顾及收发分置影响的海洋大地基准精密定位方法研究

海洋大地基准是融合了测绘基准与时空服务属性的国家基础设施，具有极为重要的科学研究价值和军事战略意义。本项目围绕海洋大地基准精密定位的收发分置问题，开展系统性的理论研究、模型优化及技术探索。研究具有普适性的高精度收发分置定位声线跟踪方法，解决海洋大地基准深海定位往返声线的准确反演问题；研究构建收发分置单差定位模型以消除残余误差影响，通过信噪比检验和奇异值修正实现单差定位模型的病态机理分析和正则化解算；研究收发分置深度约束定位与深度时序监测方法，开展压强-深度转换精度分析及深度约束定位精度分析，探索基于Argo浮标数据的区域三维温盐压场构建及深度时序监测的可行性。通过开展顾及收发分置的海洋大地基准精密定位方法研究，以期在3000m深度下实现0.3m以内的海洋大地基准定位精度水平（优于深度的0.01%），推动我国自主海洋大地基准的构建与实现。

Marine geodetic datum is a national infrastructure which combines surveying and mapping datum with spatial-temporal service attributes and has extremely important scientific research value and military strategic significance. This project focuses on the transceiver separation problem of precise positioning of marine geodetic datum, and carries out systematic theoretical research, model optimization and technical exploration. By studying the universal and high precision transceiver separation positioning sound ray tracing method, the problem of accurate inversion of sound ray back and forth in deep-sea marine geodetic datum positioning will be solved. In order to eliminate residual systematic errors, a transceiver separation single difference positioning model will be constructed, and the signal to noise ratio test and singular value correction will be used to complete the ill-condition mechanism analysis and regularization resolution. The transceiver separation depth constrained positioning method and depth timing monitoring methods will be studied, pressure-depth conversion accuracy analysis and depth constraint positioning accuracy analysis will be carried out, and the feasibility of time series monitoring depth by constructing a regional three-dimensional temperature, salt and pressure field based on Argo buoy data will be explored. By carrying out the research on precise positioning method of marine geodetic datum considering the transceiver separation, the positioning accuracy of marine geodetic datum within 0.3m at 3000m depth (better than 0.01% of depth) is expected to be achieved, so as to promote the construction and realization of China's independent marine geodetic datum.