一种基于TurboEdit改进的GPS周跳探测与修复方法

Improved cycle slip detection and repair method for GPS receiver based on Turbo Edit algorithm

针对TurboEdit方法的局限性,提出了一种利用TurboEdit改进方法与Legendre多项式检测与修复周跳的新方法。该方法联合利用基于MW组合的BMWA法和考虑电离层残差影响的TECR法来进行周跳检测。在MW组合中采用BMWA方法计算均值代替TurboEdit中利用检测当前历元前全部的数据进行均值计算的方法,大大削弱了观测噪声的影响,并有效提高了算法的实时性;用TECR法取代TurboEdit中的LG组合,有效解决了TurboEdit算法无法应对电离层变化的问题。在检测出周跳后,利用最小二乘Legendre多项式拟合方法解算周跳值进行周跳修复。实验结果表明,该方法能准确探测并修复所有加入的各种模拟周跳,从而有效改善载波相位观测数据质量。

Aiming at the limitations of Turbo Edit method,a new cycle slip detection and repair method using the modified Turbo Edit algorithm and Legendre polynomial is proposed. In the new method,the BMWA algorithm based on Melborne Wubbena combination and the TECR algorithm considering the effects of the ionosphcric residual are combined together to detect the cycle slip. In the Melborne Wubbena combination algorithm,the backward moving window averaging（ BMWA） algorithm is used to calculate the average,which replaces the average calculation method that calculates the overall average by detecting all the data prior to the current epoch in Turbo Edit algorithm. Thereby,the effect of the observation noise is greatly weakened and the real-time performance of the algorithm is improved effectively. Using the TECR method to substitute the LG combination in Turbo Edit algorithm effectively solves the problem that the Turbo Edit algorithm is unable to cope with ionosphere changes. After the cycle slip is detected,the least square Legendre polynomial fitting approach is applied to calculate the cycle slip value and repair the cycle slip. The experiment results show that the proposed algorithm can accurately detect and repair all the simulated cycle slips,therefore effectively improves the quality of carrier phase observation data.