2013年度執行情況報告

褚永海+李姍姍+徐新禹+姚宜斌

摘 要：高程基準作為國家重要基礎設施，其現代化的核心是用數字化高程基準模型，取代用高程控制水準網作為國家高程基準的傳統模式，以及實現用衛星定位技術測定海拔高，滿足我國社會經濟快速發展對國家高程基準現代化的迫切需求。項目針對我國高程基準現代化的需求，緊緊圍繞課題的八個任務進行研究：GRACE和GOCE重力衛星數據產品的預處理、全球近海區域衛星測高數據處理、重力場調和分析理論與超高階全球重力場模型的構建、多類重力場信息融合處理理論與高分辨率格網垂線偏差的精密確定方法、高分辨率高精度全球海面高模型的構建、我國厘米級（似）大地水準面模型的構建、全球高程基準與我國高程基準差的確定、陸海高程/深度基準統一計算方法展開研究。在課題實施的第一年度，完成的研究內容成果包括：確定了更適合我國的2160階次的超高階地球重力場模型；初步開展了重力垂線偏差方法的研究，提出了基于重力異常和地形的現代重力邊值問題實用解式的改進模型；基于GOCE觀測數據確定了一個與國際同類模型精度相當的220階次的衛星重力模型GOWHU01S；分析了近海測高數據的誤差，制定了測高數據編輯準則；確定了2′×2′中國近海及鄰海海域平均海平面高模型，精度與國際同類模型相當；采用Stokes-Helmert方法確定了2′×2′中國重力和1985國家高程基準似大地水準面數值模型（CNGG2011），模型全國的精度為12.6 cm；在GRS80框架下，計算了與全球平均海面最佳彌合的大地水準面位常數為，為全球高程基準統一奠定了基礎；對陸海高程基準統一方法開展了研究，搜集到了陸海高程/深度基準所需的驗潮站等觀測資料。此外，項目組成員發表了論文11篇，指導畢業研究生9人，完成年課題第一年度的研究任務與目標。

關鍵詞：高程基準 高程現代化 全球重力場模型 大地水準面

Abstract： As one of the most critical infrastructure of country， the core of height modernization contain two aspects. The first one is to replace the traditional leveling control network using a digital height datum （DHT）. The second one is to measure the altitude using satellite positioning technology based on DHT. It will meet urgent need for modernization of vertical datum during China's social and economic rapid development. In view of the need of height datum modernization， this project will carry on eight research missions： （1）preprocess the GRACE and GOCE gravity satellite data products. （2）preprocess the satellite altimetric data over coastal areas. （3）study the harmonic analysis theory of gravitational field and determine an ultra-high degree global gravity field model. （4）study the fusion theory of various gravity and determine a high resolution gridded vertical deflection.（5）determine a global sea surface model with high-resolution and high precision. （6）determine a centimeter-level geoid model in China.（6）determine the datum difference between chinas local height datum and global datum. （7）unify the datum between Land elevation and sea depth. In the first year， our group of this project finished and achieved the following results： （1）an ultra-high degree （2160） global gravity field model， the best one for china， was determined. （2）An improved model for the deflection of vertical based on gravity anomalies and the terrain gravity boundary value problems was proposed. （3） A satellite gravity model of order 220 （GOWHU01S）， with the similar precision with international model， was obtained. （4）Analyze the error of altimetric data over coastal area and develop the altimetry data editing criteria. （5）An MSS model of 2′×2′（WHU2013CS） was obtained using LSC. （6）An updated 2′×2′digital quasi-geoid model （CNGG2011） for the National Height Datum 1985 of China， with an average accuracy of 0.13m， is computed by using Stokes-Helmert method. （7）A geopotential value was computed and use to unify the local and global height datum. （8）Some methods of height/depth datum unifying were investigated and some data were collected. Moreover， 11 academic papers on this project were published written by this group and 9 graduate student passed their defenses and got their master degree. In a word， our group complete research tasks and objectives in the first year.

Key Words： Height datum； Height modernization； Global gravity model； Geoid

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