GNSS海洋浮标星基增强定位方法及精化研究

Research on Application of GNSS Marine Buoy Satellite-Based Augmentation System

GNSS海洋浮标在海洋学研究中具有重要作用,其高精度的、可靠的位置信息是重要研究对象。利用全球卫星导航系统(GNSS)星基增强服务获取海洋观测环境下浮标的位置信息,以参数估计的均方误差作为内符合精度,以高精度软件IE(Inertial Explorer)解算结果作参考求定外符合精度,以此来评估一种星基增强服务Hi-RTP在GNSS海洋浮标上定位的精度和可靠性。基于海洋波浪的周期运动规律引入多项式拟合优化GNSS的高程解算值。实验结果表明,Hi-RTP服务在海洋浮标上的定位具有8 cm的内符合精度和1.9 m的外符合精度,相比标准单点定位有一定优势。另外,低阶多项式的拟合优化法有效弥补了观测缺失的情况,改善了高程的定位精度。该方法可为海上定位应用提供理论参考。

GNSS ocean buoys play an important role in oceanographic research,and their high-precision and reliable position information is an important researchissue.The contribution uses the Global Satellite Navigation System(GNSS) satellite based augmentation service to obtain the position information of buoys in the ocean observation environment.The mean square error of parameter estimation is used as the internal coincidence accuracy,and the high-precision software IE(Inertial Explorer) solution results are used as a reference to determine the external coincidence accuracy.The contribution evaluates the accuracy and reliability of a satellite-based augmentation service Hi-RTP on GNSS ocean buoys.Based on the periodic regularity of movement of ocean waves,polynomial fitting is introduced to optimize the height value of GNSS solution.The experiment results show that the Hi-RTP service has an internal coincidence accuracy of 8 cm and an external coincidence accuracy of 1.9 m for positioning on ocean buoys.It has superiority comparing to standard point positioning.In addition,the fitting optimization method of low order polynomials effectively compensates for the lack of observation and improves the positioning accuracy ofheight value.This method can provide theoretical reference for offshore positioning applications.