龙羊峡大坝安全监测GNSS解算模型与参数选择研究与应用

Research and Application of GNSS Solution Model and Parameter Selectionfor Safety Monitoring of Longyangxia Dam

通过对龙羊峡大坝GNSS监测数据分析认为,如何确定科学解算参数与解算模型是解决监测误差超限问题的关键。为了进一步提高龙羊峡GNSS监测精度与可靠性,以GNSS基线为研究对象,研究不同观测值采样间隔、对流层模型、电离层模型、载波频率组合等因素对GNSS基线解算精度与可靠性的影响,从而找出最优解算参数与解算策略模型,依据该研究成果在龙羊峡大坝中进行验证。结果表明:采用最优解算参数与解算策略后的GNSS监测数据可靠性较原有解算前有一定提高(之前解算结果规律不明显),同时精度提高约30%~50%。该研究方法对于提高GNSS监测精度提供了一种新的思路,具有一定的创新性、实用性。

Through the analysis of GNSS monitoring data of Longyangxia dam,it is concluded that how to determine the scientific solution parameters and solution model is the key to solve the problem of monitoring error overrun,and the key to further improve the accuracy and reliability of GNSS monitoring in Longyangxia dam.This paper takes GNSS baseline as the research object,studies the influence of different observation sampling interval,troposphere model,ionosphere model,carrier frequency combination and other factors on the accuracy and reliability of GNSS baseline solution,so as to find out the optimal solution parameters and solution strategy model which are used to verify the results in Longyangxia dam.The results show that the reliability of GNSS monitoring data after using the optimal solution parameters and solution strategy is higher than the original solution(the law of the previous solution results is unapparent),and the accuracy is improved by about 30%~50%.This research method provides a new idea for improving the accuracy of GNSS monitoring,which is innovative and practical.