1.山东科技大学测绘与空间信息学院,山东 青岛,266510
2.中国测绘科学研究院,北京,100830
3.山东理工大学建筑工程学院,山东 淄博,255049
李景森,硕士,主要从事水下定位研究。lijingsen2021@163.com
薛树强,博士,研究员。xuesq@casm.ac.cn
收稿:2024-01-06,
纸质出版:2025-03-05
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李景森,薛树强,肖圳,等.GNSS/A组合观测臂长改正不确定度评估[J].武汉大学学报(信息科学版),2025,50(3):535-544.
LI Jingsen,XUE Shuqiang,XIAO Zhen,et al.Uncertainty Evaluation on Arm Length Correction of GNSS/A Combined Observation[J].Geomatics and Information Science of Wuhan University,2025,50(3):535-544.
李景森,薛树强,肖圳,等.GNSS/A组合观测臂长改正不确定度评估[J].武汉大学学报(信息科学版),2025,50(3):535-544. DOI:10.13203/j.whugis20220673
LI Jingsen,XUE Shuqiang,XIAO Zhen,et al.Uncertainty Evaluation on Arm Length Correction of GNSS/A Combined Observation[J].Geomatics and Information Science of Wuhan University,2025,50(3):535-544. DOI:10.13203/j.whugis20220673
采用GNSS/A组合观测技术进行海底基准传递时,需要将GNSS天线坐标通过臂长参数以及平台姿态观测转换到换能器位置。这种转换既涉及GNSS定位误差的误差传播问题,还涉及臂长误差及姿态测量误差的传播问题,属于典型的非线性误差传播问题。采用基于线性化误差传播的测量不确定度评定与表示方法(the guide to the expression of uncertainty in measurement,GUM)和基于非线性误差传播的蒙特卡洛方法(Monte Carlo method,MCM),开展了换能器不确定度评估研究。结果表明,GUM和MCM整体上具有很好的一致性,但随着非线性强度或臂长误差的增大,两种方法会产生明显差异,此时,建议采用不存在线性化模型误差影响的MCM;换能器不确定度随着臂长长度的增大而增大,随着姿态测量及臂长测量精度的降低而增大;姿态角精度对换能器不确定度影响最小,GNSS定位精度对其影响最大,臂长参数次之。
Objectives
2
When global navigation satellite system/acoustic(GNSS/A) technology is applied in seafloor geodesy
GNSS antenna coordinates are converted to transducer position by arm length parameters and platform attitude observations. The conversion involves not only the error propagation of GNSS positioning error
but also the propagation of arm length error and attitude measurement error
which is a typical nonlinear error propagation problem.
Methods
2
In this paper
both the guide to the expression of uncertainty in measurement (GUM) based on linearized error propagation and Monte Carlo method (MCM) based on nonlinear error propagation are used to evaluate the uncertainty of transducer location.
Results and Conclusions
2
The results show that GUM and MCM have a good consistency on the whole process
but with the increase of nonlinear strength and measurement uncertainty
these two methods have a significant difference. The uncertainty of transducer increases with the increase of arm length
and increases with the decreas of the accuracies of attitude measurement and arm length measurement. It means that the longer the arm length of GNSS/A combined observation
the higher the requirement for attitude measurement accuracy. Attitude measurement uncertainty has the least influence on the uncertainty of transducer location
GNSS positioning uncertainty has the most
and arm length parameter has the secondary.
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