信噪比的GNSS宽巷模糊度单历元固定算法

An algorithm of GNSS wide-lane ambiguity resolution on single epoch with SNR

针对常规GNSS解算模糊度存在的问题,该文提出了一种新的GNSS宽巷模糊度单历元求解算法。利用单历元双频码伪距观测值和载波相位观测值得到双差宽巷模糊度浮点解,将所有浮点宽巷模糊度分别向上、向下取整建立模糊度搜索空间;将模糊度空间中的所有备选组合代入双差宽巷观测方程中进行最小二乘解算,其中单位权中误差最小的组合就是最优的宽巷模糊度组合;然后对最优组合进行正确性检验以确定宽巷模糊度。确定宽巷模糊度后,可以利用宽巷观测值和载波观测值求出基础模糊度整周解。实验表明,该文提出的模糊度固定方法具有较高的成功率和可靠性,静态数据中模糊度固定成功率达到98.84%,动态数据中模糊度固定成功率达到了99.60%。

Aiming at the problem in the conventional GNSS single epoch resulting ambiguity,a new algorithm of GNSS wide-lane ambiguity resolution on single epoch was proposed in this paper.Single epoch dual-frequency code pseudorange observations and carrier phase observations were used to resolute floated wide-lane ambiguity,and the floated wide-lane ambiguity were rounded up and down to establish search space.The all alternative combinations in the search space were substituted into wide-lane observation equation to use the least-squares method to result,and the combinations with the smallest unit weight mean square error was optimal,then to test whether the optimal combination was the right.Experimental results showed that the proposed method of ambiguity resolution could guarantee high success rate and reliability,and the successful rate of ambiguity fixed in static data and dynamic data achieved the percentage of98.84 and 99.60 respectively.