铁路安全应用卫星导航信号空间可信区域识别方法

Dependable railway safety application satellite navigation signal in space region identification method

卫星导航系统作为一种信息源,在铁路安全苛求系统中应用时需满足相应的可用性需求.针对铁路遮挡环境下导航卫星空间信号的可用性评估问题,提出了一种基于禁忌搜索的8-邻域区域生长算法,并得出可信的卫星导航信号可用区域.在此基础上,设计了一套铁路导航定位应用环境下的空间信号本地可用性分析方案,并进行了实验验证.结果表明,在所选取的四个场景中,本文所提出的算法能够有效降低将遮挡识别为可见天空的风险,算法将可见天空识别为遮挡的误识率低于6.9%,漏识率低于2.1%,并支持风险等级的进一步降低,为铁路安全苛求系统提供可信的“保守”空间信号可用区域.

Satellite navigation system is one information source,when it’s adopted in safety-critical applications in railways,the availability has to be required.Aiming at solving satellite navigation signal availability issue on the context of railway environment masking,this paper proposes a taboo-based 8-neighbors region growing algorithm,which can assess satellite real a-vailability effectively.Based on the proposed algorithm,a satellite real availability assessment de-vice in railway navigation application environment is designed.The on-site experiments show that,in the selected scenarios,the proposed algorithm is able to reduce the risk of identifying the masking as available sky,the false identification rate is less than 6.9%,meanwhile the missed detection rate of identifying the masking as available sky is better than 2.1%,in addition,it sup-ports to decrease the risk to lower level.It also reveals that the proposed algorithm can provide dependable and conservative space signal availability for railway safety-critical applications.