A more preciseestimation method of the Zero Doppler Time has been improved, and the frequency synchronization is achieved.
文章改进了零多普勒时间的估计方法，提高了其估计精度，从而较好地实现了频率同步。
2
Preciseestimation of vertical groundwater recharge is important for reasonable estimation and utilization of groundwater resource.
准确计算地下水的垂向入渗补给量是合理评价和利用地下水资源的基础。
3
In the X-Ray angiogram, the preciseestimation of vascular centerlines and widths is very important for the quantitative and visualized diagnosis of blood vessel disease.