to reduce the time to first fixed solution (TFFS) for GPS-only PPP by adding GLONASS satellites. An observation model for GPS/GLONASS ambiguity-fixed PPP using the integer phase clock method was developed and tested. Forty kinematic tests using static data show that the average TFFS is 50.2 min for GPS ambiguity-fixed PPP while only 25.7 min for GPS/GLONASS ambiguity-fixed PPP; reduced by 48.8% after adding GLONASS observations. A vehicular test demonstrates that GPS-only PPP cannot get its first fixed solution due to a less than ideal observation environment while GPS/GLONASS PPP can realize ambiguity fixing.

     

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