一种新的中长基线GPS RTK解算方法

发布时间：2019-03-25 12:15

【摘要】：为了消弱站间星间双差(以下简称双差)对流层延迟和电离层延迟的影响,减小中长基线下卫星升降对模糊度固定成功率的影响,实现中长基线实时动态高精度定位,设计了1种新的中长基线RTK解算方法。该方法以双差非组合观测量为基础,将残余的相对电离层和对流层天顶延迟视为高斯马尔科夫过程进行估计,在卡尔曼滤波方程中,同步估计用户站位置、相对对流层延迟、相对电离层延迟和双差模糊度,设计了部分模糊度固定策略及固定的模糊度进行强制约束,以提高模糊度解算的成功率和可靠性。基于实测数据分析了该方法在模糊度固定和RTK定位精度等方面的性能。结果表明:该方法能有效地改善中长基线模糊度固定的有效性,可提高实际环境的模糊度固定比率,改善定位性能。
[Abstract]:In order to reduce the influence of intersatellite double difference (hereinafter referred to as double difference) tropospheric delay and ionospheric delay, and to reduce the influence of satellite rise and fall on the success rate of ambiguity fixing at medium-long baseline, real-time dynamic and high-precision positioning of mid-long baseline can be achieved. In this paper, a new medium-long baseline RTK algorithm is designed. The residual relative ionospheric and tropospheric zenith delays are estimated as Gaussian Markov processes on the basis of double-difference non-combinatorial measurements. In Kalman filtering equations, the user station position and relative tropospheric delay are estimated synchronously. Relative to ionospheric delay and double difference ambiguity, a partial ambiguity fixed strategy and a fixed ambiguity degree are designed to enforce constraints to improve the success rate and reliability of ambiguity resolution. Based on the measured data, the performance of the method in ambiguity fixing and RTK positioning accuracy is analyzed. The results show that the proposed method can effectively improve the effectiveness of middle-long baseline ambiguity fixing, improve the ambiguity fixed ratio of real environment and improve the positioning performance.
【作者单位】：中国电子科技集团公司第五十四研究所;卫星导航系统与装备技术国家重点实验室;河北地质大学土地资源与城乡规划学院;东华理工大学测绘工程学院;
【基金】：国家国际科技合作专项基金资助项目(2013DFA10540) 卫星导航系统与装备技术国家重点实验室专项基金资助项目(EX1501D0063)
【分类号】：P228.4

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