民航基于性能的导航(Performance Based Navigation，PBN)对导航系统精度、完好性等指标要求苛刻，针对地形遮挡、电离层异常等引起的可见星数目少、几何分布差等情况，提出一种利用测距机(Distance Measuring Equipment，DME)测距信息补充全球定位系统(Global Positioning System，GPS)数据的融合定位模型。通过不同的加权算法进行定位解算仿真，选择优化的组合导航定位方案。利用赫尔默特方差算法修正权重，并对传统保护限中最大斜率卫星加权计算，改善GPS/DME组合定位的完好性性能。仿真结果表明，赫尔默特方差修正权重的GPS/DME组合导航定位精度高于单独的GPS定位精度，在卫星数目只有3 颗无法满足PBN运行要求时，GPS/DME组合后的精度可以满足PBN的非精密进近的要求，加权后的保护限算法能够满足最小漏警率要求。
Research on GPS/DME Integrated Positioning Algorithm for PBN Operation
The performance-based navigation(PBN)of civil aviation has strict requirements on the accuracy and integrity of the navigation system.In view of certain situations with a small number of visible satellites and poor geo-metric distribution due to terrain occlusion and ionospheric anomalies,a fusion positioning model in which Distance Measuring Equipment(DME)ranging information complements global positioning system(GPS)data is proposed.Different weighting algorithms are used to solve the positioning simulation,and the optimal integrated navigation posi-tioning scheme is selected.The Helmert variance algorithm is used to modify the weights,and weighted to calculate the maximum slope satellite in the traditional protection limit,so as to improve the integrity performance of GPS/DME integrated positioning.The simulation results show that the positioning accuracy of GPS/DME integrated navigation with Helmert variance correction weight is higher than that of GPS alone.When the number of satellites is only three,which cannot meet the operation requirements of PBN,the accuracy of GPS/DME integration can meet the require-ments of PBN′s non-precision approach,and the weighted protection limit algorithm can meet the requirements of the minimum dismissal alarm probability.
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