一种改进的DME/DME导航台优化算法

Optimized Selection Algorithm for Navigation Station Based on DME/DME Method

航路飞行阶段的导航台选择是区域导航(RNAV)运行的主要环节。在采用DME/DME导航方式的RNAV选台过程中,基于最小定位误差标准差的选择方法是一种传统的选台算法。论文首先分析了基于最小定位误差选择算法在航路飞行阶段的DME台站选择性能,然后针对这种算法中导航台切换频繁的问题,提出了一种改进的DME/DME导航台优选算法,并通过对比两种选台算法在A593航路中的选台结果和导航台切换次数,对区域导航性能进行仿真评估。仿真结果表明,导航台优选算法能够自动选出一对具有更高精度的导航台,并且满足DME/DME区域导航要求,在一定程度上减少了导航台的频繁切换,提高了定位结果的连续性。

Navigation station selection in the route flight phase is the key to the operation of regional navigation(RNAV).In the process of RNAV station selection,the computing method of horizontal positioning error standard deviation is addressed according to DME/DME navigation method,and a navigation station selection algorithm in the route flight phase is proposed based on the minimum horizontal positioning error.Since the frequent switching of DME/DME beacon will lead to the decrease of the positioning accuracy and continuity in this navigation station selection algorithm,an optimized navigation station selection algorithm in RNAV route phase is proposed to avoid the frequent switching of DME/DME beacon.In this paper,we firstly analyze the result of beacon selection in the route flight phase of A593flight course.Then,we compare the beacon selection model of the two algorithm based on MATLAB.Finally,we evaluate the performance of RNAV based on the selected DME/DME beacon.Simulation results demonstrate that,by the proposed optimized algorithm,a pair of more reasonable DME beacon can be elected and match the demand of DME/DME RNAV.Moreover,the continuity of beacon selection algorithm is improved to a certain extent.