共查询到19条相似文献,搜索用时 250 毫秒
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起算点精度对GPS基线解算质量的影响 总被引:1,自引:0,他引:1
基线处理时要求知道一个点的坐标,其精度对GPS基线的解算结果有影响。采用实测数据研究起算点精度对GPS基线解算质量的影响,得出了其影响规律,同时给出了提高起算点精度的方法。 相似文献
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为了评估北斗卫星导航系统(BDS)用于验潮站沉降监测的可靠性和精度,该文利用北海区沿海8个验潮站2022年全年的GPS和BDS观测数据,从基线解标准均方根误差、基线重复性和GPS与BDS基线互差等方面对GPS和BDS解算结果进行对比分析。结果表明,BDS基线解的NRMS值在0.17~0.25之间,GPS基线解的NRMS值在0.18~0.23之间,二者基线解的NRMS值基本相当;GPS基线解的长度和各分量基线重复率平均值要小于BDS,从GNSS网固定误差和比例误差看,GPS和BDS的基线长度重复性精度达到10-9~10-8量级,基线东西和南北分量重复性达到10-9量级,基线垂直分量重复性精度达到10-7~10-8量级。在GPS和BDS基线结果互差方面,GPS解算得到的基线长度均要大于BDS,二者平均差值为10.7 mm;东西分量差值最小,其次是南北分量,垂直分量差异最大,南北分量、东西分量和垂直分量差值平均值分别为-8.5 mm、-3.7 mm和10.6 mm。南北分量、东西分量、垂直分量和基线长度差值平均值最大值分别为23.6 mm、20.9 mm、30.4 mm和22.1 mm。总体... 相似文献
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Three-dimensionalrefinedmodelingofwaterqualityinVictoriaHarbourShenYongming,QiuDahong,A.T.Chwang(ReceivedSeptember12,1996;acc... 相似文献
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选取申请区块内富钴结壳平均厚度、平均品位、矿区面积、平均坡度、平均水深和申请区块中的有效站位数等6个因素作为申请区块优劣性评判的指标,将申请区块的优劣性分为3级,建立了富钴结壳申请区块优劣性的模糊评判方法,并进行了实例研究。评判结果对于进行富钴结壳申请区块的优选提供基础。根据模糊评判结果与资源量大小排序两种区块保留结果中部分申请区块存在不一致,建议在后期对申请区块放弃工作时同时考虑模糊评判结果和资源量大小。研究结果可以为将来富钴结壳申请区块的放弃工作提供技术储备。 相似文献
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A three-dimensional numerical model of hydrodynamics and water quality in Hakata Bay 总被引:1,自引:0,他引:1
The hydrodynamics and water quality in Hakata Bay, Japan, are strongly affected by the seasonal variations in both the gravitational circulation and the stratification in the bay. The three-dimensional hydrodynamics and water quality model has been developed to simulate the long-term transport and fate of pollutants in the system. The model is unique in that it completely integrates the refined modelling of the hydrodynamics, biochemical reactions and the ecosystem in the coastal areas. It is a 3-dimensional segmented model which is capable of resolving mean daily variations in all the parameters relevant to pollution control. It predicts daily fluctuations in the oxygen content at different depths in water throughout the year. It takes into account transport and settling of pollutant particles. It predicts light penetration from computed turbidity variations. It includes interactions between the ecosystem and water quality, through nutrient cycling and photosynthesis. The model has been calibrated well against the data set of historical water quality observations in Hakata Bay. 相似文献
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