Galileo四频数据周跳探测与修复方法

Cycle-slip detection and repair method for Galileo quad-frequency data

针对伽利略卫星导航系统(Galileo)可以提供四频信号的特点,提出一种四频周跳探测与修复方法。首先,按照波长较长、电离层延迟和观测噪声较小的标准,选出具有良好探测性能的周跳探测组合,之后联合三个无几何相位组合和一个无几何无电离层组合进行周跳探测。然后,引入最小二乘模糊度降相关(LAMBDA)算法进行周跳修复,并根据比率(ratio)值进一步验证周跳修复结果的正确性。最后,利用Galileo四频观测数据对本算法的有效性和可靠性进行验证。实验结果表明,本方法可以有效准确地对四频数据进行周跳探测与修复。

Aiming at the characteristic that Galileo navigation satellite system(Galileo)can provide quad-frequency signals,we develop a cycle-slip detection and repair method for quad-frequency observations.Firstly,some proper cycle-slip detection combinations which have great cycle-slip detection performance are selected according to the criteria of longer wavelength,smaller ionospheric delay and observation noise.Three geometry-free phase combinations as well as one geometry-free ionosphere-free combination are combined to detect cycle-slip.Then the Least-square AMbiguity Decorrelation Adjustment(LAMBDA)method is introduced to repair cycle-slip,and the ratio threshold in the LAMBDA method is adopted to further verified the result of cycle-clip repair.At last,Galileo quad-frequency data have been used to validate the effectiveness and reliability of the whole algorithm.The experiment result indicates that the proposed method can effectively and accurately detect and repair cycle-slip of quad-frequency data.