海潮负荷模型在不同地理区域精度对比分析

Comparative analysis of accuracy of ocean tide model in different geographical regions

针对海潮负荷模型在不同地理区域(海岛、沿海、内陆)对定位精度的影响,本文基于中国大陆构造环境监测网络的监测数据,借助GAMIT/GLOBK 10.7软件使用FES2004、CRS4.0海潮模型分别对数据进行解算,对不同地理区域定位结果进行分析。实验结果表明,海潮负荷模型在高精度GNSS定位数据处理中对海岛地区的测站影响最大,对沿海地区的影响次之,对内陆地区的影响可以忽略不计。FES2004模型和CRS4.0模型对海岛、沿海和内陆解算结果较为一致,在海岛地区N、E方向上的偏差为毫米级,在U方向上的偏差为厘米级,在沿海地区N、E、U方向上的偏差均为毫米级,但U方向上影响程度基本是N、E方向上的3倍左右。

Aiming at the influence of ocean tidal load models on positioning accuracy in different geographical areas(islands,coastal areas and inland areas),based on the monitoring data of crustal movement observation network of China,the data of the different geographic regions are analyzed by using GAMIT/GLOBK 10.7 software and FES2004 and CRS4.0 tidal models respectively.The experimental results show that the ocean tide load model has the greatest impact on the stations in the island area,followed by the coastal area,and the impact on the inland area can be ignored in the processing of high-precision GNSS positioning data.The solution results of FES2004 model and CRS4.O model for island,coastal and inland are relatively consistent.The deviation in N and E directions of island area is millimeter scale,the deviation in U direction is centimeter scale,and the deviation in N,E and U directions of coastal area is millimeter scale,but the influence degree in U direction is basically about 3 times that in N and E directions.