GPS/BDS/GLONASS/Galileo组合RTK在不同截止高度角下定位性能分析

Positioning performance analysis of GPS/BDS/GLONASS/Galileo combined RTK at different cutoff angles

针对单系统RTK在有遮挡信号的环境中难以实现高精度定位的问题,提出使用GPS/BDS/GLONASS/Galileo四系统组合RTK定位方法,并建立四系统伪距和载波相位双差非组合的数学模型,顾及GLONASS解算双差模糊度存在的频间偏差,利用LAMBDA模糊度搜索方法固定模糊度参数,用自主开发的软件对短基线数据进行双频RTK数据处理,获得不同卫星截止高度角下的定位结果并与单系统定位对比分析。实验结果表明,在40°大截止高度角下,四系统组合RTK定位能快速获得固定解,得到平面0.8 cm、高程3.3 cm的定位精度,改善遮挡信号区域RTK定位的连续性、可用性、可靠性和定位精度。

It is difficult to achieve high-precision positioning in a single system RTK in an environment with occlusion signals,GPS/BDS/GLONASS/Galileo four-system combined RTK positioning method can be proposed to use,and to establish a mathematical model of four-system pseudorange and carrier phase double difference non-combination with considering the inter-frequency deviation of GLONASS solution double-difference ambiguity.The ambiguity parameter is fixed by the LAMBDA ambiguity search method to process dual-band RTK data of short baseline data with self-developed software.The positioning results under different satellite cut-off elevation angles are obtained compared with single system positioning.Experimental result shows that the four-system combined RTK positioning can quickly obtain a fixed solution and obtain a positioning accuracy of 0.8 cm in plane and 3.3 cm in elevation under the 40°large cutoff height angle,and the continuity,availability,reliability and positioning accuracy of the occlusion signal region RTK positioning can be significantly improved by the method.