基于载波高斯包络模型的精密单点定位保护级

Protection Level of Precise Point Positioning Based on Carrier Gaussian Envelop Model

针对在精密单点定位完好性评估过程中,使用经验噪声模型包络“厚尾”观测噪声,保护级计算具有保守性的问题,求解一种新的载波噪声分布模型。首先给出精密单点定位中保护级的计算框架,其次利用单个测站100天观测数据获得GPS三频非差组合载波噪声序列,并基于灰狼优化算法求解载波噪声模型参数,最后对两种噪声分布模型的性能进行评估,包括观测噪声的包络情况和保护级计算结果。结果表明,与经验噪声模型相比,所求模型使精密单点定位的垂向和水平保护级分别降低了38.1%和27.1%,提升了完好性监测的可用性。

In the integrity assessment of precise point positioning,the empirical noise model is used to envelop the"thick tail"noise and to calculate the protection level.To solve the problem of conservation,a new phase multipath and noise distribution model was solved.Firstly,the PL calculation framework in precise point positioning was given.Secondly,observation data from a single station in 100 days were used to obtain a GPS triple frequency non-differential combination carrier noise sequence,and the carrier noise model parameters were solved based on the grey wolf optimization algorithm.Finally,the performance of the two noise distribution models was evaluated,including the overbounding of noise and the protection level.The results show that compared with the empirical noise model,the proposed model reduces the vertical and horizontal protection levels of precise point positioning by 38.1%and 27.1%respectively,and improves the availability of integrity monitoring.