span length

Then the problem how to get water vapor can translate into how to get the ambiguity of wide lane,and the ambiguity of wide-lane can be got by double P code.

首先简要介绍实时水汽探测技术的原理,然后采用详细的推算过程将求水汽量转化为求宽巷模糊度的问题,并利用双频P码求出宽巷模糊度。

By using the layer tunneling and side tunneling, this paper changes the ultra-high and ultra-wide roadways into common ones to tunnel for the purpose of increasing the work efficiency and safety coefficient of tunneling.

利用分层分边掘进,将超高超宽巷道变为普通巷道掘进,以提高巷道掘进的工作效率和安全系数。