| In the process of the traditional survey control network establishing, because of many restrictions, conventional means of control measurements are often used, that is, to create angle-measuring network , measuring network side or net corner through the theodolite, range finder, Total Station, Level Measuring Equipment, etc.. With heavy workload and long operating time, these conventional means are also influenced by the climate and environmental conditions significantly. With the rapid development of the national economic construction, "to the ocean to space, to the ocean to industry, to the ocean to GDP", resulting in a large number of water projects, particularly in waterways like the Yangtze River estuary management projects such as large-scale water projects, which have also been emerged. But for water projects, it is extremely difficult by using traditional measurement methods to lay control network directly because of the difficulties from resources, environment, and customs. Therefore, to study a suitable and high-precision control survey method for a water project construction is necessary, and meanwhile the development of GPS technology provides possible solutions to such problems.This paper mainly firstly introduces the Yangtze River estuary channel GPS control network deployment, and then how to make use of GPS technology to create a water control network, finally GPS system errors in the process of laying the water control network and carrying out the corresponding analysis; meanwhile, this paper focuses on analyzing the data collecting and processing combined with the scientific analysis software GAMIT, such study content and results are included: water control network engineering design, observations of GPS systems, data acquisition, data formats and conversions, the baseline and the net adjustment calculation. Finally, by analyzing some project application examples, this paper demonstrates the research results and further direction to study. |
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