摘要
针对模糊度的固定率不高的问题,该文提出了一种分步式组合部分模糊度固定方法。首先,通过信噪比、高度角以及卫星连续追踪的历元数筛选可固定的模糊度;然后,采用LAMBDA方法对其进行固定,如果固定失败则依据卫星的连续跟踪数、模糊度浮点解方差以及浮点解相位残差选择模糊度最优子集重新搜索固定;最后,在Ratio检验的基础上,增加模糊度历史信息检验。采用自主编制的软件对低纬度地区静态与动态中短基线双频GPS/BDS/GLONASS实测数据进行处理,结果表明:采用本文研究的方法能够一定程度上控制未收敛的模糊度影响,提高模糊度固定成功率,同时尽可能地保证了模糊度固定的可靠性。
In order to improve the success rate of ambiguity fixing,the paper researched a partial ambiguity resolution strategy base on sub-step combination control.First,the SNR,satellite elevation,and satellite tracking number were used to screen the ambiguity;second,the ambiguity is resolved by LAMBDA algorithm.If ambiguityresolution failed,the best subset of ambiguity which selected based on satellite tracking number,variances of ambiguity floating solution and residuals of ambiguity floating solution is Re-search fixed;Finally,on the basis of the Ratio test,the ambiguity history information test is added.A low latitudes static and kinematic GPS/BDS/BDS medium-short baseline observation data were processed by our own software.The results of the static case and kinematic case showed that the influence of un-convergence ambiguity can be controlled efficiently and the success rate of ambiguity fixing is improved.At the same time,the strategy ensured ambiguity＇s reliability.
作者
邵晓东
陈源军
史小雨
单弘煜
SHAO Xiaodong;CHEN Yuanjun;SHI Xiaoyu;SHAN Hongyu(Hi-Target Surveying Instrument Co.Ltd.,Guangzhou 511493,China)
出处
《测绘科学》
CSCD
北大核心
2018年第11期15-19,共5页
Science of Surveying and Mapping
关键词
中短基线
模糊度固定率
部分固定
分步式组合
medium-short baseline
the rate of ambiguity fixing
partial resolution
sub-step combination
