这些关键问题主要有姿态改正、GPS高程质量控制、垂直基准转换、基于信号的在航潮位提取。
Some key techniques, such as attitude correction, quality control of GPS height, transformation of vertical reference datum and extraction of tidal level, are studied in detail.
三角高程测量高差值应进行球差改正。
Elevation difference by trigonometric leveling shall be corrected by spherical aberration.
本书对多个示例程序进行了重新编写以改正程序中的问题，其中使用的技术包括：提高程序的一致性、去掉冗余的继承等。
Multiple sample program book has been rewritten to correct problems in the program, which used techniques include: improving the consistency of procedures, remove redundant inheritance.
利用高精度GPS后处理软件GAMIT/GLOBK对厦门集美跨海大桥B级GPS控制网的实测数据进行处理，分析海潮对GPS控制网的影响，指出海潮改正对近海短时间GPS观测高程方向的影响可达数厘米。
By using the after-treatment software GAMIT/GLOBK of high precision GPS, it treats with the observational data of class-B GPS control network for the Xiamen Jimei cross-sea bridge.
利用高精度GPS后处理软件GAMIT/GLOBK对厦门集美跨海大桥B级GPS控制网的实测数据进行处理，分析海潮对GPS控制网的影响，指出海潮改正对近海短时间GPS观测高程方向的影响可达数厘米。
By using the after-treatment software GAMIT/GLOBK of high precision GPS, it treats with the observational data of class-B GPS control network for the Xiamen Jimei cross-sea bridge.
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