求关于“延迟估计”的英文翻译(中英文都有)，5000字以上

对基于连续运行GPS观测网络的对流层天顶延迟估算模型和参数的选择,及其对估计结果的影响进行研究。在选用相同的对流层改正模型、卫星截止高度角和相同的对流层天顶延迟参数个数的条件下,分段线性方法比分段常数法和单参数方法更能客观反映对流层随时间的变化趋势。在选择相同的天顶延迟模型的条件下,观测时间越长,用于对流层天顶延迟估算的数据越多,对天顶方向的对流层折射估计越有利。天顶延迟参数个数的选择对对流层折射有较大影响。参数过少,则不能充分反映对流层随时间的变化;参数过多,则降低了解的强度。一般对中长基线而言,选择每2～4h一个天顶延迟参数,能较真实地反映对流层的变化,提高基线解的精度。
Continuous operation of GPS-based observation networks zenith tropospheric delay estimation model and parameter selection, and its impact on the estimated results of the study. The same as in the selection of the correct model of the troposphere, the satellite cut-off elevation angle and the same tropospheric zenith delay parameters of the number of conditions, the piecewise linear method of constant score above single-parameter method and more objectively reflect the tropospheric trends over time. In the selection of the same model for zenith delay conditions, the longer observation time for the tropospheric zenith delay data to estimate the more the direction of the zenith tropospheric refraction is estimated that the better. Zenith delay parameters of the choice of the number of refraction of the troposphere has a greater impact. Parameter is too small, it can not fully reflect the troposphere changes over time; parameters too much, then reduce the strength of understanding. Long baseline in general, the choice of 2 ~ 4h per Top 1 days delay parameter can reflect the troposphere field changes, to improve the accuracy of the baseline solution.