【摘要】 在跨海沉管隧道施工中,传统单基准站RTK技术因受多路径效应、电离层扰动及长基线误差的制约,难以满足高精度安装要求。本研究创新提出海上多基准站GNSS协同定位技术,通过构建多基线冗余解算体系、设计多路径抑制算法,并结合组合模糊度快速固定方法,有效削弱电离层延迟的影响。试验数据显示,采用三基准站组网模式(基线长度≤5 km)时,平面定位精度可达±5 mm。该技术在深中通道沉管工程E6—E8管节区域进行了工程试验,成功克服低纬度电离层活跃、多路径干扰等难题,实现8万t沉管的高质量对接,充分验证了该技术在大面积水域复杂环境下的精确性与可靠性,为远海工程高精度定位提供了创新解决方案和实践范例。更多还原

【Abstract】 In the construction of cross-sea immersed tunnels,traditional single-base station RTK technology is limited by multipath effects,ionospheric disturbances,and long baseline errors,making it difficult to meet the requirements of high-precision installation.In this study,the offshore multi-base station GNSS collaborative positioning technology is innovatively proposed.By constructing a multi-baseline redundant solution system,designing a multipath suppression algorithm,and combining a fast combination ambiguity fixing method,the impact of ionospheric delay is effectively weakened.Experimental data shows that when the three-base station networking mode is adopted(with a baseline length≤5 km),the planar positioning accuracy can reach±5 mm.This technology has undergone engineering tests in the E6-E8 tube segment area of the Shenzhen-Zhongshan Link immersed tunnel project,successfully overcoming difficulties such as the active ionosphere in low latitudes and multipath interference,achieving high-quality docking of an 80 000-ton immersed tube.It fully verifies its accuracy and reliability in the complex environment of large water areas,providing an innovative solution and practical example for high-precision positioning in offshore engineering.更多还原