摘要
北斗卫星导航系统能全星座播发3个频率的观测值,有利于载波相位模糊度的解算。本文以传统的CIR方法为基础,分析了其在短基线和长基线计算时的优点和限制。针对于电离层延迟的影响,经典的CIR难以实现长基线模糊度固定的问题,本文提出了一种附有约束条件的适用于长基线的改进CIR算法,利用北斗三频数据对算法性能进行了验证。实验表明:提出的新算法能够提高长基线宽巷模糊度的固定成功率,并且能够很大程度上缩小窄巷模糊度的搜索空间,使其估值的波动能够在4周以内。
The Beidou satellite navigation system can broadcast the observations of three frequencies in the full constellation,which is helpful for the solution of carrier phase ambiguity.Based on the traditional CIR method,the advantages and limitations of short baseline and long baseline calculations are analyzed.Aiming at the problem that the classical CIR is difficult to achieve the fixed ambiguity due to the influence of the ionosphere delay,an improved CIR algorithm that is suitable for long baseline is proposed.The performance of the algorithm is verified by using the Beidou triple-frequency observations.The experiment shows that the proposed new algorithm can improve the fixed success rate of wide-lane ambiguity for long baseline,and can greatly reduce the acquisition space of narrow-lane ambiguity so that the estimation error can be within 4 cycles.
作者
崔鑫
CUI Xin(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610000,China)
出处
《测绘与空间地理信息》
2020年第4期158-162,共5页
Geomatics & Spatial Information Technology
关键词
北斗三频
模糊度解算
电离层延迟
CIR
长基线
Beidou triple-frequency
ambiguity resolution
ionospheric delay
CIR
long baseline
