GNSS多系统融合短基线解算方法研究与软件实现

发布时间：2018-04-28 21:04

本文选题：GNSS多系统融合 + 短基线　；参考：《安徽理工大学》2016年硕士论文

【摘要】：随着GNSS技术的发展,特别是我国北斗卫星导航系统的第二步计划的完成,多频多系统GNSS融合应用将成为GNSS导航定位主要发展趋势之一；目前具备独立服务能力的系统包括GPS、GLONASS和BDS；多系统融合,能极大地改善冗余度,改善定位精度,提高定位的稳定性,改善导航质量。本文主要研究工作：1)在研究GNSS多系统融合的时间系统与坐标系统统一理论与GNSS卫星坐标计算方法的基础上提出了多系统融合的主体方案。2)研究并建立了GNSS多系统融合基本模型：基于非差与双差的数学模型,基于高度角模型、信噪比模型与验后方差估计模型的随机模型,对流层、电离层等误差修改模型。3)研究并实现了GNSS多系统融合短基线解算关键技术：周跳探测技术,基于序贯平差与卡尔曼滤波的浮点解计算技术,LAMBDA算法固定模糊度技术。最后利用文中的算法开发出了一套BDS/GPS/GLONASS系统融合的短基线解算处理软件,并通过实验短基线数据,重点分析对比了BDS/GPS/GLONASS单系统、双系统以及三系统融合共7种模式下伪距单点、伪距双差和载波双差的定位性能,得出在短基线解算方面双系统定位精度与稳定性优于单系统,都能达到厘米级定位精度,三系统优于双系统的结论,从而验证了本软件的正确性和实用性。
[Abstract]:With the development of GNSS technology, especially the completion of the second step plan of Beidou satellite navigation system in China, the application of multi-frequency and multi-system GNSS fusion will become one of the main developing trends of GNSS navigation and positioning. At present, the independent service systems include GPS-GLONASS and BDS.Multi-system fusion can greatly improve redundancy, positioning accuracy, positioning stability and navigation quality. On the basis of studying the unified theory of time system and coordinate system of GNSS multisystem fusion and the calculation method of GNSS satellite coordinate, this paper puts forward the main project of multi-system fusion. 2) and establishes the GNSS multi-system. Fusion of basic models: mathematical models based on non-difference and double-difference, Based on height angle model, signal-to-noise ratio model and posteriori variance estimation model, tropospheric and ionospheric error modification model. Floating-point solution based on Sequential Adjustment and Kalman filter A fixed ambiguity algorithm based on Lambda algorithm is presented. Finally, a short baseline solution software for BDS/GPS/GLONASS system fusion is developed by using the algorithm in this paper, and the pseudo-range single point in BDS/GPS/GLONASS single system, double system and three system fusion mode is analyzed and compared through the experimental short baseline data. The positioning performance of pseudo-range double difference and carrier double difference shows that the positioning accuracy and stability of the two systems are better than that of the single system in short baseline solution, and the positioning accuracy of the three systems is better than that of the double system, and the positioning accuracy of the three systems is better than that of the two systems. The correctness and practicability of the software are verified.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P228.4

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