| 基于GPS PPK技术确定测深点瞬时潮位及分析 |
| Determination and Analysis of the Instantaneous Tide Level of Sounding Point Based on GPS PPK |
| 投稿时间：2019-11-27 修订日期：2020-02-07 |
| DOI： |
| 中文关键词: GPS PPK潮位 潮位改正 潮汐模型 |
| 英文关键词:GPS PPK Tidal Level Tidal Level Correction Tidal Model |
| 基金项目:国家重点研发计划专项项目课题(2016YFC1401210)；国家自然科学基金(41576099)；全球变化与海气相互作用专项(16011G) |
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| 中文摘要: |
| 潮位是影响水下地形测量精度的主要误差之一，获取准确的潮位信息直接关系着潮位改正的正确与否。本文基于GPS PPK技术得到的GPS天线大地高，首先经过垂直基准转换，其次利用推算的姿态改正公式以及利用压力式潮位计获取的动态吃水进行姿态与吃水改正，最后采用小波变换进行波浪滤除得到测深点精密的瞬时潮位。以琼州海峡为试验海区，采用上述方法获得测深点瞬时潮位并与传统潮汐模型推算潮位对比，对比发现两者并不一致，且前一种方法得到的潮位趋势与测船的航向有很强的相关性。通过对测区的潮汐潮流特征进行分析，分析结果与实测结果相符，表明GPS PPK能够获得该区域的潮位并可以反映该区域的潮汐特征。 |
| 英文摘要: |
| Tide level is one of the main errors that affect the accuracy of underwater topographic survey. Accurate tide level information is directly related to the correctness of tide level correction. The ellipsoidal height of GPS antenna obtained based on the GPS PPK technology firstly undergoes vertical reference conversion. Secondly, it uses the estimated attitude correction formula and the dynamic draught obtained by the pressure tide gauge to correct the attitude and draught. Finally, it uses wavelet transform to perform wave filtering to obtain the precise instantaneous tide level at the sounding point.Taking Qiongzhou Strait as the experimental sea area, using the above method to obtain the instantaneous tide level of the sounding point and comparing with the tide level calculated by the traditional tide model, it is found that the two methods are not consistent, and the tide level trend obtained by the former method has a strong correlation with the course of the ship. Through the analysis of tidal current characteristics in the survey area, the analysis results are consistent with the measured results, which shows that GPS PPK can obtain the tide level of the area and reflect the tidal characteristics of the area. |
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