卫星重力场恢复中海潮负荷效应的改正

发布时间：2019-05-05 06:29

【摘要】：本文详细介绍了海潮负荷效应对卫星重力测量影响的基本理论,并采用不同分辨率的FES2004、TPXO7.2和GOT00全球海潮模型计算了海潮负荷对卫星重力结果前60阶的影响;并用各个模型之间的差异作为海潮模型精度的估计量,计算了海潮模型误差对卫星重力结果的影响,与GRACE恢复的重力场精度的比较说明:海潮负荷效应主要影响卫星重力观测结果的低阶系数,35阶以下的影响都超过了目前重力场恢复精度;尽管由于卫星测高技术的发展,全球海潮模型的分辨率及精度均得到很大提高,但目前的全球海潮模型用于GRACE重力场恢复的前12阶的改正还是不够精确.受近海地区特殊海岸线及复杂海底地形的影响,整体精度仍得不到提高,利用高精度高分辨率的中国近海模型对不同分辨率全球海潮模型进行局部精化,进一步提高了全球海潮模型的整体精度,同时改善了卫星重力场恢复中的海潮负荷改正效果.
[Abstract]:In this paper, the basic theory of the effect of ocean tide load on satellite gravity survey is introduced in detail, and the influence of ocean tide load on the first 60 order of satellite gravity results is calculated by using FES2004,TPXO7.2 and GOT00 global tide models with different resolutions. Using the difference of each model as the estimation of the accuracy of the ocean tide model, the influence of the ocean tide model error on the satellite gravity results is calculated. The comparison with the precision of gravity field recovered by GRACE shows that the sea tide load effect mainly affects the low order coefficient of satellite gravity observation results, and the influence below 35 order exceeds the accuracy of gravity field restoration at present. Because of the development of satellite altimetry technology, the resolution and precision of global ocean tide model have been greatly improved, but the current global ocean tide model is not accurate enough to correct the first 12 orders of GRACE gravity field recovery. Affected by the special coastline and complex seabed topography in the offshore area, the overall accuracy is still not improved, and the global tidal models with different resolutions are locally refined by using the high-precision and high-resolution Chinese offshore model. The whole accuracy of the global ocean tide model is further improved, and the correction effect of ocean tide load in satellite gravity field recovery is also improved.
【作者单位】：国家测绘地理信息局大地测量数据处理中心;长安大学;机械工业勘察设计研究院有限公司;
【基金】：国家自然科学基金项目(4157040313,41774004)资助
【分类号】：P223

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