网络RTK流动站整周模糊度的单历元解算

Single-Epoch ambiguity resolution for network RTK rovers

传统网络RTK模糊度解算方法需要多个历元的观测数据,并且要进行周跳的探测和修复,影响模糊度解算的效率。本文提出一种单历元确定网络RTK双差整周模糊度的新方法。首先利用测码伪距观测值和载波相位观测值的单历元数据组成双差联合观测方程,采用改进LABMDA算法进行两步搜索确定GPS双差相位观测值的宽巷模糊度。确定宽巷模糊度后,再用宽巷模糊度值和载波相位观测值组成新的联合观测方程,大大改善了方程的状态,可以准确解算出GPS双差整周模糊度,显著提高了网络RTK整周模糊度固定的效率。

The conventional ambiguity resolution of network RTK needs multi-epoch observations, and must conduct cycle-slip detection and correction. This influences the efficiency of ambiguity resolution. This paper introduced a new method to fix double- difference ambiguity of network RTK. Firstly, the authors used one epoch data of code pseudorange observations and phase observations to form joint observation equations. Then they adopted a modified LAMBDA arithmetic to make two steps searching to fix the wide lane ambiguity of GPS double-difference phase observations. When wide lane ambiguity was fixed, form new joint observation equations with wide lane ambiguity and phase observations were formed. This could improve the state of the equations greatly, fix the GPS doubledifference ambiguity correctly, and enhance the efficiency of network RTK ambiguity resolution remarkably.